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The title compound, [HgCl2(C14H12N2)], consists of one 2,9-dimethyl-1,10-phenanthroline (dmphen) ligand chelating the HgII ion and two chloride ligands coordinating to the HgII ion, forming a distorted tetra­hedral environment. The dmphen ligand is nearly planar (r.m.s. deviation = 0.0225 Å). The dihedral angle between the normal to the plane defined by the HgII atom and the two Cl atoms and the normal to the plane of the dmphen ring is 81.8 (1)°.

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In the title compound, C15H14O3, the dihedral angle between the benzene rings is 75.85 (7)°. In the crystal, centrosymmetrically related mol­ecules are weakly associated through pairs of inter­actions between a benzene ring and an O atom of the ester group [ring centroid...O = 3.952 (7) Å], and through pairs of inter­actions between the other benzene ring and an O atom of the phen­oxy group [ring centroid...O = 3.912 (7) Å], giving chains extending along [110].

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In the title racemic Schiff base ligand, C20H20Cl2N2, which was prepared by the condensation of 2-chloro­benzaldehyde and cyclo­hexane-1,2-di­amine, the cyclo­hexane ring adopts a chair conformation and the dihedral angle between the aromatic rings of the 2-chloro­phenyl substituent groups is 62.52 (8)°. In the structure, there are two short intra­molecular methine C—H...Cl inter­actions [C...Cl = 3.066 (2) and 3.076 (3) Å], and in the crystal there are also weak inter­molecular aromatic C—H...Cl [3.464 (3), 3.553 (3) and 3.600 (3) Å] and Cl...Cl [3.557 (3) and 3.891 (3) Å] contacts.

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There are two independent mol­ecules in the asymmetric unit of the title compound, C12H9ClN2OS, a Schiff base derived from hydrazide, in which the dihedral angles between the thio­phene and benzene rings are 3.6 (3) and 7.3 (3)°. In the crystal, the two independent mol­ecules are arranged about an approximate non-crystallographic inversion center and are connected by two N—H...O hydrogen bonds. Weak C—H...Cl contacts are also present. Conversely, there are neither significant aromatic stacking inter­actions nor contacts involving S atoms.
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