M. S. Krishnamurthy
Bangalore University
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Featured researches published by M. S. Krishnamurthy.
Acta Crystallographica Section E-structure Reports Online | 2013
Nikhath Fathima; M. S. Krishnamurthy; Noor Shahina Begum
In the title compound, C14H9F3N2O, the best planes of the benzimidazole group and benzene ring form a dihedral angle of 26.68u2005(3)°. In the crystal, N—H⋯N hydrogen bonds link the molecules into infinite chains parallel to the c axis. Stacking interactions between the benzimidazole groups [centroid–centroid distance = 3.594u2005(5)u2005Å] assemble the molecules into layers parallel to (100). The trifluoromethyl group is disordered over three sets of sites with site-occupancy factors of 0.787u2005(4), 0.107u2005(7) and 0.106u2005(7).
Acta Crystallographica Section E-structure Reports Online | 2013
M. S. Krishnamurthy; Nikhath Fathima; H. Nagarajaiah; Noor Shahina Begum
In the title molecule, C13H8F2N2, the dihedral angle between the benzimidazole ring system and the difluoro-substituted benzene ring is 30.0u2005(1)°. In the crystal, molecules are linked by N—H⋯N hydrogen bonds, forming chains along [010]. In addition, weak C—H⋯F hydrogen bonds connect chains into a two-dimensional network parallel to (001). A weak C—H⋯π interaction is observed between an H atom of the benzimidazole ring sytem and the π system of the difluoro-substituted benzene ring.
Acta Crystallographica Section E: Crystallographic Communications | 2015
M. S. Krishnamurthy; Noor Shahina Begum
In the title compound, C14H14F4N2O3S, the central dihydropyrimidine ring adopts a sofa conformation with the C atom bearing the 2-fluorobenzene ring displaced by 0.596u2005(3)u2005Å from the other five atoms. The 2-fluorobenzene ring is positioned axially and bisects the pyrimidine ring with a dihedral angle of 70.92u2005(8)°. The molecular conformation is stabilized by an intramolecular O—H⋯O hydrogen bond, generating an S(6) ring. The crystal structure features C—H⋯F, N—H⋯S and N—H⋯O hydrogen bonds, which link the molecules into a three-dimensional network.
Acta Crystallographica Section E-structure Reports Online | 2014
M. S. Krishnamurthy; H. Nagarajaiah; Noor Shahina Begum
In the title molecule, C23H18F2N2O3S, the pyrimidine ring is in a half-chair conformation and the 3-fluorophenyl group is in the axial position. The thiazole ring (r.m.s. deviation = 0.0252u2005Å) forms dihedral angles of 84.8u2005(7) and 9.6u2005(7)° with the 3-fluoro-substituted and 4-fluoro-substituted benzene rings, respectively. In the crystal, weak C—H⋯F and C—H⋯O hydrogen bonds connect molecules, forming zigzag chains along the b axis. In addition π–π stacking interactions with a centroid–centroid distance of 3.7633u2005(9)u2005Å connect these chains into ladders via inversion-related 4-fluorophenyl groups.
Acta Crystallographica Section E-structure Reports Online | 2014
N. L. Prasad; M. S. Krishnamurthy; H. Nagarajaiah; Noor Shahina Begum
In the title molecule, C20H22N2O4S, the pyrimidine ring is in a flattened half-chair conformation and the 3-methoxyphenyl substituent is in an axial arrangement. The thiazole ring forms a dihedral angle of 81.3u2005(1)° with the benzene ring. In the crystal, weak C—H⋯S interactions link molecules into chains along [001]. In addition, there are π–π interactions between inversion-related thiazole rings with a centroid–centroid distance of 3.529u2005(2)u2005Å. The ethyl group was refined as disordered over two sets of sites with an occupancy ratio of 0.52u2005(3):0.48u2005(2).
Acta Crystallographica Section E: Crystallographic Communications | 2015
M. S. Krishnamurthy; Noor Shahina Begum
The title compound, C14H15FN2O2S, crystallizes with two molecules in the asymmetric unit. In each molecule, the pyrimidine ring adopts a sofa conformation with the sp 3-hybridized C atom forming the flap and the fluoro-substituted ring in an axial position. In the crystal, molecules are linked via N—H⋯S hydrogen bonds, forming chains of R 2 2(8) rings along [100]. In one independent molecule, an intramolecular C—H⋯O hydrogen bond is observed.
Acta Crystallographica Section E: Crystallographic Communications | 2015
Natarajan Lakshmi Prasad; M. S. Krishnamurthy; Harsha Nagarajaiah; Noor Shahina Begum
In the title thiophene derivative, C13H18N2O3S, the dihedral angles between the thiophene ring and the [(dimethylamino)methylidene]amino side chain (r.m.s. deviation = 0.009u2005Å) and the –CO2 ester group are 3.01u2005(16) and 59.9u2005(3)°, respectively. In the crystal, inversion dimers linked by pairs of C—H⋯O hydrogen bonds generate R 2 2(16) loops. The dimers are linked by another weak C—H⋯O interaction, forming chains along [001]. In addition, weak C—H⋯π interactions are observed, which link the chains into (001) layers.
Acta Crystallographica Section E: Crystallographic Communications | 2015
M. S. Krishnamurthy; Noor Shahina Begum; D. Shamala; K. Shivashankar
In the title molecule, C13H13N3O2, the benzopyran ring system is essentially planar, with a maximum deviation of 0.017u2005(1)u2005Å. In the crystal, weak C—H⋯O hydrogen bonds link molecules into ladders along [010]. In addition, π–π interactions between inversion-related molecules, with centroid–centroid distances in the range 3.679u2005(2)–3.876u2005(2)u2005Å, complete a two-dimensional network parallel to (001).
Acta Crystallographica Section E: Crystallographic Communications | 2015
M. S. Krishnamurthy; Noor Shahina Begum
In the title compound, C13H8ClFN2, the dihedral angle between the plane of the benzimidazole ring system (r.m.s. deviation = 0.022u2005Å) and the benzene ring is 26.90u2005(8)°. The F atom at the meta position of the benzene ring is disordered over two sites in a 0.843u2005(4):0.157u2005(4) ratio. In the crystal, molecules are linked by N—H⋯N hydrogen bonds, forming infinite C(4) chains propagating along [010]. In addition, weak C—H⋯π and π–π interactions [shortest centroid–centroid separation = 3.6838u2005(12)u2005Å] are observed, which link the chains into a three-dimensional network.
Acta Crystallographica Section E-structure Reports Online | 2014
M. S. Krishnamurthy; Noor Shahina Begum
In the title molecule, C23H18F2N2O3S, the 4-fluoro-substituted and 2-fluoro-substituted benzene rings form dihedral angles of 88.16u2005(8) and 23.1u2005(1)°, respectively, with the thiazole ring. The pyrimidine ring adopts a flattened sofa conformation with the sp 3-hydridized C atom forming the flap. In the crystal, pairs of weak C—H⋯O hydrogen bonds link molecules related by twofold rotation axes, forming R 2 2(10) rings, which are in turn linked by weak C—H⋯N interactions to form chains of rings along [010]. In addition, weak C—H⋯π(arene) interactions link the chains into layers parallel to (001) and π–π interactions with a centroid–centroid distance of 3.836u2005(10)u2005Å connect these layers into a three-dimensional network.