Two novel lanthanum-tartrate complexes with distinctive new topologies: Hydrothermal synthesis and crystal structures

Two novel lanthanum-tartrate complexes exhibiting distinctive new topologies, namely [La(TTA)(1.5)(H2O)]center dot H2O (1) and [La-2(TTA)(3)(H2O)(3)]center dot 2H(2)O (2) (H(2)TTA = tartaric acid), respectively, were obtained by the reactions of the lanthanum-oxide with corresponding H(2)TTA under hydrothermal conditions. In complex 1, the 2D layer consisted of mu(4)-ligands and four-connected La(III) centers is the first example of uninodal net of (4(2).6(4)) topology. The 2D layers are further connected by mu(2)-TTA(2) ligands to give a 3D (4(2).6(4))(4(2).6(7).8) topological structure. Complex 2 is a new 3D unprecedented five-nodal net of (4.6(2))(4.6(4).8(4).10)(4.6(4).8)(4.8(2))(6.3) topology, which is constructed by regular (6,3) nets. In both complexes, La(III) atoms act as rare five-connected topological blocks. The structural diversity of 1 and 2 was caused by the different chiralities of the starting H(2)TTA ligands. (C) 2010 Elsevier B.V. All rights reserved.