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In the title compound, [ZnI2(C34H31N3)], the ZnII atom is four-coordinated by two I atoms and the pyridine N atoms from the bidentate 6'-phenyl-2,2'-bi­pyridine ligand in a distorted tetra­hedral geometry.

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There are two independent mol­ecules in the asymmetric unit of the title mol­ecule, C8H9N3S2, both of which exhibit an E conformation with the pyridine ring and di­thio­carbazate fragment located on opposite sides of the C=N bond. The pyridine ring and di­thio­carbazate group are approximately coplanar, with dihedral angles of 4.74 (1) and 8.77 (1)° between their planes in the two mol­ecules. In the crystal, mol­ecules are linked to each other via N—H...N hydrogen bonds, forming zigzag chains parallel to [10-1].

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In the title mol­ecule, C24H26N4, the pyrazoline ring assumes an envelope conformation with the aniline-bearing C atom at the flap position. The benzene ring and the pyridine ring form with the pyrazoline ring dihedral angles of 4.53 (1) and 6.26 (1)°, respectively. In turn, the aniline group is nearly perpendicular to the pyrazoline ring [dihedral angle = 79.96 (1)°]. The ethyl groups of the di­ethyl­amine substituent are disordered over two sets of sites, with an occupancy ratio of 0.624 (8):0.376 (8).

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In the title compound, C19H15N3O2·H2O, the oxa­diazole ring and the quinoline unit are almost coplanar, making a dihedral angle of 7.66 (8)°. The dihedral angle between the benzene ring and the quinoline system is 25.95 (8)° while that between the benzene and the oxa­diazole rings is 18.88 (9)°. The water mol­ecule is hydrogen bonded to an oxa­diazole N atom and to the quinoline N atom. In the crystal, these units are linked via C—H...O hydrogen bonds, forming two-dimensional net­works lying parallel to the ab plane.

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In the title compound, C34H28N2S2, the central imidazole ring (r.m.s. deviation = 0.0015 Å) forms dihedral angles of 55.7 (3), 17.94 (11) and 86.27 (11)°, respectively, with the mean planes of the attached thienyl and two phenyl substituents. The thienyl ring shows ring-flip disorder [occupancy ratio = 0.647 (2):0.353 (2)]. The chiral centre maintains the S configuration of the L-phenyl­alaninol starting material. Intra- and inter­molecular C—H...S hydrogen bonds involving the disordered thienyl ring are observed.
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