Browsing by Author "Vijesh, A.M."

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1,5-Dibromo-2,4-dimethoxybenzene
(2012) Vijesh, A.M.; Isloor, A.M.; Gerber, T.; Brecht, B.V.; Betz, R.
In the title compound, C8H8Br2O2, all non-H atoms lie essentially in a common plane (r.m.s deviation of all fitted non-H atoms = 0.0330 ). In the crystal, weak C-H?O hydrogen bonds connect the molecules, forming chains which extend along the b-axis direction.
1,5-Dibromo-2,4-dimethoxybenzene
(2012) Vijesh, A.M.; Isloor, A.M.; Gerber, T.; Brecht, B.V.; Betz, R.
In the title compound, C8H8Br2O2, all non-H atoms lie essentially in a common plane (r.m.s deviation of all fitted non-H atoms = 0.0330 Å). In the crystal, weak C-H?O hydrogen bonds connect the molecules, forming chains which extend along the b-axis direction.
(1Z)-1-(2,4-Dichloro-phen-yl)ethan-1-one semicarbazone
(2009) Fun, H.-K.; Balasubramani, K.; Vijesh, A.M.; Malladii, S.; Isloor, A.M.
In the title compound, C9H9Cl2N 3O, the semicarbazone group is approximately planar, with an r.m.s deviation from the mean plane of 0.011 (2) . The dihedral angle between the least-squares planes through the semicarbazone group and the benzene ring is 38.76 (9) . The crystal structure is further stabilized by N - H?O and C - H?O hydrogen bonding. Fun et al. 2009.
(1Z)-1-(2,4-Dichloro-phen-yl)ethan-1-one semicarbazone
(2009) Fun, H.-K.; Balasubramani, K.; Vijesh, A.M.; Malladii, S.; Isloor, A.M.
In the title compound, C9H9Cl2N 3O, the semicarbazone group is approximately planar, with an r.m.s deviation from the mean plane of 0.011 (2) Å. The dihedral angle between the least-squares planes through the semicarbazone group and the benzene ring is 38.76 (9)°. The crystal structure is further stabilized by N - H?O and C - H?O hydrogen bonding. © Fun et al. 2009.
2-(4-Chloroanilino)-1-(4-chlorophenyl)ethanone
(2011) Fun, H.-K.; Quah, C.K.; Vijesh, A.M.; Isloor, A.M.; Arulmoli, T.
In the title compound, C14H11Cl2NO, the benzene rings form a dihedral angle of 3.14 (6) . Overall, the molecule is close to being planar (r.m.s. deviation for all the non-H atoms = 0.054 ). No significant directional intermolecular interactions are observed in the crystal structure.
2-(4-Chloroanilino)-1-(4-chlorophenyl)ethanone
(2011) Fun, H.-K.; Ching Kheng, C.K.; Vijesh, A.M.; Isloor, A.M.; Arulmoli, T.
In the title compound, C14H11Cl2NO, the benzene rings form a dihedral angle of 3.14 (6)°. Overall, the molecule is close to being planar (r.m.s. deviation for all the non-H atoms = 0.054 Å). No significant directional intermolecular interactions are observed in the crystal structure.
2-(4-Chlorophenyl)-2-oxoethyl 3,4-dimethoxybenzoate
(2011) Fun, H.-K.; Quah, C.K.; Vijesh, A.M.; Isloor, A.M.; Arulmoli, T.
In the title compound, C17H15ClO5, the benzene rings forms a dihedral angle of 74.45 (10) . In the crystal, molecules are linked into C(13) chains along [011] via C-H?O hydrogen bonds. The crystal packing also features short Cl?Cl contacts of 3.1253 (10) ..
2-(4-Chlorophenyl)-2-oxoethyl 3,4-dimethoxybenzoate
(2011) Fun, H.-K.; Ching Kheng, C.K.; Vijesh, A.M.; Isloor, A.M.; Arulmoli, T.
In the title compound, C17H15ClO5, the benzene rings forms a dihedral angle of 74.45 (10)°. In the crystal, molecules are linked into C(13) chains along [011] via C-H?O hydrogen bonds. The crystal packing also features short Cl?Cl contacts of 3.1253 (10) Å..
2-(4-methylphenoxy)acetohydrazide
(2011) Fun, H.-K.; Quah, C.K.; Malladi, S.; Vijesh, A.M.; Isloor, A.M.
In the title compound, C9H12N2O 2, the acetohydrazide group is approximately planar [maximum deviation = 0.034 (2) ]. In the crystal, molecules are linked via intermolecular N - H?O, N - H?N and C - H?O hydrogen bonds into infinite two-dimensional networks parallel to (001).
