Synthesis and crystal structure of the coordination compound of pyridoxine with manganese sulfate

• Published in: Crystallography reports 2011-11, Vol.56 (6), p.1033-1037
• Main Authors: Furmanova, N. G., Verin, I. A., Shyityeva, N., Sulaimankulov, K. S., Berdalieva, Zh, Resnyanskii, V. F., Duishenbaeva, A. T.
• Format: Article
• Language: English
• Subjects: AQUEOUS SOLUTIONS; COMBUSTION; COMPLEXES; CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CRYSTALLIZATION; Crystallography and Scattering Methods; DECOMPOSITION; DEHYDRATION; LIGANDS; MANGANESE SULFATES; MONOCRYSTALS; Physics; Physics and Astronomy; PYRIDOXINE; Structure of Organic Compounds; SYNTHESIS; THERMAL GRAVIMETRIC ANALYSIS; TRICLINIC LATTICES; WATER; X-RAY DIFFRACTION
• ISSN: 1063-7745; 1562-689X
• DOI: 10.1134/S1063774511060095

The reaction of pyridoxine with manganese sulfate in an aqueous solution gave the coordination compound MnSO 4 · 2C 8 H 11 O 3 N · 2H 2 O ( I ). The structure of I was determined from single-crystal X-ray diffraction data. In the centrosymmetric complex (sp. gr. , Z = 1), the Mn atom is coordinated by two pyridoxine molecules and two water molecules, thus adopting an octahedral coordination. The sulfate anion is also at a center of symmetry and, consequently, is disordered. The pyridoxine molecules are coordinated to the metal atom through the oxygen atoms of the deprotonated hydroxyl group and the CH 2 OH group that retains the hydrogen atom. The nitrogen atom is protonated in such a way that the heterocycle assumes a pyridinium character. The crystal structure also contains six water molecules of crystallization. A thermogravimetric study showed that the decomposition of I occurs in several successive steps, such as dehydration, the combustion of organic ligands, and the formation of an inorganic residue.