Susanna Jansat - Academia.edu (original) (raw)
Papers by Susanna Jansat
![Research paper thumbnail of [Ru(0)]@SiO2and [RuO2]@SiO2Hybrid Nanomaterials: From Their Synthesis to Their Application as Catalytic Filters for Gas Sensors](https://attachments.academia-assets.com/98239027/thumbnails/1.jpg)
](Advanced Functional Materials, 2009
Emulating natural dynamism distributing earth minerals using diffusion and gravity, herein it is ... more Emulating natural dynamism distributing earth minerals using diffusion and gravity, herein it is reported a strategy to unite nanostructured materials of similar size but intrinsic physical repellence, magnetite guest bestowed with C18 alkyl chain ligands and highly hydrophilic ammonium dawsonite NH4Al(OH)2CO3 host, based in electromagnetic and chemical forces. Notwithstanding augmented polarity of nanostructured surface’s carrier, has been used as fine-tuning tool in conjunction with continuum, for triggering a disseminated array of specific interactions covering entire carrier NH4+-RDW-NP periphery. Strong interactions heighten enthalpic contributions balancing unfavourable entropic penalty. Shelter adsorbs diffused guest like conventional Fe3O4-NP dispersions but additionally, whether restricts void’s access or, sinters carrier enabling isolation of a second morphology where magnetite is quantitatively embedded into cavities left between agglomerates. Reported deposition protocol...
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
Journal of the American Chemical Society
We present the synthesis and characterization of the K intercalated rubrene (CH) phase, KRubrene ... more We present the synthesis and characterization of the K intercalated rubrene (CH) phase, KRubrene (KR) and identify the co-existence of amorphous and crystalline materials in samples where the crystalline component is phase pure. We suggest this is characteristic of many intercalated alkali metal-polyaromatic hydrocarbon (PAH) systems, including those for which superconductivity has been claimed. The systematic investigation of K-rubrene solid state reactions using both K and KH sources reveals complex competition between K intercalation and the decomposition of rubrene, producing three K-intercalated compounds, namely, KR, K(RR*), and KR' (where R* and R' are rubrene decomposition derivatives CH and CH, respectively). KR is obtained as the major phase over a wide composition range and is accompanied by the formation of amorphous by-products from the decomposition of rubrene. K(RR*) is synthesized as a single phase and KR' is obtained only as a secondary phase to the majority KR phase. The crystal structure of KR was determined using high resolution powder X-ray diffraction, revealing that the structural rearrangement from pristine rubrene creates two large voids per rubrene within the molecular layers in which K is incorporated. K cations accommodated within the large voids interact strongly with the neighbouring rubrene via η, η and η binding modes to the tetracene cores and the phenyl groups. This contrasts with other intercalated PAHs where only a single void per PAH is created and the intercalated K weakly interact with the host. The decomposition products of rubrene are also examined using solution NMR, highlighting the role of the breaking of C-C bonds. For the crystalline decomposition derivative products K(RR*) and KR', a lack of definitive structural information with regards to R* and R' prevents the crystal structures being determined. The study illustrates the complexity in accessing solvent-free alkali metal salts of reduced PAH of the type claimed to afford superconductivity.