2-(4-methylphenoxy)acetohydrazide
(2011) Fun, H.-K.; Ching Kheng, C.K.; Malladi, S.; Vijesh, A.M.; Isloor, A.M.
In the title compound, C9H12N2O 2, the acetohydrazide group is approximately planar [maximum deviation = 0.034 (2) Å]. In the crystal, molecules are linked via intermolecular N - H?O, N - H?N and C - H?O hydrogen bonds into infinite two-dimensional networks parallel to (001).
2-Dibutylamino-1-(2,7-dichloro-9H-fluoren-4-yl)ethanol
(2010) Fun, H.-K.; Yeap, C.S.; Vijesh, A.M.; Isloor, A.M.; Vasudeva, P.K.
In the title compound, C23H29Cl2NO, the fluorene ring is essentially planar, with a maximum deviation from the mean plane of 0.041 (1) . The amine group adopts a pyramidal configuration, the sum of the bond angles being 336.2 (3) . In the crystal, the molecules are linked into dimers by inter-molecular O - H?N and C - H?O hydrogen bonds. Weak C - H?? and ?-? [centroid-centroid distance = 3.7544 (7) ] interactions are also observed.
2-Dibutylamino-1-(2,7-dichloro-9H-fluoren-4-yl)ethanol
(2010) Fun, H.-K.; Yeap, C.S.; Vijesh, A.M.; Isloor, A.M.; Vasudeva, P.K.
In the title compound, C23H29Cl2NO, the fluorene ring is essentially planar, with a maximum deviation from the mean plane of 0.041 (1) Å. The amine group adopts a pyramidal configuration, the sum of the bond angles being 336.2 (3)°. In the crystal, the molecules are linked into dimers by inter-molecular O - H?N and C - H?O hydrogen bonds. Weak C - H?? and ?-? [centroid-centroid distance = 3.7544 (7) Å] interactions are also observed.
4-Amino-3-(1-naphthyloxymethyl)-1H-1,2,4-triazole-5(4H)-thione
(2010) Fun, H.-K.; Quah, C.K.; Vijesh, A.M.; Malladi, S.; Isloor, A.M.
In the title compound, C13H12N4OS, the dihedral angle between the triazole and naphthalene ring systems is 67.42 (5) . In the crystal, adjacent mol-ecules are linked via two pairs of inter-molecular N-H?S inter-actions, forming R 2 2(8) and R 2 2(10) ring motifs. Weak C-H?S inter-actions generate infinite chains along [001] and the structure is further consolidated by C-H?? bonds and aromatic ??? stacking inter-actions [distance between the centroids of the triazole rings = 3.2479 (7) ].
4-Amino-3-(1-naphthyloxymethyl)-1H-1,2,4-triazole-5(4H)-thione
(2010) Fun, H.-K.; Ching Kheng, C.K.; Vijesh, A.M.; Malladi, S.; Isloor, A.M.
In the title compound, C13H12N4OS, the dihedral angle between the triazole and naphthalene ring systems is 67.42 (5)°. In the crystal, adjacent mol-ecules are linked via two pairs of inter-molecular N-H?S inter-actions, forming R 2 2(8) and R 2 2(10) ring motifs. Weak C-H?S inter-actions generate infinite chains along [001] and the structure is further consolidated by C-H?? bonds and aromatic ??? stacking inter-actions [distance between the centroids of the triazole rings = 3.2479 (7) Å].
4-Amino-3-(o-tolyl-oxymeth-yl)-1H-1,2,4-triazole-5(4H)-thione
(2009) Fun, H.-K.; Liew, W.-C.; Vijesh, A.M.; Padaki, M.; Isloor, A.M.
The asymmetric unit of the title compound, C10H 12N4OS, contains two independent mol-ecules, A and B, which differ significantly in the relative orientations of the benzene and triazole rings. The dihedral angle between the above two rings is 6.94 (5) in mol-ecule A and 77.60 (5) in mol-ecule B. In the crystal, mol-ecules are linked into a three-dimensional network by N - H?S, N - H?O, N - H?N and C - H?S hydrogen bonds and ?-? inter-actions between the benzene and triazole rings [centroid-centroid distance = 3.5311 (6) ] are also present. 2009 Fun et al.
4-Amino-3-(o-tolyl-oxymeth-yl)-1H-1,2,4-triazole-5(4H)-thione
(2009) Fun, H.-K.; Liew, W.-C.; Vijesh, A.M.; Padaki, M.; Isloor, A.M.
The asymmetric unit of the title compound, C10H 12N4OS, contains two independent mol-ecules, A and B, which differ significantly in the relative orientations of the benzene and triazole rings. The dihedral angle between the above two rings is 6.94 (5)° in mol-ecule A and 77.60 (5)° in mol-ecule B. In the crystal, mol-ecules are linked into a three-dimensional network by N - H?S, N - H?O, N - H?N and C - H?S hydrogen bonds and ?-? inter-actions between the benzene and triazole rings [centroid-centroid distance = 3.5311 (6) Å] are also present. © 2009 Fun et al.
