Saqib Ali - Academia.edu (original) (raw)

Papers by Saqib Ali

Acta Crystallographica Section E-structure Reports Online, 2007

ABSTRACT

Multi-Input Multi-Output (MIMO) has emerged as a hot topic in wireless communications during the ... more Multi-Input Multi-Output (MIMO) has emerged as a hot topic in wireless communications during the last decade. This is due to possible dramatic increases in reliability and capacity as compared to single-antenna solutions. However, much of the existing theoretical results are based on very simplistic models of the antennas and transciever circuitry. Within the Strategic Research Center on Atenna Systems Charmant at Chalmers, we are developing a systems simulator for making more realistic studies of MIMO systems. Models of different complexity can be used for the different components. For the linear components, S-parameters are used as the interface. These can come from theoretical models, electromagnetic field simulations, or directly from measurements. For the non-linear components, simple memoryless models can be used, as existing in the RF Toolbox. However, wideband applications demand more elaborate models. We have implemented a so-called memory polynomial model, which has been found to match measurements of nonlinear wideband power amplifiers well. Since RF Toolbox cannot handle multi-port scattering matrices (yet), the MIMO part is here computed in a Matlab function, and then implemented as a MIMO transfer function. The paper describes an implementation of a transciever chain including mixers, filters, PA/LNA, matching network, MIMO antennas and channel models. The simulator can be used for a wide range of wireless communication applications.

[

Journal of Organometallic Chemistry, 2005

Nine organotin esters, Me 2 SnL 2 1, Me 3 SnL 2, n-Bu 2 SnL 2 3, n-Bu 3 SnL 4, Ph 3 SnL 5, (PhCH ... more Nine organotin esters, Me 2 SnL 2 1, Me 3 SnL 2, n-Bu 2 SnL 2 3, n-Bu 3 SnL 4, Ph 3 SnL 5, (PhCH 2 ) 2 SnL 2 6, [(Me 2 SnL) 2 O] 2 7, Et 2 SnL 2 8 and n-Oct 2 SnL 2 9, of (E)-3-(3-fluorophenyl)-2-(4-chlorophenyl)-2-propenoic acid, HL have been synthesized and characterized by elemental analysis, IR, Multinuclear NMR ( 1 H, 13 C and 119 Sn) and mass spectrometry. The geometry around the tin atom has been deduced and compared both in solution and solid states. The crystal structure of compound 5 has been determined by X-ray single crystal analysis, which shows a tetrahedral geometry around the tin atom with space group P 1. These compounds have also been screened for bactericidal, fungicidal activities and cytotoxicity data.

Journal of Organometallic Chemistry, 2003

Alkyn-1-yl(methyl)silanes Me 2 (H)Si Á/C Å/C Á/R (1), Me(H)(Cl)Si Á/CÅ/C Á/R (2) and Me 2 (Cl)Si ... more Alkyn-1-yl(methyl)silanes Me 2 (H)Si Á/C Å/C Á/R (1), Me(H)(Cl)Si Á/CÅ/C Á/R (2) and Me 2 (Cl)Si Á/CÅ/C Á/R (3) [R0/Bu (a), t Bu (b), Ph (c), SiMe 3 (d)] react with 9-borabicyclo[3.3.1]nonane (9-BBN) by 1,2-cis -hydroboration to give selectively (except of 3d) the alkenylsilanes 4 (from 1), 5 (from 2), and 6 (from 3), in which the boryl group has become attached to the carbon atom adjacent to the silyl group bearing functional substituents. In the case of 3d, a mixture consisting of the alkenes 6d and the isomers 7d, 8d and 9d is obtained. All products were characterised by NMR spectra ( 1 H-, 11 B-, 13 C-and 29 Si-NMR) in solution, and in the cases of 5c and 6c, the molecular structures in the solid state were determined by X-ray analysis. #

Synthesis and Reactivity in Inorganic and Metal-organic Chemistry, 2002

Synthesis and Reactivity in Inorganic and Metal-organic Chemistry, 1997

Abstract The synthesis of a new series of organotin carboxylates of 2-(2, 3-dimethylphenyl) amino... more Abstract The synthesis of a new series of organotin carboxylates of 2-(2, 3-dimethylphenyl) aminobenzoic acid is reported. Multinuclear NMR (1H, 13C, 119Sn) data have been used as a tool for determining their structures in non-coordinating solvents. Solid state structures ...

