Synthesis and structures of 3,30-azobispyridine copper(II) complexes with ClO4 2, BF4 2 and SiF6 22 anions

The complexes {[Cu(3,30-azpy)3(H2O)2](ClO4)2(H2O)2}n (1), {[Cu(3,30-azpy)3(H2O)2](BF4)2(H2O)2}n (2) and {[Cu(3,30-azpy)(H2O)4] (SiF6)(H2O)2}n (3) (3,30-azpy ¼ 3,30-azobispyridine) were synthesized. The crystal structures show that one-dimensional helical chains [Cu(3,30-azpy)3(H2O)2]are formed and the helical chains are organized into three-dimensional molecule networks by hydrogen bonding and p–p stacking interactions in 1 and 2. The zigzag chains {[Cu(3,30-azpy)(H2O)4]}n 2nþ are formed in 3. The zigzag chains are further linked into the three-dimensional network through the hydrogen bond interactions. q 2004 Elsevier B.V. All rights reserved.