排序方式: 共有11条查询结果,搜索用时 375 毫秒
1.
Afshan Banu D.E. Vasundhara Ravi S. Lamani I.A.M. Khazi Noor Shahina Begum 《Journal of Saudi Chemical Society》2013,17(2):211-217
The preparation of 2-(4-fluorobenzyl)-6-(4-methoxyphenyl)-5-morpholin-1-ylmethyl imidazo[2,1-b][1,3,4]thiadiazole via the intermediate 2-(4-fluorobenzyl)-6-(4-methoxyphenyl)Imidazo[2,1-b][1,3,4] thiadiazole is described. Elemental analysis, IR spectrum, 1H NMR and X-ray crystal structure analyses were carried out to determine the compositions and molecular structures of the two compounds. The crystal packing exhibits intermolecular C–H?O, C–H?N, C–H?F and π–π stacking interactions leading to the formation of the supramolecular network. 相似文献
2.
3.
Hiremath RK Rabinal MK Mulimani BG Khazi IM 《Langmuir : the ACS journal of surfaces and colloids》2008,24(19):11300-11306
Silicon surface was chemically modified by covalent attachment of homologous organic molecules having different dipole moments. Surface photovoltage measurements clearly confirm that organic molecules have a profound effect on surface band bending of semiconductor. Metal-molecules--silicon junctions were constituted for molecules belonging to ethynylbenzene series using soft mercury contact. These junctions show a systematic change in the electrical charge transport with dipole moment of molecules. Parameters such as ideality factor, barrier height, and density of interface states of various junctions are estimated to understand the role of organic molecules. These studies offer the prospect to develop molecular electronics, which may find potential applications in solar cells and chemical and biological sensors. 相似文献
4.
Noor Shahina Begum D. E. Vasundhara C. R. Girija G. D. Kolavi V. S. Hegde I. M. Khazi 《Journal of chemical crystallography》2007,37(3):193-198
Imidazo[2,1-b][1,3,4] thiadiazole derivatives are significant for their various pharmacological properties. This paper reports
the synthesis and structure of one of them, 2-cyclohexyl-6-(2-oxo-2H-chromen-3-yl)imidazo[2,1-b][1,3,4]thiadiazole-5-carbaldehyde.
The compound crystallizes in the monoclinic space group P21/c with a=17.316(3)?, b=6.5420(9)?, c =17.056(3)?, β=112.909(2)°, V=1779.7(4)?3, z=4. The, Imidazo[2,1-b][1,3,4] thiadiazole and the coumarin ring systems are each planar but inclined at an angle of 48.14(2)°
towards each other. The crystal structure is stabilized by C–H … O interactions. 相似文献
5.
Noor Shahina Begum D. E. Vasundhara C. R. Girija G. D. Kolavi V. S. Hegde I. M. Khazi 《Journal of chemical crystallography》2007,37(8):561-565
The crystal structure of the title compound has been determined. The compound crystallizes in the monoclinic space group P21/c with a = 5.9885(2) Å, b = 14.7345(4) Å, c = 12.3719(4) Å, β = 96.655(5)°, V = 1084.31(8) Å3, z = 4. An intramolecular N–H···N hydrogen bond forms a pseudo-six-membered ring with graph set S 1 1(6). The crystal structure is stabilized by intermolecular interactions of the type N–H···N and C–H···N. The packing motifs in accordance with Etter’s analysis are R 2 2(8) corresponding to N–H···N dimer and that generated by the chain is C(7). 相似文献
6.
Symmetrical 2,5-disubstituted thiophene derivatives containing 1,3,4-oxadiazole moiety bearing different aromatic substitutions
were synthesized by employing convenient and simple synthetic protocols using thiophene-2,5,dicarboxylic acid as a starting
material. The structures of these target molecules were established by their analytical and spectral data. The photophysical
and electrochemical studies were carried out on these compounds and found that they exhibit good fluorescent properties with
high quantum yield. 相似文献
7.
8.
Lohit Naik Narahari Deshapande Imtiyaz Ahamed M. Khazi G. H. Malimath 《Brazilian Journal of Physics》2018,48(1):16-24
In the present work, we have carried out energy transfer studies using newly synthesised derivatives of thiophene substituted 1,3,4-oxadiazoles namely, 2-(-4-(thiophene-3-yl)phenyl)-5-(5-(thiophene-3-yl)thiophene-2-yl)-1,3,4-oxadiazole [TTO], 2-(-4-(benzo[b]thiophene-2-yl)phenyl)-5-(5-(benzo[b]thiophene-2-yl)-1,3,4-oxadiozole [TBO] and 2-(4-(4-(trifluoromethyl)phenyl)phenyl)-5-(5-(4-(trifluoromethyl)phenyl)thiophen-2-yl)-1,3,4-oxadiazole [TMO] as donors and laser dye coumarin-334 as acceptor in ethanol and dye-doped polymer (poly(methyl methacrylate) (PMMA)) media following steady-state and time-resolved fluorescence methods. Bimolecular quenching constant (k q), translation diffusion rate parameter (k d), diffusion length (D l), critical transfer distance (R 0), donor- acceptor distance (r) and energy transfer efficiency (E T) are calculated. It is observed that, critical transfer distance is more than the diffusion length for all the pairs. Further, bimolecular quenching constant is also more than the translation diffusion rate parameter. Hence, our experimental findings suggest that overall energy transfer is due to Förster resonance energy transfer (FRET) between donor and acceptor in both the media and for all the pairs. In addition, considerable increase in fluorescence intensity and energy transfer efficiency is observed in dye-doped polymer matrix systems as compared to liquid media. This suggests that, these donor-acceptor pairs doped in PMMA matrix may be used for applications such as energy transfer dye lasers (ETDL) to improve the efficiency and photostability, to enhance tunability and for plastic scintillation detectors. 相似文献
9.
10.