[

Heteroatom Chemistry, 2002

Eight tri- and diorganotin(IV) carboxylates with general formulae R3SnL and R2SnL2 (where R = CH3... more Eight tri- and diorganotin(IV) carboxylates with general formulae R3SnL and R2SnL2 (where R = CH3, n-C4H9, C6H5, C7H7, and L = 2′,4′-difluoro-4-hydroxy-[1,1′]-biphenyl-3-carboxylic acid) were synthesized and characterized by UV–vis, IR, conductance, multinuclear (1H, 13C, and 119Sn) NMR spectroscopy, and mass spectrometry. The crystal structure of [(CH3)3Sn(C13H7O3F2)] indicates that the tin atom in the asymmetric unit exists in a trigonal bipyramidal geometry having a space group Pbca with an orthorhombic crystal system. These complexes were also screened for their antibacterial and antifungal activities. © 2002 Wiley Periodicals, Inc. Heteroatom Chem 13:638–649, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/hc.10057

Journal of Organometallic Chemistry, 2006

Chloro-diorganotin(IV) complexes of 4-methyl-1-piperidine carbodithioic acid (4-MePCDTA) have bee... more Chloro-diorganotin(IV) complexes of 4-methyl-1-piperidine carbodithioic acid (4-MePCDTA) have been synthesized by the reaction with diorganotin dichloride in 1:1 molar ratio in anhydrous toluene. These newly synthesized complexes have been characterized by elemental, IR, multinuclear NMR ( 1 H and 13 C) and mass spectrometric studies. The crystal structures of complex 1 [Me 2 SnCl(4-MePCDT)] and 3 [Ph 2 SnCl(4-MePCDT)] have been determined by X-ray single crystal analysis, which show trigonal bipyramid geometry. These complexes were tested for their antimicrobial activity against six different plant and human pathogens. The screening results show that the complexes exhibit higher antibacterial and antifungal activity than the free ligand.

Synthesis and Reactivity in Inorganic and Metal-organic Chemistry, 2003

In the past three decades the chemistry of tin compounds has gained considerable importance, both... more In the past three decades the chemistry of tin compounds has gained considerable importance, both in basic research and in industrial applications. There are many interesting aspects of inorganic and organic tin chem-istry discussed in various reviews2. Organotin ...

[

Synthesis and Reactivity in Inorganic and Metal-organic Chemistry, 2002

A series of tri-and diorganotin(IV) complexes of the general formula R 4Àn SnL n (where R CH 3 , ... more A series of tri-and diorganotin(IV) complexes of the general formula R 4Àn SnL n (where R CH 3 , C 4 H 9 , C 6 H 6 , C 7 H 7 , n 1, 2 and HL 5-benzoyl-a-methyl-2-thiopheneacetic acid) have been sythesized by the reaction of tri-and diorganotin-

Acta Crystallographica Section E-structure Reports Online, 2008

Key indicators: single-crystal X-ray study; T = 296 K; mean (C-C) = 0.003 Å; R factor = 0.050; wR... more Key indicators: single-crystal X-ray study; T = 296 K; mean (C-C) = 0.003 Å; R factor = 0.050; wR factor = 0.165; data-to-parameter ratio = 22.8.

