Browsing by Author "Suwunwong, T."

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    6-(4-Bromo-phen-yl)-2-eth-oxy-4-(2,4,6-trimethoxy-phen-yl)nicotinonitrile
    (2009) Chantrapromma, S.; Fun, H.-K.; Suwunwong, T.; Padaki, M.; Isloor, A.M.
    In the asymmetric unit of the title nicotinonitrile derivative, C 23H21BrN2O4, there are two non-planar independent mol-ecules. The central pyridine ring makes dihedral angles of 9.05 (7) and 77.06 (7) , respectively, with the 4-bromo-phenyl and 2,4,6-trimethoxy-phenyl rings in one mol-ecule, whereas the corresponding values are 5.96 (7) and 82.37 (7) in the other. All the three meth-oxy groups are essentially in the plane of the attached benzene ring [C- O- C- C angles = 2.99 (19), 4.8 (2) and-6.2 (2) in one mol-ecule, and 2.69 (18), 176.73 (15) and 1.3 (2) in the other]. The eth-oxy group is slightly twisted in one mol-ecule [C- C- O- C = 173.84 (12) ], whereas it is coplanar with the pyridine ring in the other [C- C- O- C =-177.23 (13) ]. Weak intra-molecular C- H?N inter-actions generate S(5) ring motifs. In the crystal structure, the mol-ecules are linked by weak inter-molecular C- H?N and C- H?O inter-actions into a supra-molecular three-dimensional network in such a way that the nicotinonitrile units of neighboring mol-ecules are stacked in an anti-parallel manner along the c axis. The crystal is further stabilized by C- H?? inter-actions.
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    6-(4-Bromo-phen-yl)-2-eth-oxy-4-(2,4,6-trimethoxy-phen-yl)nicotinonitrile
    (2009) Chantrapromma, S.; Fun, H.-K.; Suwunwong, T.; Padaki, M.; Isloor, A.M.
    In the asymmetric unit of the title nicotinonitrile derivative, C 23H21BrN2O4, there are two non-planar independent mol-ecules. The central pyridine ring makes dihedral angles of 9.05 (7) and 77.06 (7)°, respectively, with the 4-bromo-phenyl and 2,4,6-trimethoxy-phenyl rings in one mol-ecule, whereas the corresponding values are 5.96 (7) and 82.37 (7)° in the other. All the three meth-oxy groups are essentially in the plane of the attached benzene ring [C- O- C- C angles = 2.99 (19), 4.8 (2) and-6.2 (2)° in one mol-ecule, and 2.69 (18), 176.73 (15) and 1.3 (2)° in the other]. The eth-oxy group is slightly twisted in one mol-ecule [C- C- O- C = 173.84 (12)°], whereas it is coplanar with the pyridine ring in the other [C- C- O- C =-177.23 (13)°]. Weak intra-molecular C- H?N inter-actions generate S(5) ring motifs. In the crystal structure, the mol-ecules are linked by weak inter-molecular C- H?N and C- H?O inter-actions into a supra-molecular three-dimensional network in such a way that the nicotinonitrile units of neighboring mol-ecules are stacked in an anti-parallel manner along the c axis. The crystal is further stabilized by C- H?? inter-actions.
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    6-(4-Bromo-phenyl)-2-ethoxy-4-(4-ethoxyphenyl)nicotinonitrile
    (2010) Chantrapromma, S.; Fun, H.-K.; Suwunwong, T.; Padaki, M.; Isloor, A.M.
    The mol-ecule of the title nicotinonitrile derivative, C22H 19BrN2O2, is non-planar, the central pyridine ring making dihedral angles of 7.34 (14) and 43.56 (15) with the 4-bromophenyl and 4-ethoxyphenyl rings, respectively. The ethoxy group of the 4-ethoxyphenyl is slightly twisted from the attached benzene ring [C-O-C-C = 174.2 (3) ], whereas the ethoxy group attached to the pyridine ring is in a (+)syn-clinal conformation [C-O-C-C = 83.0 (3) ]. A weak intra-molecular C-H?N inter-action generates an S(5) ring motif. In the crystal structure, the mol-ecules are linked by weak inter-molecular C-H?N inter-actions into screw chains along the b axis. These chains stacked along the a axis. ?-? inter-actions with centroid-centroid distances of 3.8724 (16) and 3.8727 (16) are also observed.
