Structures of catena-di-μ-chloro- and catena-di-μ-bromo-(2,2-bipyridine)copper(II)

Crystal engineering of coordination polymers and architectures using the [Cu(2,2′-bipy)]2+ molecular corner as building block (bipy = 2,2′-bipyridyl)

“…The parent compound is a one-dimensional polymer comprised of Cu(2,2'-bipy)Cl 2 square planar units joined in the apical positions to adjacent units via weak Cu±Cl interactions. 13 Elimination of the chlorides creates a`90³ metal corner' that can form two stronger bonds in the equatorial directions trans to the N atoms of the 2,2'-bipy ligand and one or two weaker interactions (with the anions or solvent molecules) in the axial directions, due to Jahn±Teller distortions. In other words, 1 could be considered as a pseudo-square planar building block, playing a structural role similar to that of the cis-platinum or cis-palladium square planar species widely employed for the construction of metalbased supramolecular architectures.…”

Transformation of a CuII Thiazolo‐1,2,4‐triazine Derivative from a Metastable Coordination Network to a Monomer in Solution and Vapor Conditions

“…Several network types, III, IV, and V of bis(μ-chloro)Cu 2+ complexes have been reported and the linear type III is well known; (CuCl 2 L 2 ) n [33,34] and (Cu 2 Cl 4 L 2 ) n . [14,35] The ladder formation of IV and the zigzag formation of type V have also been reported (CuCl 3 LЈ) n (LЈ = N 2 H 5 [36] ) and (CuCl 2 LЈЈ) n [LЈЈ = bipyridine [37] or di(2-pyridyl) ketone [38] ], respectively, where two bidentate ligands L ЈЈ are coordinated to each Cu 2+ ion. In this work, the geometry around the Cu 2+ center in 5a is type II, and, to the best of our knowledge, the network formed is new and classified as type VI (Figure 3, b).…”

Di-μ-chloro-bis[(2,2-bipyridine)chlorocopper(II)]

“…Complexes of the general formula Cu(NN)X 2 (X = CI and Br, and NN = a dinitrogen chelate) are known to have different geometries with the coordination number of the copper atom varying from four to six. Particular attention has been devoted to polymeric Cu II complexes with chlorides and substituted bipyridines as ligands (Garland et al, 1988;Hernandez-Molina et al, 1999;Wang et al, 2004).…”