Three new copper(II) halides with simple pyridine alcohols

Abstract

Three Cu(II) halido complexes of 3-pyridinepropanol (3-pyprop), 2-pyridineethanol (2-pyet), and 2-pyridinemethanol (2-pymet) have been prepared and investigation of their crystal structures undertaken. All the reported products contain simple pyridine alcohols as neutral ligands. Cu(3-pyprop) 2 Br 2 , 1, exhibits squareplanar coordination geometry with the axial sites involved in weak bridging contact with the neighboring units to form infinite chains. Reaction of CuBr 2 with 2-pyet leads to an ionic complex [Cu(2-pyet) 2 Br]Br, 2, with distorted squarepyramidal coordination environment: the Cu center in the cation is surrounded by two 2-pyet ligands, coordinated in chelating manner, and a bromide. Reaction of CuCl 2 with 2-pymet resulted in the formation of a dinuclear ionic complex Cu 2 (2-pymet) 4 Cl 2 ]Cl 2 Á2H 2 O, 3. The centrosymmetric cation consisted of two Cu ions doubly bridged by chlorides and coordinated by chelating 2-pymet ligands. The positive charge is balanced by free chlorides involved in hydrogen bonds with the lattice water molecules.

Bromidobis[2-(pyridin-2-yl)methanol-κ2N,O]copper(II) bromide monohydrate

“…The preparation of coordination polymers remains an attractive field of research in coordination chemistry. We have been interested for some time in the use of simple pyridyl-substituted alcohols as organic linker ligands (Lah et al, 2006;Lah & Leban, 2010;Lapanje et al, 2012;Trdin & Lah, 2012). While preparing new Cu II complexes with 2-(pyridin-2-yl)methanol (2-pyMeOH) and various carboxylic acids, the reaction with CuBr 2 was carried out in methanol.…”

“…In a comparison of the structure of (I) with those of known ionic halide complexes of transition metals with simple pyridine alcohols, six structures need to be mentioned. Three Cu II complexes are reported as mononuclear ionic compounds with the stoichiometry [CuXL 2 ]X: X = Cl and L = 2-pyMeOH (Antonioli et al, 2007), X = Cl and L = 2-pyEtOH (Hamamci et al, 2004), and X = Br and L = 2-pyEtOH (Lah & Leban, 2010). All three crystallize as anhydrous compounds and contain cations with a similar arrangement of ligands around the Cu II centre.…”

Cyanide-bridged manganese(II) and chloride-bridged copper(II) complexes with 2-pyridineethanol: synthesis, structural characterization and C-H⋯M interactions

“…The 2-pyridineethanol can react as an anionic ligand (with its hydroxyl group being deprotonated) or as neutral ligand with the preserved OH [29].…”

1D cyanide complexes with 2-pyridinemethanol: Synthesis, crystal structures and spectroscopic properties

“…2-pyridinemethanol possesses two functions such as a pyridine N-atom, which usually coordinates to the metal center and a potentially bridging alcohol function [21]. Moreover, 2-pyridinemethanol has chelating ability with a transition metal.…”