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Papers by Sathishkumar Ramalingam
RSC Advances, Mar 2013
The 1,5-diketone, diphenacylaniline, yielded an enamine under Gewald condition, while another 1,5... more The 1,5-diketone, diphenacylaniline, yielded an enamine under Gewald condition, while another 1,5-diketone,
diphenacyl sulfide, resulted in thioamide formation under identical condition. 2-Amino-4-(3-oxo-1,3-
diphenylpropyl)-4,5,6,7-tetrahydro benzo[b]thiophene-3-carbonitrile was obtained from the 1,5-diketone 2-(3-oxo-
10 1,3-diphenylpropyl)-1-cyclohexanone under the same condition.
![Research paper thumbnail of 1-(4-Methylphenyl)-2-[4-(trifluoromethyl) phenyl]-1H-phenanthro[9,10-d]- imidazole](https://attachments.academia-assets.com/31128333/thumbnails/1.jpg)
](Acta Crystallographica Section E, Apr 7, 2013
In the title compound, C29H19F3N2, the tetracyclic ring system is essentially planar [maximum de... more In the title compound, C29H19F3N2, the tetracyclic ring system
is essentially planar [maximum deviation from the best plane =
0.076 (1) A ° ] and makes dihedral angles of 78.10 (5) and
33.71 (4) with the methylphenyl and fluorophenyl rings,
respectively. An intramolecular C—H interaction occurs.
In the crystal, pairs of C—H interactions link inversionrelated
molecules.
Journal of Luminescence, Feb 6, 2013
A new type of emitter 2-(4-fluorophenyl)-1-phenyl-1H-phenanthro [9,10-d] imidazole has been desi... more A new type of emitter 2-(4-fluorophenyl)-1-phenyl-1H-phenanthro [9,10-d] imidazole has been
designed and synthesized. Absorption, emission, FT-IR and lifetime spectroscopies have been used to
investigate the binding of phenanthroimidazole molecule with the nanoparticulate anatase and rutile
TiO2. The fluorescence emission of the phenanthroimidazole is quenched effectively by anatase
particulate TiO2 due to charge injection from the excited singlet state of phenanthroimidazole to the
conduction band of the TiO2 nanocrystals. Surprisingly, nanocrystalline rutile enhances the fluorescence.
This is because of lowering of LUMO and HOMO energy levels of phenanthroimidazole molecule.
Electron injection from photoexcited phenanthroimidazole to conduction band of rutile TiO2
ðS-Sþ þe
CBÞ is likely to enhance the fluorescence. The HOMO and LUMO energies of phenanthroimidazole
are deduced from cyclic voltammetric results. To support the experimental results DFT
calculation has been made for Gaussian-03.
![Research paper thumbnail of Fluorescence investigation of the interaction of 2-(4-fluorophenyl)-1-phenyl-1Hphenanthro [9,10-d] imidazole with bovine serum albumin](https://attachments.academia-assets.com/30619979/thumbnails/1.jpg)
](Journal of Photochemistry and Photobiology B: Biology, Oct 15, 2012
The interaction between 2-(4-fluorophenyl)-1-phenyl-1H-phenanthro [9,10-d] imidazole (FPPI) and b... more The interaction between 2-(4-fluorophenyl)-1-phenyl-1H-phenanthro [9,10-d] imidazole (FPPI) and bovine serum albumin (BSA) was investigated by fluorescence spectral studies. The observed experimental result shows that the imidazole derivative has strong ability to quench the fluorescence of BSA by forming complex which is stabilized by electrostatic interactions. The effective quenching constants (K sv ) were 2.78 Â 10 4 , 2.52 Â 10 4 , and 2.32 Â 10 4 at 301, 310, and 318 K respectively. The Stern-Volmer quenching constant (K sv ), binding site number (n), apparent binding constant (K A ) and corresponding thermodynamic parameters (DG, DH, and DS) were calculated. The distance between the donor (BSA) and acceptor (FPPI) was obtained according to fluorescence resonance energy transfer (FRET). Conformational changes of BSA were observed from synchronous fluorescence technique. The effect of metal ions such as Cu 2+ , Zn 2+ , Ca 2+ , Mg 2+ , Ni 2+ , Co 2+ , and Fe 2+ on the binding constants between the FPPI and BSA were also studied.
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, Sep 26, 2012
This article appeared in a journal published by Elsevier. The attached copy is furnished to the a... more This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution and sharing with colleagues.
![Research paper thumbnail of 1-(3,5-Dimethylphenyl)-2-(4-fluorophenyl)-1H-phenanthro[9,10-d]imidazole](https://attachments.academia-assets.com/30619947/thumbnails/1.jpg)
](Acta Crystallographica Section E, Feb 4, 2013
Key indicators: single-crystal X-ray study; T = 295 K; mean (C-C) = 0.002 Å; R factor = 0.039; wR... more Key indicators: single-crystal X-ray study; T = 295 K; mean (C-C) = 0.002 Å; R factor = 0.039; wR factor = 0.109; data-to-parameter ratio = 12.9.
![Research paper thumbnail of 2-(4-Fluorophenyl)-1-(4-methoxyphenyl)- 1H-phenanthro[9,10-d]imidazole](https://attachments.academia-assets.com/30619924/thumbnails/1.jpg)
](Acta Crystallographica Section E, Feb 4, 2013
Key indicators: single-crystal X-ray study; T = 293 K; mean (C-C) = 0.002 Å; R factor = 0.035; wR... more Key indicators: single-crystal X-ray study; T = 293 K; mean (C-C) = 0.002 Å; R factor = 0.035; wR factor = 0.098; data-to-parameter ratio = 12.8. organic compounds o368 Mohandas et al.