Acta Crystallographica Section C-crystal Structure Communications, 1997

Applied Organometallic Chemistry, 1997

Reaction of 1-phenyl-3-methyl-4-benzoyl-pyrazol-5-one and benzoyl hydrazide in refluxing ethanol ... more Reaction of 1-phenyl-3-methyl-4-benzoyl-pyrazol-5-one and benzoyl hydrazide in refluxing ethanol gave N -[(Z)-(3-methyl-5-oxo-1-phenyl-1,5-dihydro-4H-pyrazol-4-ylidene)(phenyl)methyl]benzohydrazide (HL 1 ), which was characterized by NMR spectroscopy and single-crystal X-ray structure study. X-ray diffraction analyses of the crystals revealed a nonplanar molecule, existing in the keto-amine form, with intermolecular hydrogen bonding forming a seven-membered ring system. The reaction of HL 1 with Co(II), Ni(II), and Cu(II) halides gave the corresponding complexes, which were characterized by elemental analysis, molar conductance, magnetic measurements, and infrared and electronic spectral studies. The compounds were screened for their in vitro cytotoxic activity against HL-60 human promyelocytic leukemia cells and antimicrobial activity against some bacteria and yeasts. Results showed that the compounds are potent against HL-60 cells with the IC 50 value ≤5 M, while some of the compounds were active against few studied Gram-positive bacteria.

Applied Organometallic Chemistry, 2005

Me2Sn(S2CN(CH2)5)Cl contains five-coordinated tin with a bidentate dithiocarbamate ligand spannin... more Me2Sn(S2CN(CH2)5)Cl contains five-coordinated tin with a bidentate dithiocarbamate ligand spanning equatorial and axial positions in a distorted trigonal bipyramidal geometry. Copyright © 2005 John Wiley & Sons, Ltd.

Synthesis and Reactivity in Inorganic and Metal-organic Chemistry, 1994

A series of oraanotin(1V) complexes of the general formula R3SnL ( R = CH3. CZH5. "-C4H,. CeHll. ... more A series of oraanotin(1V) complexes of the general formula R3SnL ( R = CH3. CZH5. "-C4H,. CeHll. CbH5) RzSnLz prepared by treating the silver salt of 3-(2-thienyl)-Z-vrouenoic acid (2-thiouheneacrvlic acid) with the respective tri-and diogranotin(1V) chlorides in (1:l) and ( 2 : l ) molar ratio and characterized by elemental analyses. IR. 'H nmr and mass spectrometry. and J . Am. Chem. S o c . . 107, 4546 ( 1 9 8 5 ) . T . P . Lockhart and W . F. Handers, I n o r g . 892 ( 1 9 8 6 ) .

Journal of Organometallic Chemistry, 1995

Multinuclear NMR and Mössbauer spectroscopy have been carried out for d-and triorganotin carboxyl... more Multinuclear NMR and Mössbauer spectroscopy have been carried out for d-and triorganotin carboxylates derived from 3-(-2-furanyl)-2-propenoic acid. Their spectroscopic characterization showd that triorganotin carboxylates are either 4-coordinate monomers or 5-coordinate ...

Applied Organometallic Chemistry, 2003

The reaction of di(alkyn-1-yl)silanes Me(R)Si(CCtBu)2 [1; R = Me (a), H (b)] with diethylborane o... more The reaction of di(alkyn-1-yl)silanes Me(R)Si(CCtBu)2 [1; R = Me (a), H (b)] with diethylborane or 9-borabicyclo[3.3.1]nonane in a 1 : 1 ratio affords the 1-silacyclobutene derivatives 6a, 7a,b as a result of intermolecular 1,1-hydroboration followed by intramolecular 1,1-organoboration. Intermediates, in which both an alkenyl and an alkynyl group are linked to silicon (2a, 3a), were identified and prepared independently by the reaction of the corresponding chlorosilane 5a with the lithium alkynide LiCCtBu. This procedure also opened the way to a stepwise synthesis of 1-silacyclobutenes with a choice of substituents in the 2,4-positions (6b and 9a). All reactions were monitored by 29Si NMR spectroscopy, and the structural assignment of the final products was based on multinuclear magnetic resonance data (1H, 11B, 13C and 29Si NMR). Copyright © 2003 John Wiley & Sons, Ltd.

Applied Organometallic Chemistry, 2005

A trigonal bipyramidal C2ClS2 coordination geometry for tin is found in Ph2Sn(S2CN(CH2)5)Cl. Copy... more A trigonal bipyramidal C2ClS2 coordination geometry for tin is found in Ph2Sn(S2CN(CH2)5)Cl. Copyright © 2005 John Wiley & Sons, Ltd.

