A. Bond, A. Fleming, Jackie Gaire
Feb 9, 2012
Citations
0
Influential Citations
22
Citations
Journal
Polyhedron
Abstract
Abstract The reaction of 2-(2H-tetrazol-5-yl)pyridine ( L1 ) with 1,6-dibromohexane results in formation of the isomers 2-(6″-bromohexyl)-(1-tetrazol-5-yl)pyridine ( L2 ) and 2-(6″-bromohexyl)-(2-tetrazol-5-yl)pyridine ( L3 ). Coordination reactions of L2 and L3 with CuCl 2 ·2H 2 O, Co(SCN) 2 and Fe(ClO 4 ) 2 ·H 2 O yielded the strongly coloured solids [Cu(II)( L2 )Cl 2 ] 2 ( 1 ), [Cu(II)( L3 )Cl 2 ] 2 ( 2 ), [Co(II)( L2 ) 2 (NCS) 2 ] ( 3 ), [Co(II)( L3 ) 2 (NCS) 2 ] ( 4 ), [Fe(II)( L2 ) 2 (H 2 O) 2 ](ClO 4 ) 2 ( 5 ) and [Fe(II)( L3 ) 2 (H 2 O) 2 ](ClO 4 ) 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 . In each complex, ligands L2 and L3 coordinate to the metal centre through the pyridyl N atom and the 1 - N site of the tetrazole ring, and the pyridyl–tetrazole ligand remains planar in all cases except 3 . Complexes 1 and 2 comprise a central Cu 2 Cl 2 dimeric core with Cu(II) in an essentially square-pyramidal coordination environment. Complexes 3 and 4 contain Co(II) in a distorted octahedral coordination environment. In 3 , the pyridyl and tetrazole rings of L2 are twisted with respect to each other and the complex adopts a puckered conformation in its equatorial plane. Complex 5 contains water molecules coordinated to Fe(II) in the axial sites, which form hydrogen bonds to the perchlorate counter anions.