A ternary metal complex involving Vitamin B6with the formula [Cu(bipy)(pn) (OH)]H2O (bipy = 2,2′-bipyridine, pn = anionic pyridoxine) has been synthesized and studied in the solid state by means of spectroscopy and X-ray crystallography. The geometry around copper(II) is distorted square pyramidal, two oxygens from phenolic and 4-(hydroxymethyl) groups of pn, two nitrogens from bipy and an axial OH-ion forming the coordination sphere. In this structure pn exists in a new anionic form with deprotonation of the phenolic group. The structure also provides a rare example of monodentate hydroxyl coordination to copper. © 1992.
Mathews, I. I., Rao, S. P. S., & Nethaji, M. (1992). X-ray crystal structure of a ternary copper(II) vitamin B6complex, hydroxo(2,2′-bipyridyl)(pyridoxinato) copper(II) monohydrate. A rare example of monodentate coordination of copper(II) by the hydroxyl ion. Polyhedron, 11(11), 1397–1401. https://doi.org/10.1016/S0277-5387(00)83372-0