Synthesis and Reactivity in Inorganic and Metal-organic Chemistry, 2002

Complexes of the composition R4-nSnLn (R=Me, Et, Bu, Ph, Bz, n=1 and 2, and L=2-(6-methoxynaphthy... more Complexes of the composition R4-nSnLn (R=Me, Et, Bu, Ph, Bz, n=1 and 2, and L=2-(6-methoxynaphthyl)propionic acid anion have been synthesized by the reaction of tri- and diorganotin halides with the silver salt of 2-(6-methoxynaphthyl)propionic acid in dry chloroform. Conductance data show that the complexes are non-electrolytes. Structural assignments were made on the basis of spectral studies (FTIR, H, C, Sn

Applied Organometallic Chemistry, 1997

Reaction of 1-phenyl-3-methyl-4-benzoyl-pyrazol-5-one and benzoyl hydrazide in refluxing ethanol ... more Reaction of 1-phenyl-3-methyl-4-benzoyl-pyrazol-5-one and benzoyl hydrazide in refluxing ethanol gave N -[(Z)-(3-methyl-5-oxo-1-phenyl-1,5-dihydro-4H-pyrazol-4-ylidene)(phenyl)methyl]benzohydrazide (HL 1 ), which was characterized by NMR spectroscopy and single-crystal X-ray structure study. X-ray diffraction analyses of the crystals revealed a nonplanar molecule, existing in the keto-amine form, with intermolecular hydrogen bonding forming a seven-membered ring system. The reaction of HL 1 with Co(II), Ni(II), and Cu(II) halides gave the corresponding complexes, which were characterized by elemental analysis, molar conductance, magnetic measurements, and infrared and electronic spectral studies. The compounds were screened for their in vitro cytotoxic activity against HL-60 human promyelocytic leukemia cells and antimicrobial activity against some bacteria and yeasts. Results showed that the compounds are potent against HL-60 cells with the IC 50 value ≤5 M, while some of the compounds were active against few studied Gram-positive bacteria.

Acta Crystallographica Section E-structure Reports Online, 2007

ABSTRACT

Multi-Input Multi-Output (MIMO) has emerged as a hot topic in wireless communications during the ... more Multi-Input Multi-Output (MIMO) has emerged as a hot topic in wireless communications during the last decade. This is due to possible dramatic increases in reliability and capacity as compared to single-antenna solutions. However, much of the existing theoretical results are based on very simplistic models of the antennas and transciever circuitry. Within the Strategic Research Center on Atenna Systems Charmant at Chalmers, we are developing a systems simulator for making more realistic studies of MIMO systems. Models of different complexity can be used for the different components. For the linear components, S-parameters are used as the interface. These can come from theoretical models, electromagnetic field simulations, or directly from measurements. For the non-linear components, simple memoryless models can be used, as existing in the RF Toolbox. However, wideband applications demand more elaborate models. We have implemented a so-called memory polynomial model, which has been found to match measurements of nonlinear wideband power amplifiers well. Since RF Toolbox cannot handle multi-port scattering matrices (yet), the MIMO part is here computed in a Matlab function, and then implemented as a MIMO transfer function. The paper describes an implementation of a transciever chain including mixers, filters, PA/LNA, matching network, MIMO antennas and channel models. The simulator can be used for a wide range of wireless communication applications.

[

Journal of Organometallic Chemistry, 2005

Nine organotin esters, Me 2 SnL 2 1, Me 3 SnL 2, n-Bu 2 SnL 2 3, n-Bu 3 SnL 4, Ph 3 SnL 5, (PhCH ... more Nine organotin esters, Me 2 SnL 2 1, Me 3 SnL 2, n-Bu 2 SnL 2 3, n-Bu 3 SnL 4, Ph 3 SnL 5, (PhCH 2 ) 2 SnL 2 6, [(Me 2 SnL) 2 O] 2 7, Et 2 SnL 2 8 and n-Oct 2 SnL 2 9, of (E)-3-(3-fluorophenyl)-2-(4-chlorophenyl)-2-propenoic acid, HL have been synthesized and characterized by elemental analysis, IR, Multinuclear NMR ( 1 H, 13 C and 119 Sn) and mass spectrometry. The geometry around the tin atom has been deduced and compared both in solution and solid states. The crystal structure of compound 5 has been determined by X-ray single crystal analysis, which shows a tetrahedral geometry around the tin atom with space group P 1. These compounds have also been screened for bactericidal, fungicidal activities and cytotoxicity data.

