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Organic Chemistry, Inorganic and nuclear chemistry
The reaction of 2-(2H-tetrazol-5-yl)pyridine (L1) with 1,n-dibromoalkane (n = 3, 4, 6 or 8) results in the formation of the isomers 2-(n′′-bromoalkyl-(1-tetrazol-5-yl)pyridine (L2A-D) and 2-(n′′-bromoalkyl-(2-tetrazol-5-yl)pyridine (L3A-D). The reaction of L1 with 1-bromoalkanes also resulted in the formation of isomeric materials, namely 2-(n′′-alkyl-(1-tetrazol-5-yl)pyridine (L4A-C) and 2-(n′′-alkyl-(2-tetrazol-5-yl)pyridine (L5A-C). Complexation reactions of these ligands with the transition metal salts CuCl2.2H2O, Co(NCS)2, NiCl2.2H2O and ZnCl2 were carried out in methanol and resulted in complexes containing a 1:1 metal:ligand stoichiometry except in the cases of the cobalt complexes where a 1:2 metal:ligand stoichiometry was obtained. The 1H NMR spectra of the zinc complexes showed that the ligands containing the pendant arm in the 2-N position of the tetrazole ring bind the zinc ion more strongly than those containing the pendant arm in the 1-N position. The X-ray structures of two cobalt salts, Co(L5A)2(NCS)2 and Co(L5C)2(NCS)2, are also discussed.
Kelleher, F., Sheridan, U. McGinley, J. Gallagher, J. and Fleming, A. Coordination studies of copper(II), nickel(II), cobalt(II) and zinc(II) salts with pyridyl–tetrazole ligands containing alkyl or alkyl halide pendant arms. Polyhedron Volume 59, 1 August 2013, Pages 8–16. doi.org/10.1016/j.poly.2013.04.025,