The crystal structure of bis-[(E)-4-bromo-2-({[2-(pyridin-2-yl)eth-yl]imino}-meth-yl)phenol]nickel(II) bis-[(E)-4-bromo-2-({[2-(pyridin-2-yl)eth-yl]imino}-meth-yl)phenolato]nickel(II) bis(perchlorate) methanol monosolvate, a structure containing strong inter-species hydrogen bonds

The title compound, [Ni(C14H12BrN2O)2][Ni(C14H13BrN2O)2](ClO4)2·CH3OH consists of two mononuclear ([Ni(HL)2]2+ and [NiL2]) complex mol-ecules linked by strong hydrogen bonding [O⋯O separations of only 2.430 (5) Å], which is the shortest reported to date for such species. In one of the complexes, both the coordinated phen-oxy groups retain their protons and thus this is the cationic equivalent species of the other complex where both coordinated phen-oxy groups are deprotonated. In addition, perchlorate anions are present for charge balance, as well as methanol solvate mol-ecules. For the neutral NiL2 complex, each 2-ethyl-amine-pyridine arm is disordered over two equivalent conformations with occupancies of 0.750 (8):0.250 (8). The perchlorate anion is disordered over two equivalent conformations with occupancies of 0.602 (8):0.398 (8). The perchlorate ions also link to the H atoms on the methanol methyl and hydroxyl groups. These inter-actions link the moieties into a complex three-dimensional array. The crystal studied was refined as a two-component twin.

Bis{[2,2'-(5,8,11-tri-thia-2,14-di-aza-penta-deca-1,14-diene-1,15-di-yl)diphenolato]palladium(II)} aceto-nitrile monosolvate

The asymmetric unit of the title compound, [Pd(C₂₂H₂₆N₂O₂S₃)]₂·CH₃CN, contains two complex mol­ecules and a single uncoordinated lattice aceto­nitrile solvent mol­ecule. The Pd^II cations have a trans-N₂O₂ square-planar geometry and the superposition of the two crystallographically independent Pd^II complexes yields an overall r.m.s. deviation of 0.292 Å. The Pd⋯Pd separation in the asymmetric unit is 3.3776 (3) Å, while the PdN₂O₂ plane–plane fold angle is 1.62 (7)°. A short inter­molecular S⋯S contact between the central S atom of one complex and its inversion-related symmetry equivalent of 3.663 (2) Å is observed. Part of the ligand chain (S—C—C—S) in each complex mol­ecule is disordered over two orientations and refined occupancies that converged to 0.450 (10) and 0.550 (10) for the one complex mol­ecule, and 0.789 (9) and 0.211 (9) for the other.