Construction of lanthanide(III) coordination polymers with 1,2-bis(4-pyridyl) ethane-N, N′-dioxide and trans-1,2-bis(4-pyridyl)ethene-N, N′-dioxide

Four lanthanide(III) complexes {[Ce(L-1)(1.5)(NO3)(3)](CH2Cl2)(0.25)(H2O)(0.25)}(infinity) 1, [Ln(L-2)(1.5)(NO3)(3)](infinity) (Ln = Ce, 2; Gd, 3), and [Yb(L-2)(CH3OH)(NO3)(3)](infinity) 4 have been synthesized using 1,2-bis(4-pyridyl)ethane-N,N'-dioxide (L-1) and trans-1,2-bis(4-pyridyl)ethene-N, N'-dioxide (L-2). Bridged by the flexible L-1 ligand to form binuclear Ce2O2 units, compound 1 shows a three-dimensional network with triangular and distorted square channels. The isomorphous pair 2 and 3 composed of rigid L-2 linkers and Ln(2)O(2) units (Ln = Ce, Gd) exhibit a layered structure of (4,4) topology. In compound 4, the mononuclear Yb(III) ions arc bridged by L-2 ligands to generate a sinuous chain. (C) 2003 Elsevier Ltd. All rights reserved.