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    6-(4-Bromo-phenyl)-2-ethoxy-4-(4-ethoxyphenyl)nicotinonitrile
    (2010) Chantrapromma, S.; Fun, H.-K.; Suwunwong, T.; Padaki, M.; Isloor, A.M.
    The mol-ecule of the title nicotinonitrile derivative, C22H 19BrN2O2, is non-planar, the central pyridine ring making dihedral angles of 7.34 (14) and 43.56 (15)° with the 4-bromophenyl and 4-ethoxyphenyl rings, respectively. The ethoxy group of the 4-ethoxyphenyl is slightly twisted from the attached benzene ring [C-O-C-C = 174.2 (3)°], whereas the ethoxy group attached to the pyridine ring is in a (+)syn-clinal conformation [C-O-C-C = 83.0 (3)°]. A weak intra-molecular C-H?N inter-action generates an S(5) ring motif. In the crystal structure, the mol-ecules are linked by weak inter-molecular C-H?N inter-actions into screw chains along the b axis. These chains stacked along the a axis. ?-? inter-actions with centroid-centroid distances of 3.8724 (16) and 3.8727 (16) Å are also observed.
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    6-(4-Bromophenyl)-2-eth-oxy-4-(2,4,5-trimethoxyphenyl)nicotinonitrile
    (2010) Chantrapromma, S.; Fun, H.-K.; Padaki, M.; Suwunwong, T.; Isloor, A.M.
    There are two mol-ecules in the asymmetric unit of the title compound, C23H21BrN2O4, which differ in the conformation of their ethoxy residues, i.e. almost co-planar with the pyridine ring in one mol-ecule [C - O - C - C = -174.0 (2) ] but almost perpendicular in the other [C - O - C - C = 92.8 (3) ]. The dihedral angles between the central pyridine ring and the 4-bromo-phenyl and 2,4,5-trimethoxy-phenyl rings are 11.05 (12) and 63.78 (12) , respectively, in one mol-ecule; the corres-ponding angles in the other mol-ecule are 30.38 (13) and 65.38 (13) , respectively. In the crystal structure, pairs of mol-ecules are arranged in a face-to-face sandwich structure which further stacks along the b axis. The crystal packing features C - H?? inter-actions and Br?O [3.5417 (17) ], Br?C [3.748 (3) ], C?N [3.376 (4) ] and C?O [3.351 (3)-3.409 (3) ] contacts. Finally, ??? inter-actions [centroid?centroid distances = 3.6346 (19) and 3.6882 (19) ] are observed.
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    6-(4-Bromophenyl)-2-eth-oxy-4-(2,4,5-trimethoxyphenyl)nicotinonitrile
    (2010) Chantrapromma, S.; Fun, H.-K.; Padaki, M.; Suwunwong, T.; Isloor, A.M.
    There are two mol-ecules in the asymmetric unit of the title compound, C23H21BrN2O4, which differ in the conformation of their ethoxy residues, i.e. almost co-planar with the pyridine ring in one mol-ecule [C - O - C - C = -174.0 (2)°] but almost perpendicular in the other [C - O - C - C = 92.8 (3)°]. The dihedral angles between the central pyridine ring and the 4-bromo-phenyl and 2,4,5-trimethoxy-phenyl rings are 11.05 (12) and 63.78 (12)°, respectively, in one mol-ecule; the corres-ponding angles in the other mol-ecule are 30.38 (13) and 65.38 (13)°, respectively. In the crystal structure, pairs of mol-ecules are arranged in a face-to-face sandwich structure which further stacks along the b axis. The crystal packing features C - H?? inter-actions and Br?O [3.5417 (17) Å], Br?C [3.748 (3) Å], C?N [3.376 (4) Å] and C?O [3.351 (3)-3.409 (3) Å] contacts. Finally, ??? inter-actions [centroid?centroid distances = 3.6346 (19) and 3.6882 (19) Å] are observed.