Journal of Organometallic Chemistry, 2003

Alkyn-1-yl(methyl)silanes Me 2 (H)Si Á/C Å/C Á/R (1), Me(H)(Cl)Si Á/CÅ/C Á/R (2) and Me 2 (Cl)Si ... more Alkyn-1-yl(methyl)silanes Me 2 (H)Si Á/C Å/C Á/R (1), Me(H)(Cl)Si Á/CÅ/C Á/R (2) and Me 2 (Cl)Si Á/CÅ/C Á/R (3) [R0/Bu (a), t Bu (b), Ph (c), SiMe 3 (d)] react with 9-borabicyclo[3.3.1]nonane (9-BBN) by 1,2-cis -hydroboration to give selectively (except of 3d) the alkenylsilanes 4 (from 1), 5 (from 2), and 6 (from 3), in which the boryl group has become attached to the carbon atom adjacent to the silyl group bearing functional substituents. In the case of 3d, a mixture consisting of the alkenes 6d and the isomers 7d, 8d and 9d is obtained. All products were characterised by NMR spectra ( 1 H-, 11 B-, 13 C-and 29 Si-NMR) in solution, and in the cases of 5c and 6c, the molecular structures in the solid state were determined by X-ray analysis. #

Synthesis and Reactivity in Inorganic and Metal-organic Chemistry, 2002

Synthesis and Reactivity in Inorganic and Metal-organic Chemistry, 1997

Abstract The synthesis of a new series of organotin carboxylates of 2-(2, 3-dimethylphenyl) amino... more Abstract The synthesis of a new series of organotin carboxylates of 2-(2, 3-dimethylphenyl) aminobenzoic acid is reported. Multinuclear NMR (1H, 13C, 119Sn) data have been used as a tool for determining their structures in non-coordinating solvents. Solid state structures ...

[

Heteroatom Chemistry, 2002

Eight tri- and diorganotin(IV) carboxylates with general formulae R3SnL and R2SnL2 (where R = CH3... more Eight tri- and diorganotin(IV) carboxylates with general formulae R3SnL and R2SnL2 (where R = CH3, n-C4H9, C6H5, C7H7, and L = 2′,4′-difluoro-4-hydroxy-[1,1′]-biphenyl-3-carboxylic acid) were synthesized and characterized by UV–vis, IR, conductance, multinuclear (1H, 13C, and 119Sn) NMR spectroscopy, and mass spectrometry. The crystal structure of [(CH3)3Sn(C13H7O3F2)] indicates that the tin atom in the asymmetric unit exists in a trigonal bipyramidal geometry having a space group Pbca with an orthorhombic crystal system. These complexes were also screened for their antibacterial and antifungal activities. © 2002 Wiley Periodicals, Inc. Heteroatom Chem 13:638–649, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/hc.10057

Journal of Organometallic Chemistry, 2006

Chloro-diorganotin(IV) complexes of 4-methyl-1-piperidine carbodithioic acid (4-MePCDTA) have bee... more Chloro-diorganotin(IV) complexes of 4-methyl-1-piperidine carbodithioic acid (4-MePCDTA) have been synthesized by the reaction with diorganotin dichloride in 1:1 molar ratio in anhydrous toluene. These newly synthesized complexes have been characterized by elemental, IR, multinuclear NMR ( 1 H and 13 C) and mass spectrometric studies. The crystal structures of complex 1 [Me 2 SnCl(4-MePCDT)] and 3 [Ph 2 SnCl(4-MePCDT)] have been determined by X-ray single crystal analysis, which show trigonal bipyramid geometry. These complexes were tested for their antimicrobial activity against six different plant and human pathogens. The screening results show that the complexes exhibit higher antibacterial and antifungal activity than the free ligand.

