Three isomorphous Ln complexes: {[Ln2(bt)6(bno) (H2O)4]·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 - but-2-enoato- 3 O:O,O′;3 O,O′:O′-bis-[diaqua-dibut-2- enoato-O;2 O,O′-neodymium(III)]] - 4,4′-bipyridyl N,N′-dioxide-2 O:O′] 4,4′-bipyridyl N,N′-dioxide solvate] and the erbium(III) and yttrium(III) analogues, {[Ln2(C4H5O2)6(C10H8N2O2)(H2O)4]·C10H8N2O2} n (Ln = Nd, Er and Y), form from [Ln2(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 inter-connected by aqua-mediated hydrogen bonds into broad two-dimensional structures, which in turn inter-act with each other though the hydrogen-bonded bridged bno solvent units. Both independent bno units in the structures are bisected by symmetry centres. © International Union of Crystallography 2007.