Two new bismuth salts with succinic acid: synthesis, structural, spectroscopic and thermal characterization.

Two novel bismuth succinate hydrates, namely, poly[[diaqua(μ 3 -butane-1,4-dicarboxylato)hemi(μ-butane-1,4-dicarboxylato)bismuth] monohydrate], {[Bi(C 4 H 4 O 4 ) 1.5 (H 2 O) 2 ]·H 2 O} n (1), and poly[[μ-aqua-aqua(μ 3 -butane-1,4-dicarboxylato)(μ-butane-1,4-dicarboxylato)-μ-oxido-dibismuth] monohydrate], {[Bi 2 (C 4 H 4 O 4 ) 2 O(H 2 O) 2 ]·H 2 O} n (2), have been synthesized. Their crystal structures were determined by single-crystal X-ray diffraction and the compounds were characterized by IR and Raman spectroscopy, powder X-ray diffraction and thermal analysis. The crystal structure analysis revealed that the compounds are coordination polymers, with 1 having a two-dimensional layered structure and 2 displaying a three-dimensional (3D) framework. Fully deprotonated succinate anions (C 4 H 4 O 4 2- ) in two different conformations (trans and gauche) are included in their composition. The Bi 3+ cations are surrounded by O atoms from the carboxylate groups of succinate anions and aqua ligands. BiO 9 coordination polyhedra in 1 are connected in pairs by edges. These pairs are bound together by bridging succinate ligands to form layers. Bismuth coordination polyhedra of two different types (BiO 9 and BiO 7 ) in 2 are connected by edges to form infinite ribbons. Ribbons of polyhedra with bridging succinate ligands form a 3D polymeric structure.