ABSTRACT The invention relates to novel hybrid nanomaterials the prepn. and the use thereof as ca... more ABSTRACT The invention relates to novel hybrid nanomaterials the prepn. and the use thereof as catalytic filters for gas sensors. The new hybrid material thus prep. can easily be used at the surface of the semiconductor sensitive layer of a gas sensor, by the usual techniques, for example by means of an microinjector. Presented is a process for prepn. of a hybrid nanomaterial contg. metal nanoparticles, possibly oxidized, including: (1) formation of nanoparticles of the aforesaid metal, from a precursor metal, in presence of a ligand of formula (L): Y-X-G (L) under hydrogen pressure; (2) the polymn. within a solid material; and (3) calcination of material obtained. In the formula (L): G represents a hydrolyzable, polycondensable group such as -Si(OR)3 in which R is a C1-20 alkyl group, preferably C1-10-; Y represents a group chosen among amines NRR', thiols, phosphines, or the phosphonate, phosphate or carboxylate groups, with R and R' being identical or different, and selected from a hydrogen atom or an a
Advanced Functional Materials, Oct 3, 2007
RuO 2 @SiO 2 nanomaterials have been prepared using hybrid mesostructured silica (EtO) 2 P(O)(CH ... more RuO 2 @SiO 2 nanomaterials have been prepared using hybrid mesostructured silica (EtO) 2 P(O)(CH 2 ) 3 SiO 1.5 /xSiO 2 (x = 9, 16) by anchoring the metal precursor [Ru(COD)(COT)] (COD = 1, 3-cyclooctadiene, COT = 1, 3, 5-cyclooctatriene) within the pores of the organized silica matrix taking profit of the phosphonate moieties followed by i) decomposition under dihydrogen atmosphere at room temperature in THF to achieve ruthenium nanoparticles containing materials and ii) a solid state thermal treatment at 450°C under air. The Ru and RuO 2 nanoparticles containing materials have been characterised by elemental analysis, Transmission Electron Microscopy (TEM), X-Ray Diffraction (XRD), nitrogen sorption measurements and 31 P and 13 C Nuclear Magnetic Resonance (NMR). The so-obtained RuO 2 @SiO 2 nanomaterials were evaluated as catalytic filters when deposited onto gas sensors for the preferential detection of propane in a multicomponent gas mixture propane/carbon monoxide/nitrogen dioxide.
Org Lett, 2009
Palladium-catalyzed alpha-arylation and vinylation of dioxolane (S,S)-I, easily obtained from (S)... more Palladium-catalyzed alpha-arylation and vinylation of dioxolane (S,S)-I, easily obtained from (S)-mandelic acid, proceeds with high yields and excellent diastereoselectivity at room temperature employing commercially available P(t-Bu)(3).HBF(4) and Pd(OAc)(2) as a catalytic precursor system. This method displays general utility for a large variety of aryl, heteroaryl, and vinyl bromides.
ABSTRACT The invention relates to novel hybrid nanomaterials the prepn. and the use thereof as ca... more ABSTRACT The invention relates to novel hybrid nanomaterials the prepn. and the use thereof as catalytic filters for gas sensors. The new hybrid material thus prep. can easily be used at the surface of the semiconductor sensitive layer of a gas sensor, by the usual techniques, for example by means of an microinjector. Presented is a process for prepn. of a hybrid nanomaterial contg. metal nanoparticles, possibly oxidized, including: (1) formation of nanoparticles of the aforesaid metal, from a precursor metal, in presence of a ligand of formula (L): Y-X-G (L) under hydrogen pressure; (2) the polymn. within a solid material; and (3) calcination of material obtained. In the formula (L): G represents a hydrolyzable, polycondensable group such as -Si(OR)3 in which R is a C1-20 alkyl group, preferably C1-10-; Y represents a group chosen among amines NRR', thiols, phosphines, or the phosphonate, phosphate or carboxylate groups, with R and R' being identical or different, and selected from a hydrogen atom or an a
Tetrahedron Asymmetry
Chiral dithioether ligands have been tested in the model Pd-catalysed allylic alkylation reaction... more Chiral dithioether ligands have been tested in the model Pd-catalysed allylic alkylation reaction of (±)-3-acetoxy-1,3-diphenyl-1-propene with dimethyl malonate, giving high enantioselectivity (up to 81% e.e.) for the first time in this type of system. Pd(II)-allylic intermediates, [Pd(h 3 -1,3-Ph 2 -C 3 H 3)(dithioether)]PF 6 were prepared and characterised both in solution by NMR spectroscopy and solid state. The X-ray structure for [Pd(h 3 -1,3-Ph 2 -C 3 H 3)(L)]PF 6 (L=(R,R)-7,8-O-isopropylidene-1,5-dithia-cyclononane) was determined.
