Metal-dependent assembly of a tetranuclear copper(II) complex versus a 1D chain coordination polymer of cobalt(III) complex with N2O2-chelating Schiff-base ligand: Synthesis, characterization and crystal structures

By changing metal ions in the presence of N2O2-chelating Schiff-base ligand sal(2)hn [sal(2)hn = N,N'-bis(salicylidene)-1,2-diaminocyclohexane] and a large excess of NaN3 (reagent ratios (metal:L:N-3(-)) = 2:1:8), tetranuclear copper(II) complex [Cu-4(mu-sal(2)hn)(2)(mu(1.1)-N-3)(2)(N-3)(2)] (1) and 1D chain coordination polymer of cobalt(III) complex {Na[Co(mu-sal(2)hn)(mu(1.1)-N-3)(N-3)(H2O)(mu-O)}(n) (2) have been successfully obtained. Single-crystal X-ray analyses revealed that in complex 1 the copper(II) ions are bridged alternately by end-on (EO) azido and phenoxo-sal(2)hn ligands, while in complex 2 the cobalt(III) and sodium ions are bridged alternately by end-on (EO) azido and phenoxo-sal2hn ligands. Complex I crystallizes in the monoclinic system, space group P2(1)/n, with a = 11.6283(5)angstrom, b = 19.5997(8)angstrom, c = 9.1531(4)angstrom, beta = 90.540(6)degrees, V = 2086.00(15) angstrom(3), and Z = 2, while complex 2 crystallizes in the monoclinic system, space group C2(1)/c, with a = 21.1473(5) angstrom, b = 14.0604(3) angstrom, c = 15.0452(6) angstrom, beta = 106.064(3)degrees, V = 4298.9(2) angstrom(3), and Z = 8. (C) 2009 Elsevier Ltd. All rights reserved.