Add time:07/23/2019         Source:sciencedirect.com

Four copper(II) complexes (1–4) and a cobalt(II) complex (5) derived from 4-bromo-2-(hydroxymethyl)pyridine (L1) or 5-bromo-2-hydroxymethyl)pyridine (L2) with Cu(NO3)2·3H2O, CuCl2·2H2O and CoCl2·6H2O have been synthesized and their respective crystal structures studied. They show specific influences owing to the different kind of metal cations and counter anions, the hydration as well as the different position of the bromine substitution on both the coordination of the complex unit and the network structure of the crystal lattice. The Cu(II) complexes of L1 are five-coordinate [Cu(L1)2NO3]NO3·H2O (1) and [Cu(L1)2Cl]Cl·H2O (2) species with distorted quadratic pyramidal and trigonal bipyramidal coordination geometries of the N2O3 and N2O2Cl donor atoms around the Cu(II), respectively. The Cu(II) complexes of L2 are six-coordinate [Cu(L2)2(NO3)2] (3) and [Cu(L2)2Cl(H2O)]Cl·H2O (4) species with distorted octahedral coordination geometries of the N4O2 and N2O3Cl donor atoms. A distorted octahedral coordination geometry of the N2O2Cl2 donor atoms is also found in the complex unit [Co(L2)2Cl2] of the Co(II) complex 5 but showing the oxygen atoms of the chelating ligand as well as the chloride ions in a cis-position. Depending on the complex, water molecules and chloride anions are shown to act as stabilizing components of the crystal structure. The comparative structural investigation includes also known structures of the bromine-free ligand analogue 2-(hydroxymethyl)pyridine, illustrating the basic implication of the bromine substitution, mostly perceptible in the different modes of crystal packing.

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