ChemInform, 2009
ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance t... more ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
The invention relates to novel hybrid nanomaterials the prepn. and the use thereof as catalytic f... more The invention relates to novel hybrid nanomaterials the prepn. and the use thereof as catalytic filters for gas sensors. The new hybrid material thus prep. can easily be used at the surface of the semiconductor sensitive layer of a gas sensor, by the usual techniques, for example by means of an microinjector. Presented is a process for prepn. of a hybrid nanomaterial contg. metal nanoparticles, possibly oxidized, including: (1) formation of nanoparticles of the aforesaid metal, from a precursor metal, in presence of a ligand of formula (L): Y-X-G (L) under hydrogen pressure; (2) the polymn. within a solid material; and (3) calcination of material obtained. In the formula (L): G represents a hydrolyzable, polycondensable group such as -Si(OR)3 in which R is a C1-20 alkyl group, preferably C1-10-; Y represents a group chosen among amines NRR', thiols, phosphines, or the phosphonate, phosphate or carboxylate groups, with R and R' being identical or different, and selected from ...
Journal of the Chemical Society, Dalton Transactions, 1998
The co-ordination behaviour of the chiral bis (oxazoline) ligands ortho-, meta-, and para-bis [(4... more The co-ordination behaviour of the chiral bis (oxazoline) ligands ortho-, meta-, and para-bis [(4R)-4-ethyl-3, 4-dihydrooxazol-2-yl] benzene (A, B, C, respectively) has been studied. Palladium and nickel complexes were synthesized and characterized in solution and in ...
Journal of the Chemical Society, Dalton Transactions, 1997
Complexes of palladium, nickel and manganese, with the chiral ligand (+)-(4′ R)-2-(4′-ethyl-3′, 4... more Complexes of palladium, nickel and manganese, with the chiral ligand (+)-(4′ R)-2-(4′-ethyl-3′, 4′-dihydrooxazol-2′-yl) phenol HL OH were synthesized and characterized by 1 H, 31 P NMR spectroscopy, magnetic susceptibility and including the crystal structure ...
Advanced Functional Materials, 2009
Emulating natural dynamism distributing earth minerals using diffusion and gravity, herein it is ... more Emulating natural dynamism distributing earth minerals using diffusion and gravity, herein it is reported a strategy to unite nanostructured materials of similar size but intrinsic physical repellence, magnetite guest bestowed with C18 alkyl chain ligands and highly hydrophilic ammonium dawsonite NH4Al(OH)2CO3 host, based in electromagnetic and chemical forces. Notwithstanding augmented polarity of nanostructured surface’s carrier, has been used as fine-tuning tool in conjunction with continuum, for triggering a disseminated array of specific interactions covering entire carrier NH4+-RDW-NP periphery. Strong interactions heighten enthalpic contributions balancing unfavourable entropic penalty. Shelter adsorbs diffused guest like conventional Fe3O4-NP dispersions but additionally, whether restricts void’s access or, sinters carrier enabling isolation of a second morphology where magnetite is quantitatively embedded into cavities left between agglomerates. Reported deposition protocol...