4-Amino-3-(p-tolyl-oxymeth-yl)-1H-1,2,4-triazole-5(4H)-thione
(2009) Fun, H.-K.; Goh, J.H.; Vijesh, A.M.; Padaki, M.; Isloor, A.M.
In the title triazole compound, C10H12N 4OS, the triazole ring is essentially planar [maximum deviation = 0.009 (1) ] and forms a dihedral angle of 5.78 (4) with the benzene ring. In the crystal structure, mol-ecules are linked into dimers by centrosymmetric N - H?S inter-actions. These dimers are linked into two-mol-ecule-wide tapes by N - H?N and S?S [3.2634 (3) ] inter-actions. In addition, they are further inter-connected by weak N - H?S inter-actions into sheets parallel to the ab plane. The crystal structure is further stabilized by weak inter-molecular C - H?? inter-actions. 2009 Fun et al.
4-Amino-3-(p-tolyl-oxymeth-yl)-1H-1,2,4-triazole-5(4H)-thione
(2009) Fun, H.-K.; Goh, J.H.; Vijesh, A.M.; Padaki, M.; Isloor, A.M.
In the title triazole compound, C10H12N 4OS, the triazole ring is essentially planar [maximum deviation = 0.009 (1) Å] and forms a dihedral angle of 5.78 (4)° with the benzene ring. In the crystal structure, mol-ecules are linked into dimers by centrosymmetric N - H?S inter-actions. These dimers are linked into two-mol-ecule-wide tapes by N - H?N and S?S [3.2634 (3) Å] inter-actions. In addition, they are further inter-connected by weak N - H?S inter-actions into sheets parallel to the ab plane. The crystal structure is further stabilized by weak inter-molecular C - H?? inter-actions. © 2009 Fun et al.
5-Diethyl-amino-2-[(E)-(4-methyl-3-nitro-phenyl)-imino-meth-yl]phenol: A redetermination
(2009) Fun, H.-K.; Kia, R.; Vijesh, A.M.; Isloor, A.M.
The title compound, C18H21N3O3, is a potential bidentate Schiff base ligand. The whole mol-ecule is disordered with a refined site-occupancy ratio of 0.567 (4):0.433 (4) and not just one ethyl group as reported previously [Sarojini et al. (2007). Acta Cryst. E63, o4782-o4782]. Using the whole mol-ecule disorder, R values are much smaller than those published. An intra-molecular O - H?N hydrogen bond generates a six-membered ring, producing an S(6) ring motif. The dihedral angle between the mean plane of the two benzene rings (major component) is 9.0 (5) . The crystal structure shows short C?C [3.189 (15)-3.298 (12) ] and C?O [2.983 (5)-3.149 (13) ] contacts. Inter-molecular C - H?O inter-actions link neighbouring mol-ecules into dimers with R 2 2(18) motifs. In the crystal structure, these dimers are linked together by inter-molecular C - H?O inter-actions into one-dimensional extended chains along the b axis. The crystal structure is further stabilized by inter-molecular ?-? stacking inter-actions [centroid-centroid distances = 3.458 (8)-3.691 (6) ].
5-Diethyl-amino-2-[(E)-(4-methyl-3-nitro-phenyl)-imino-meth-yl]phenol: A redetermination
(2009) Fun, H.-K.; Kia, R.; Vijesh, A.M.; Isloor, A.M.
The title compound, C18H21N3O3, is a potential bidentate Schiff base ligand. The whole mol-ecule is disordered with a refined site-occupancy ratio of 0.567 (4):0.433 (4) and not just one ethyl group as reported previously [Sarojini et al. (2007). Acta Cryst. E63, o4782-o4782]. Using the whole mol-ecule disorder, R values are much smaller than those published. An intra-molecular O - H?N hydrogen bond generates a six-membered ring, producing an S(6) ring motif. The dihedral angle between the mean plane of the two benzene rings (major component) is 9.0 (5)°. The crystal structure shows short C?C [3.189 (15)-3.298 (12) Å] and C?O [2.983 (5)-3.149 (13) Å] contacts. Inter-molecular C - H?O inter-actions link neighbouring mol-ecules into dimers with R 2 2(18) motifs. In the crystal structure, these dimers are linked together by inter-molecular C - H?O inter-actions into one-dimensional extended chains along the b axis. The crystal structure is further stabilized by inter-molecular ?-? stacking inter-actions [centroid-centroid distances = 3.458 (8)-3.691 (6) Å].