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(C4H4O4)1.5(H2O)2] · H2O}n (1), and poly[[ μ -aqua-aqua( μ 3-butane-1,4-dicarboxylato)( μ -butane-1,4-dicarboxylato)- μ -oxido-dibismuth] monohydrate], {[Bi2(C4H4O4)2O(H2O)2] · H2O}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 (C4H4O42 − ) in two different conformations (trans and gauche) are included in their composition. The Bi3+ cations are surrounded by O atoms from the carboxylate groups of succinate anions and aqua ligands. BiO9 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 (BiO9 and BiO7) in 2 are connected by edges to form infinite ribbons. Ribbons of polyhedra with bridging succinate ligands form a 3D polymeric structure.

Source: Acta Crystallographica Section C - September 21, 2023 Category: Chemistry Authors: Timakova, E.V. Afonina, L.I. Drebushchak, T.N. Zakharov, B.A. Tags: bismuth compound crystal structure succinic acid active pharmaceutical ingredient API IR spectroscopy Raman spectroscopy thermal analysis research papers Source Type: research