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
Journal of the American Chemical Society
We present the synthesis and characterization of the K intercalated rubrene (CH) phase, KRubrene ... more We present the synthesis and characterization of the K intercalated rubrene (CH) phase, KRubrene (KR) and identify the co-existence of amorphous and crystalline materials in samples where the crystalline component is phase pure. We suggest this is characteristic of many intercalated alkali metal-polyaromatic hydrocarbon (PAH) systems, including those for which superconductivity has been claimed. The systematic investigation of K-rubrene solid state reactions using both K and KH sources reveals complex competition between K intercalation and the decomposition of rubrene, producing three K-intercalated compounds, namely, KR, K(RR*), and KR' (where R* and R' are rubrene decomposition derivatives CH and CH, respectively). KR is obtained as the major phase over a wide composition range and is accompanied by the formation of amorphous by-products from the decomposition of rubrene. K(RR*) is synthesized as a single phase and KR' is obtained only as a secondary phase to the majority KR phase. The crystal structure of KR was determined using high resolution powder X-ray diffraction, revealing that the structural rearrangement from pristine rubrene creates two large voids per rubrene within the molecular layers in which K is incorporated. K cations accommodated within the large voids interact strongly with the neighbouring rubrene via η, η and η binding modes to the tetracene cores and the phenyl groups. This contrasts with other intercalated PAHs where only a single void per PAH is created and the intercalated K weakly interact with the host. The decomposition products of rubrene are also examined using solution NMR, highlighting the role of the breaking of C-C bonds. For the crystalline decomposition derivative products K(RR*) and KR', a lack of definitive structural information with regards to R* and R' prevents the crystal structures being determined. The study illustrates the complexity in accessing solvent-free alkali metal salts of reduced PAH of the type claimed to afford superconductivity.
ABSTRACT The invention relates to novel hybrid nanomaterials the prepn. and the use thereof as ca... more ABSTRACT The invention relates to novel hybrid nanomaterials the prepn. and the use thereof as catalytic filters for gas sensors. The new hybrid material thus prep. can easily be used at the surface of the semiconductor sensitive layer of a gas sensor, by the usual techniques, for example by means of an microinjector. Presented is a process for prepn. of a hybrid nanomaterial contg. metal nanoparticles, possibly oxidized, including: (1) formation of nanoparticles of the aforesaid metal, from a precursor metal, in presence of a ligand of formula (L): Y-X-G (L) under hydrogen pressure; (2) the polymn. within a solid material; and (3) calcination of material obtained. In the formula (L): G represents a hydrolyzable, polycondensable group such as -Si(OR)3 in which R is a C1-20 alkyl group, preferably C1-10-; Y represents a group chosen among amines NRR', thiols, phosphines, or the phosphonate, phosphate or carboxylate groups, with R and R' being identical or different, and selected from a hydrogen atom or an a
Advanced Functional Materials, Oct 3, 2007
RuO 2 @SiO 2 nanomaterials have been prepared using hybrid mesostructured silica (EtO) 2 P(O)(CH ... more RuO 2 @SiO 2 nanomaterials have been prepared using hybrid mesostructured silica (EtO) 2 P(O)(CH 2 ) 3 SiO 1.5 /xSiO 2 (x = 9, 16) by anchoring the metal precursor [Ru(COD)(COT)] (COD = 1, 3-cyclooctadiene, COT = 1, 3, 5-cyclooctatriene) within the pores of the organized silica matrix taking profit of the phosphonate moieties followed by i) decomposition under dihydrogen atmosphere at room temperature in THF to achieve ruthenium nanoparticles containing materials and ii) a solid state thermal treatment at 450°C under air. The Ru and RuO 2 nanoparticles containing materials have been characterised by elemental analysis, Transmission Electron Microscopy (TEM), X-Ray Diffraction (XRD), nitrogen sorption measurements and 31 P and 13 C Nuclear Magnetic Resonance (NMR). The so-obtained RuO 2 @SiO 2 nanomaterials were evaluated as catalytic filters when deposited onto gas sensors for the preferential detection of propane in a multicomponent gas mixture propane/carbon monoxide/nitrogen dioxide.
Org Lett, 2009
Palladium-catalyzed alpha-arylation and vinylation of dioxolane (S,S)-I, easily obtained from (S)... more Palladium-catalyzed alpha-arylation and vinylation of dioxolane (S,S)-I, easily obtained from (S)-mandelic acid, proceeds with high yields and excellent diastereoselectivity at room temperature employing commercially available P(t-Bu)(3).HBF(4) and Pd(OAc)(2) as a catalytic precursor system. This method displays general utility for a large variety of aryl, heteroaryl, and vinyl bromides.
