Cyanide-Bridged Manganese(II) and Chloride-Bridged Copper(II) Complexes with 2-Pyridineethanol: Synthesis, Structural Characterization and C-H⋯M Interactions

Abstract

[Mn(hepH)<inf>2</inf>Ni(μ-CN)<inf>2</inf>(CN)<inf>2</inf>]<inf>n</inf> (1) and [Cu<inf>2</inf>(μ-Cl)<inf>2</inf>(μ-hep)<inf>2</inf>]<inf>n</inf> (2) (2-pyridineethanol abbreviated to hepH) have been synthesized and characterized by FT-IR and Raman spectroscopies, elemental analyses, and single-crystal X-ray diffraction. X-ray single-crystal structure analysis reveals that the structures of 1 and 2 consist of 1-D infinite chains. The coordination environment of Mn(II) was identified as distorted octahedral, whereas Ni(II) has a square planar geometry in 1. Each Cu(II) in 2 adopts a distorted square pyramidal geometry in which the basal plane is constructed by oxygen and nitrogen atoms from hep and a bridging chloride ligand, respectively, and the apical position is occupied by the other chloride. The 1-D chains in 1 and 2 are extended into a 2-D supramolecular network by O-H⋯N and weak C-H⋯Cl hydrogen bonds, respectively. Adjacent 2-D layers are further connected by C-H⋯M interactions resulting in the formation of 3-D supramolecular networks. The most remarkable properties of complexes are the presence of close C-H⋯M interactions with distance values of 2.58 and 2.93 Å between H⋯Ni and H⋯Cu, respectively. The H⋯Ni interaction distance is shorter than the corresponding values of other tetracyanonickelate(II) complexes. (Chemical Equation Presented). © 2016 Informa UK Limited, trading as Taylor & Francis Group.