Three isomorphous Ln complexes: {[Ln(2)(bt)(6)(bno)(H2O)(4)]center dot bno}(n) (bt is but-2-enoate and bno is 4,4 '-bipyridyl N,N '-dioxide), with Ln = Nd, Er and Y

Abstract

The polymeric title compounds, namely catena-poly[[[di-mu-but- 2-enoato-kappa(3) O:O,O';kappa O-3,O':O'-bis[diaquadibut-2-enoato- kappa O;kappa O-2,O'-neodymium( III)]]-mu-4,4'-bipyridyl N,N'-dioxide- kappa(2) O:O'] 4,4'-bipyridyl N, N'-dioxide solvate] and the erbium(III) and yttrium(III) analogues, {[Ln(2)(C4H5O2)(6)(C10H8N2O2)(H2O)(4)]center dot-C10H8N2O2}(n) (Ln = Nd, Er and Y), form from [Ln(2)(bt)(6)-( H2O)(4)] dimers (bt is but-2-enoate) bridged by 4,4'-bipyridyl dioxide (bno) spacers into sets of parallel chains; these linear arrays are interconnected by aqua-mediated hydrogen bonds into broad two-dimensional structures, which in turn interact with each other though the hydrogen-bonded bridged bno solvent units. Both independent bno units in the structures are bisected by symmetry centres.