ABSTRACT The invention relates to novel hybrid nanomaterials the prepn. and the use thereof as ca... more ABSTRACT The invention relates to novel hybrid nanomaterials the prepn. and the use thereof as catalytic filters for gas sensors. The new hybrid material thus prep. can easily be used at the surface of the semiconductor sensitive layer of a gas sensor, by the usual techniques, for example by means of an microinjector. Presented is a process for prepn. of a hybrid nanomaterial contg. metal nanoparticles, possibly oxidized, including: (1) formation of nanoparticles of the aforesaid metal, from a precursor metal, in presence of a ligand of formula (L): Y-X-G (L) under hydrogen pressure; (2) the polymn. within a solid material; and (3) calcination of material obtained. In the formula (L): G represents a hydrolyzable, polycondensable group such as -Si(OR)3 in which R is a C1-20 alkyl group, preferably C1-10-; Y represents a group chosen among amines NRR', thiols, phosphines, or the phosphonate, phosphate or carboxylate groups, with R and R' being identical or different, and selected from a hydrogen atom or an a
Tetrahedron Asymmetry
Chiral dithioether ligands have been tested in the model Pd-catalysed allylic alkylation reaction... more Chiral dithioether ligands have been tested in the model Pd-catalysed allylic alkylation reaction of (±)-3-acetoxy-1,3-diphenyl-1-propene with dimethyl malonate, giving high enantioselectivity (up to 81% e.e.) for the first time in this type of system. Pd(II)-allylic intermediates, [Pd(h 3 -1,3-Ph 2 -C 3 H 3)(dithioether)]PF 6 were prepared and characterised both in solution by NMR spectroscopy and solid state. The X-ray structure for [Pd(h 3 -1,3-Ph 2 -C 3 H 3)(L)]PF 6 (L=(R,R)-7,8-O-isopropylidene-1,5-dithia-cyclononane) was determined.
ChemInform, 2009
ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance t... more ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
The invention relates to novel hybrid nanomaterials the prepn. and the use thereof as catalytic f... more The invention relates to novel hybrid nanomaterials the prepn. and the use thereof as catalytic filters for gas sensors. The new hybrid material thus prep. can easily be used at the surface of the semiconductor sensitive layer of a gas sensor, by the usual techniques, for example by means of an microinjector. Presented is a process for prepn. of a hybrid nanomaterial contg. metal nanoparticles, possibly oxidized, including: (1) formation of nanoparticles of the aforesaid metal, from a precursor metal, in presence of a ligand of formula (L): Y-X-G (L) under hydrogen pressure; (2) the polymn. within a solid material; and (3) calcination of material obtained. In the formula (L): G represents a hydrolyzable, polycondensable group such as -Si(OR)3 in which R is a C1-20 alkyl group, preferably C1-10-; Y represents a group chosen among amines NRR', thiols, phosphines, or the phosphonate, phosphate or carboxylate groups, with R and R' being identical or different, and selected from ...
Journal of the Chemical Society, Dalton Transactions, 1998
The co-ordination behaviour of the chiral bis (oxazoline) ligands ortho-, meta-, and para-bis [(4... more The co-ordination behaviour of the chiral bis (oxazoline) ligands ortho-, meta-, and para-bis [(4R)-4-ethyl-3, 4-dihydrooxazol-2-yl] benzene (A, B, C, respectively) has been studied. Palladium and nickel complexes were synthesized and characterized in solution and in ...
Journal of the Chemical Society, Dalton Transactions, 1997
Complexes of palladium, nickel and manganese, with the chiral ligand (+)-(4′ R)-2-(4′-ethyl-3′, 4... more Complexes of palladium, nickel and manganese, with the chiral ligand (+)-(4′ R)-2-(4′-ethyl-3′, 4′-dihydrooxazol-2′-yl) phenol HL OH were synthesized and characterized by 1 H, 31 P NMR spectroscopy, magnetic susceptibility and including the crystal structure ...