Abstract
The complex Cd(pyridoxine)Cl 2 crystallizes in space group P2 1/ c with a = 9.279(2), b = 7.289(3), c = 17.845(6) A ̊ and ß = 114.36(2) A ̊ . The crystal structure has been determined using four-circle diffractometer data recorded at 24°C and refined by full matrix least-squares calculations to R = 0.048. It consists of infinite chains Cd-bridge-Cd. The Cd atom, in an octahedral environment, is bound to three chlorine atoms and three oxygen atoms of the ligand. Two chlorine atoms make a double bridge between two equivalent cadmium atoms. The pyridoxine molecule acts as a bidentate ligand through two oxygen atoms and as a bridge between two equivalent atoms. Moreover, the Cd 2+ influence on B 6 vitamin 13C NMR spectra has been investigated in aqueous solution. At pH ∼ 7, the pyridoxine reacts with the metallic ion as a zwitterion to give a 1.1 chelate. These results are in perfect agreement with the radiocrystallographic study.
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