The Crystal structures of three adducts of lanthanide nitrates, water and 4,4′-bipyridyl: [La 2(H 2O) 7(NO 3) 6]·4C 10H 8N 2, [Ho(H 2O) 3(NO 3) 3]·2C 10H 8N 2 and [Y(H 2O) 3(NO 3)·2C 10H 8N 2

Abstract

Three classes of adducts of aqua-nitratolanthanide complexes and 4,4′-bipyridyl (4-bipy) have been structurally characterised: (1) [Ln 2(H 2O) 7(NO 3) 6]· 4(4-bipy), Ln = La, Ce(III), Pr; (2) [Ln(H 2O) 3(NO 3) 3]·2(4-bipy), Ln = Y, Ho; (3) [Ln(H 2O) 3(NO 3) 3]·2(4-bipy), Ln = Y, Nd, Sm, Eu, Gd, Tb, Dy, Ho. In all cases, nitrate groups are bidentate, and 4-bipy molecules are un-protonated and un-coordinated and are hydrogen-bonded to ligand water molecules. in (1), a doubly-bidentate NO 3 group bridges two Ln atoms. Crystal data include: (1) (Ln = La). Cmc2 1, a = 24.52(2), b = 16.673(12), c = 13.245(8) Å, Z = 4, diffractometer data, R = 0.094 for 3241 reflections; (2) (Ln = Ho), Pbca, a = 7.731(7), b = 43.77(8), c = 15.67(3) Å, Z = 8, film data, R = 0.060 for 2124 reflections; (3) (Ln = Y), P2 1/c, a = 7.910(6), b = 20.81(2), c = 16.56(2) Å, β = 104.60(5)°, film data, R = 0.058 for 2820 reflections.