Faculty Publications

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Author: search.filters.author.Chandrakantha, B.

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    Investigation of the photoalignment effect of 1, 3, 4-oxadiazoles bearing 2-fluoro-4-methoxy phenyl moiety
    (2010) Alla, R.A.; Hegde, G.; Isloor, A.M.; Chandrakantha, B.; Shetty, P.; Komitov, L.
    A new series of 1,3,4-oxadiazole derivatives containing 2-fluoro-4-methoxy moiety were synthesized by refluxing mixture of acid hydrazide 3 with different aromatic carboxylic acid in phosphorous oxychloride. Photoalignment studies were performed on these materials indicating that the position of fluorine plays vital role in promoting planar alignment either parallel or perpendicular to the light polarization direction. © 2010 ITE and SID.
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    5-Dimethyl-amino-N,N-dimethyl-2-nitro-benzamide
    (2009) Fun, H.-K.; Jebas, S.R.; Chandrakantha, B.; Padmar, V.; Isloor, A.M.
    In the title compound, C11H15N3O 3, one of the methyl groups attached to the benzamide unit is slightly twisted with a C - N - C - C torsion angle of 4.04 (13)°. The crystal packing is stabilized by weak intermolecular C - H?O hydrogen bonds together with a weak C - H?? inter-action.
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    N,N-Bis(2,6-difluorobenzyl)-1,3,4-thia-diazol-2-amine
    (2009) Fun, H.-K.; Liew, W.-C.; Chandrakantha, B.; Isloor, A.M.
    In the title compound, C16H11F4N 3S, the dihedral angles between the thia-diazole ring and the difluorobenzyl rings are 81.95 (7) and 81.96 (7)°, whereas the dihedral angle between the difluorobenzyl rings is 11.41 (7)°. In the crystal structure, C - H?N and C - H?F inter-actions link the molecules into two-dimensional arrays parallel to the bc plane. © Fun et al. 2009.
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    1-Dibromomethyl-4-methoxy-2-nitrobenzene
    (2009) Fun, H.-K.; Goh, J.H.; Chandrakantha, B.; Isloor, A.M.
    The asymmetric unit of the title compound, C8H 7Br2NO3, comprises two crystallographically independent molecules (A and B). The nitro groups are twisted from the attached benzene rings, making dihedral angles of 39.26 (9) and 35.90 (9)° in molecules A and B, respectively. In each mol-ecule, the dibromo-methyl group is orientated in such a way that the two Br atoms are tilted away from the benzene ring. An inter-esting features of the crystal structure is the two short Br?Br inter-actions which, together with inter-molecular C - H?O hydrogen bonds, link the molecules into an extended three-dimensional network. The crystal structure is further stabilized by weak C - H?? inter-actions. © Fun et al. 2009.
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    Synthesis, characterization and biological activity of some new 1,3,4-oxadiazole bearing 2-flouro-4-methoxy phenyl moiety
    (2010) Chandrakantha, B.; Shetty, P.; Nambiyar, V.; Isloor, N.; Isloor, A.M.
    In the present study a series of new 1,3,4-oxadiazole derivatives containing 2-fluoro-4-methoxy moiety were synthesized. These newly synthesized compounds were characterized by NMR, mass spectral, IR spectral study and also by C, H, N analyses. All the newly synthesized compounds were screened for their antibacterial and antifungal studies. Antimicrobial studies revealed that compounds 4a and 4b showed significant antibacterial activity against Escherichia coli and Pseudomonas aeruginosa Compound 4i showed significant antifungal activity against C. albicans. © 2009 Elsevier Masson SAS. All rights reserved.
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    2-Chloro-4-nitro-1H-imidazole
    (2010) Fun, H.-K.; Goh, J.H.; Chandrakantha, B.; Isloor, A.M.; Shetty, P.
    The molecule of the title compound, C3H2ClN 3O2, is almost planar; the dihedral angle between the imidazole ring and the nitro group is 1.7 (2)°. In the crystal structure, pairs of inter-molecular C-H?O hydrogen bonds link inversion-related molecules into dimers, generating R22(10) ring motifs. The dimers are inter-connected into two-dimensional networks parallel to (102) via inter-molecular N-H?N hydrogen bonds. Further stabilization is provided by short inter-molecular Cl?O inter-actions [3.142 (2) and 3.1475 (19) Å].
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    Ethyl 1,5-diphenyl-1H-pyrazole-4-carboxylate
    (2010) Fun, H.-K.; Ching Kheng, C.K.; Chandrakantha, B.; Isloor, A.M.; Shetty, P.
    The asymmetric unit of the title compound, C18H 16N2O2, contains two independent molecules (A and B). In molecule A, the pyrazole ring is inclined at angles of 48.86 (6) and 60.80 (6)° with respect to the two phenyl rings; the corresponding angles for molecule B are 46.86 (6) and 58.63 (6)°. In the crystal, molecules of type A are linked into sheets parallel to (001) via weak C-H?O hydrogen bonds, whereas the molecules of type B are linked into chains along [010] via weak C-H?O hydrogen bonds.
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    Ethyl 1-tert-butyl-5-phenyl-1H-pyrazole-4-carboxylate
    (2010) Fun, H.-K.; Ching Kheng, C.K.; Chandrakantha, B.; Isloor, A.M.; Shetty, P.
    In the title compound, C16H20N2O 2, the pyrazole ring is essentially planar [maximum deviation = 0.008 (2) Å] and is inclined at an angle of 82.82 (10)° with respect to the phenyl ring. The crystal packing is consolidated by pairs of intermolecular C-H?O hydrogen bonds, which link the molecules into centrosymmetric dimers stacked along the a axis.
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    2-Methyl-5-[(3-methyl-4-nitrobenzyl)-sulfanyl]-1,3,4-thiadiazole
    (2011) Fun, H.-K.; Chantrapromma, S.; Chandrakantha, B.; Isloor, A.M.; Shetty, P.
    The molecule of the title thiadiazole derivative, C11H 11N3O2S2, has a butterfly-like structure and the whole molecule is disordered with a site-occupancy ratio of 0.629 (4):0.371 (4). The molecule is disordered in such a way that the 3-methyl-4-nitrophenyl units of the major and minor components are approximately related by 180° rotation around the C - N bond axis. The dihedral angle between the 1,3,4-thiadiazole and benzene rings is 70.8 (4) ° in the major component and 74.9 (6) ° in the minor component. In the crystal, molecules are arranged into screw chains along the c axis. These chains are stacked along the b axis. Weak intermolecular C - H?O and C - H?? interactions and a short C?O contact [3.005 (7) Å] are present.
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    5-[(4-methoxybenzyl)sulfanyl]-2-methyl-1,3,4-thiadiazole
    (2011) Fun, H.-K.; Chantrapromma, S.; Chandrakantha, B.; Isloor, A.M.; Shetty, P.
    The title molecule, C11H12N2OS 2, is twisted with a dihedral angle of 83.63 (12)° between the 1,3,4-thiadiazole and benzene rings. The methoxy group deviates slightly from the attached benzene ring, with a C - C - O - C torsion angle of 4.2 (4)°. In the crystal, molecules are linked by weak C - H?N interactions and stacked along the c axis.