Synthesis and Reactivity in Inorganic and Metal-organic Chemistry, 2003

In the past three decades the chemistry of tin compounds has gained considerable importance, both... more In the past three decades the chemistry of tin compounds has gained considerable importance, both in basic research and in industrial applications. There are many interesting aspects of inorganic and organic tin chem-istry discussed in various reviews2. Organotin ...

[

Synthesis and Reactivity in Inorganic and Metal-organic Chemistry, 2002

A series of tri-and diorganotin(IV) complexes of the general formula R 4Àn SnL n (where R CH 3 , ... more A series of tri-and diorganotin(IV) complexes of the general formula R 4Àn SnL n (where R CH 3 , C 4 H 9 , C 6 H 6 , C 7 H 7 , n 1, 2 and HL 5-benzoyl-a-methyl-2-thiopheneacetic acid) have been sythesized by the reaction of tri-and diorganotin-

Acta Crystallographica Section E-structure Reports Online, 2008

Key indicators: single-crystal X-ray study; T = 296 K; mean (C-C) = 0.003 Å; R factor = 0.050; wR... more Key indicators: single-crystal X-ray study; T = 296 K; mean (C-C) = 0.003 Å; R factor = 0.050; wR factor = 0.165; data-to-parameter ratio = 22.8.

Acta Crystallographica Section C-crystal Structure Communications, 1997

Applied Organometallic Chemistry, 1997

Reaction of 1-phenyl-3-methyl-4-benzoyl-pyrazol-5-one and benzoyl hydrazide in refluxing ethanol ... more Reaction of 1-phenyl-3-methyl-4-benzoyl-pyrazol-5-one and benzoyl hydrazide in refluxing ethanol gave N -[(Z)-(3-methyl-5-oxo-1-phenyl-1,5-dihydro-4H-pyrazol-4-ylidene)(phenyl)methyl]benzohydrazide (HL 1 ), which was characterized by NMR spectroscopy and single-crystal X-ray structure study. X-ray diffraction analyses of the crystals revealed a nonplanar molecule, existing in the keto-amine form, with intermolecular hydrogen bonding forming a seven-membered ring system. The reaction of HL 1 with Co(II), Ni(II), and Cu(II) halides gave the corresponding complexes, which were characterized by elemental analysis, molar conductance, magnetic measurements, and infrared and electronic spectral studies. The compounds were screened for their in vitro cytotoxic activity against HL-60 human promyelocytic leukemia cells and antimicrobial activity against some bacteria and yeasts. Results showed that the compounds are potent against HL-60 cells with the IC 50 value ≤5 M, while some of the compounds were active against few studied Gram-positive bacteria.

Applied Organometallic Chemistry, 2005

Me2Sn(S2CN(CH2)5)Cl contains five-coordinated tin with a bidentate dithiocarbamate ligand spannin... more Me2Sn(S2CN(CH2)5)Cl contains five-coordinated tin with a bidentate dithiocarbamate ligand spanning equatorial and axial positions in a distorted trigonal bipyramidal geometry. Copyright © 2005 John Wiley & Sons, Ltd.

Synthesis and Reactivity in Inorganic and Metal-organic Chemistry, 1994

A series of oraanotin(1V) complexes of the general formula R3SnL ( R = CH3. CZH5. "-C4H,. CeHll. ... more A series of oraanotin(1V) complexes of the general formula R3SnL ( R = CH3. CZH5. "-C4H,. CeHll. CbH5) RzSnLz prepared by treating the silver salt of 3-(2-thienyl)-Z-vrouenoic acid (2-thiouheneacrvlic acid) with the respective tri-and diogranotin(1V) chlorides in (1:l) and ( 2 : l ) molar ratio and characterized by elemental analyses. IR. 'H nmr and mass spectrometry. and J . Am. Chem. S o c . . 107, 4546 ( 1 9 8 5 ) . T . P . Lockhart and W . F. Handers, I n o r g . 892 ( 1 9 8 6 ) .