![Research paper thumbnail of 2-(4-Fluorophenyl)-1-(4-methylphenyl)-1H-phenanthro [9, 10-d] imidazole](https://attachments.academia-assets.com/28522370/thumbnails/1.jpg)
](… Section E: Structure …, Jan 1, 2012
This open-access article is distributed under the terms of the Creative Commons Attribution Licen... more This open-access article is distributed under the terms of the Creative Commons Attribution Licence http://creativecommons.org/licenses/by/2.0/uk/legalcode, which permits unrestricted use, distribution, and reproduction in any medium, provided the original authors and source are cited.
… Acta Part A: Molecular …, Jan 1, 2012
Spectrochimica Acta Part …, Jan 1, 2012
RSC Advances, Mar 2013
The 1,5-diketone, diphenacylaniline, yielded an enamine under Gewald condition, while another 1,5... more The 1,5-diketone, diphenacylaniline, yielded an enamine under Gewald condition, while another 1,5-diketone,
diphenacyl sulfide, resulted in thioamide formation under identical condition. 2-Amino-4-(3-oxo-1,3-
diphenylpropyl)-4,5,6,7-tetrahydro benzo[b]thiophene-3-carbonitrile was obtained from the 1,5-diketone 2-(3-oxo-
10 1,3-diphenylpropyl)-1-cyclohexanone under the same condition.
Acta Crystallographica Section E, Apr 7, 2013
In the title compound, C29H19F3N2, the tetracyclic ring system is essentially planar [maximum de... more In the title compound, C29H19F3N2, the tetracyclic ring system
is essentially planar [maximum deviation from the best plane =
0.076 (1) A ° ] and makes dihedral angles of 78.10 (5) and
33.71 (4) with the methylphenyl and fluorophenyl rings,
respectively. An intramolecular C—H interaction occurs.
In the crystal, pairs of C—H interactions link inversionrelated
molecules.
Journal of Luminescence, Feb 6, 2013
A new type of emitter 2-(4-fluorophenyl)-1-phenyl-1H-phenanthro [9,10-d] imidazole has been desi... more A new type of emitter 2-(4-fluorophenyl)-1-phenyl-1H-phenanthro [9,10-d] imidazole has been
designed and synthesized. Absorption, emission, FT-IR and lifetime spectroscopies have been used to
investigate the binding of phenanthroimidazole molecule with the nanoparticulate anatase and rutile
TiO2. The fluorescence emission of the phenanthroimidazole is quenched effectively by anatase
particulate TiO2 due to charge injection from the excited singlet state of phenanthroimidazole to the
conduction band of the TiO2 nanocrystals. Surprisingly, nanocrystalline rutile enhances the fluorescence.
This is because of lowering of LUMO and HOMO energy levels of phenanthroimidazole molecule.
Electron injection from photoexcited phenanthroimidazole to conduction band of rutile TiO2
ðS-Sþ þe
CBÞ is likely to enhance the fluorescence. The HOMO and LUMO energies of phenanthroimidazole
are deduced from cyclic voltammetric results. To support the experimental results DFT
calculation has been made for Gaussian-03.
Journal of Photochemistry and Photobiology B: Biology, Oct 15, 2012
The interaction between 2-(4-fluorophenyl)-1-phenyl-1H-phenanthro [9,10-d] imidazole (FPPI) and b... more The interaction between 2-(4-fluorophenyl)-1-phenyl-1H-phenanthro [9,10-d] imidazole (FPPI) and bovine serum albumin (BSA) was investigated by fluorescence spectral studies. The observed experimental result shows that the imidazole derivative has strong ability to quench the fluorescence of BSA by forming complex which is stabilized by electrostatic interactions. The effective quenching constants (K sv ) were 2.78 Â 10 4 , 2.52 Â 10 4 , and 2.32 Â 10 4 at 301, 310, and 318 K respectively. The Stern-Volmer quenching constant (K sv ), binding site number (n), apparent binding constant (K A ) and corresponding thermodynamic parameters (DG, DH, and DS) were calculated. The distance between the donor (BSA) and acceptor (FPPI) was obtained according to fluorescence resonance energy transfer (FRET). Conformational changes of BSA were observed from synchronous fluorescence technique. The effect of metal ions such as Cu 2+ , Zn 2+ , Ca 2+ , Mg 2+ , Ni 2+ , Co 2+ , and Fe 2+ on the binding constants between the FPPI and BSA were also studied.
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, Sep 26, 2012
This article appeared in a journal published by Elsevier. The attached copy is furnished to the a... more This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution and sharing with colleagues.
Acta Crystallographica Section E, Feb 4, 2013
Key indicators: single-crystal X-ray study; T = 295 K; mean (C-C) = 0.002 Å; R factor = 0.039; wR... more Key indicators: single-crystal X-ray study; T = 295 K; mean (C-C) = 0.002 Å; R factor = 0.039; wR factor = 0.109; data-to-parameter ratio = 12.9.
Acta Crystallographica Section E, Feb 4, 2013
Key indicators: single-crystal X-ray study; T = 293 K; mean (C-C) = 0.002 Å; R factor = 0.035; wR... more Key indicators: single-crystal X-ray study; T = 293 K; mean (C-C) = 0.002 Å; R factor = 0.035; wR factor = 0.098; data-to-parameter ratio = 12.8. organic compounds o368 Mohandas et al.
… Section E: Structure …, Jan 1, 2012
This open-access article is distributed under the terms of the Creative Commons Attribution Licen... more This open-access article is distributed under the terms of the Creative Commons Attribution Licence http://creativecommons.org/licenses/by/2.0/uk/legalcode, which permits unrestricted use, distribution, and reproduction in any medium, provided the original authors and source are cited.
… Acta Part A: Molecular …, Jan 1, 2012
Spectrochimica Acta Part …, Jan 1, 2012