Complexes of 2,3-dihydroxypyridine with bivalent metals. Crystal structure of 2,3-dihydroxypyridine

Crystal structure of 2,3-dihydroxypyridine (H2L) is determined. Mn(HL)Cl . H2O, Co(HL)Cl . 2H(2)O, Cu(HL)Cl, Ni(HL)OH . H2O, and Zn(HL)OH . H2O complexes are synthesized by reacting Mn(II), Co(II), Ni(II), Cu(II), and Zn(II) chlorides with H2L in ethanol solutions and identified. In these complexes, 2,3-dihydroxypyridine is involved in coordination as a monoanion. Spectral parameters of neutral and anionic forms of a ligand are determined and the acidity and complex formation constants are calculated. The compositions of complexes are established.