Coordination studies of copper(II), cobalt(II) and iron(II) with isomeric pyridyl-tetrazole ligands

Coordination reactions of 2-(6″-bromohexyl)-(1-tetrazol-5-yl)pyridine (L2) and 2-(6″-bromohexyl)-(2-tetrazol-5-yl)pyridine (L3) with CuCl2·2H2O, Co(SCN)2 and Fe(ClO4)2·H2O yielded strongly coloured solids [Cu(II)(L2)Cl2]2 (1), [Cu(II)(L3)Cl2]2 (2), [Co(II)(L2)2(NCS)2] (3), [Co(II)(L3)2(NCS)2] (4), [Fe(II)(L2)2(H2O)2](ClO4)2 (5) and [Fe(II)(L3)2(H2O)2](ClO4)2 (6), containing high-spin metal centres for the Co(II) and Fe(II) compounds. X-ray crystal structures were obtained for complexes 1-5.