Journal of Organometallic Chemistry, 1995

Multinuclear NMR and Mössbauer spectroscopy have been carried out for d-and triorganotin carboxyl... more Multinuclear NMR and Mössbauer spectroscopy have been carried out for d-and triorganotin carboxylates derived from 3-(-2-furanyl)-2-propenoic acid. Their spectroscopic characterization showd that triorganotin carboxylates are either 4-coordinate monomers or 5-coordinate ...

Applied Organometallic Chemistry, 2003

The reaction of di(alkyn-1-yl)silanes Me(R)Si(CCtBu)2 [1; R = Me (a), H (b)] with diethylborane o... more The reaction of di(alkyn-1-yl)silanes Me(R)Si(CCtBu)2 [1; R = Me (a), H (b)] with diethylborane or 9-borabicyclo[3.3.1]nonane in a 1 : 1 ratio affords the 1-silacyclobutene derivatives 6a, 7a,b as a result of intermolecular 1,1-hydroboration followed by intramolecular 1,1-organoboration. Intermediates, in which both an alkenyl and an alkynyl group are linked to silicon (2a, 3a), were identified and prepared independently by the reaction of the corresponding chlorosilane 5a with the lithium alkynide LiCCtBu. This procedure also opened the way to a stepwise synthesis of 1-silacyclobutenes with a choice of substituents in the 2,4-positions (6b and 9a). All reactions were monitored by 29Si NMR spectroscopy, and the structural assignment of the final products was based on multinuclear magnetic resonance data (1H, 11B, 13C and 29Si NMR). Copyright © 2003 John Wiley & Sons, Ltd.

Applied Organometallic Chemistry, 2005

A trigonal bipyramidal C2ClS2 coordination geometry for tin is found in Ph2Sn(S2CN(CH2)5)Cl. Copy... more A trigonal bipyramidal C2ClS2 coordination geometry for tin is found in Ph2Sn(S2CN(CH2)5)Cl. Copyright © 2005 John Wiley & Sons, Ltd.

Synthesis and Reactivity in Inorganic and Metal-organic Chemistry, 2002

Complexes of the composition R4-nSnLn (R=Me, Et, Bu, Ph, Bz, n=1 and 2, and L=2-(6-methoxynaphthy... more Complexes of the composition R4-nSnLn (R=Me, Et, Bu, Ph, Bz, n=1 and 2, and L=2-(6-methoxynaphthyl)propionic acid anion have been synthesized by the reaction of tri- and diorganotin halides with the silver salt of 2-(6-methoxynaphthyl)propionic acid in dry chloroform. Conductance data show that the complexes are non-electrolytes. Structural assignments were made on the basis of spectral studies (FTIR, H, C, Sn

Applied Organometallic Chemistry, 1997

Reaction of 1-phenyl-3-methyl-4-benzoyl-pyrazol-5-one and benzoyl hydrazide in refluxing ethanol ... more Reaction of 1-phenyl-3-methyl-4-benzoyl-pyrazol-5-one and benzoyl hydrazide in refluxing ethanol gave N -[(Z)-(3-methyl-5-oxo-1-phenyl-1,5-dihydro-4H-pyrazol-4-ylidene)(phenyl)methyl]benzohydrazide (HL 1 ), which was characterized by NMR spectroscopy and single-crystal X-ray structure study. X-ray diffraction analyses of the crystals revealed a nonplanar molecule, existing in the keto-amine form, with intermolecular hydrogen bonding forming a seven-membered ring system. The reaction of HL 1 with Co(II), Ni(II), and Cu(II) halides gave the corresponding complexes, which were characterized by elemental analysis, molar conductance, magnetic measurements, and infrared and electronic spectral studies. The compounds were screened for their in vitro cytotoxic activity against HL-60 human promyelocytic leukemia cells and antimicrobial activity against some bacteria and yeasts. Results showed that the compounds are potent against HL-60 cells with the IC 50 value ≤5 M, while some of the compounds were active against few studied Gram-positive bacteria.