Anindita Mukherjee

catena-Poly[[(triphenyl­phosphane)copper(I)]-di-μ-iodido-[(triphenyl­phosphane)copper(I)]-μ-{1,2-bis­[1-(pyridin-4-yl)ethyl­idene]hydrazine}]

In the title coordination polymer, [Cu2I2(C14H14N4)(C18H15P)2]n, the CuI atom is coordinated by two I atoms, one P atom and one N atom in a fairly regular tetrahedral arrangement. A crystallographic inversion centre generates a Cu2I2 diamond with a Cu–Cu separation of 3.0120 (5) Å. The complete N,N′-(1-pyridin-4-yl-ethethylidene)-hydrazine molecule is also generated by inversion symmetry, and this bridging ligand leads to [011] polymeric chains in the crystal structure.

Benzil bis­(ketazine)

The title compound (systematic name: 1,1′,2,2′-tetraphenyl-2,2′-azinodiethanone), C28H20N2O2, was obtained by the reaction of benzil monohydrazone with chromium(III) nitrate. The dibenzylidene hydrazine unit is nearly planar (r.m.s. deviation = 0.073 Å) and the two benzoyl units are oriented almost perpendicular to it [dihedral angle = 87.81 (2), 87.81 (2)°]. The molecules are linked into chains along the c axis by C—H⋯O hydrogen bonds and the chains are cross-linked via C—H⋯π interactions involving the benzoyl phenyl rings.

N,N′-Bis(4-pyridylmethyl­ene)octane-1,8-diamine

The complete molecule of the title compound, C20H26N4, is generated by a crystallographic centre of inversion and the central eight-carbon chain adopts a fully extended conformation. In the crystal, the molecules pack in layers parallel to (010).