The reactions of Mn(II), Fe(II), Co(II), Ni(II), Cu(II), and Cd with 2,3-dihydroxyquinoline (H
2L) were used to synthesize and identify the complexes M(HL)
2 · 2H
2O (M = Mn, Ni, Cu), Fe(HL)OH · 2H
2O, Co(HL)OH · H
2O, Cd(H
2L)Cl
2, where H
2L participates in the coordination in the monoanionic or neutral forms with the formation of the chelate cycles. Single crystal
was isolated and the crystal structure of H
2L was determined. The spectral characteristics of a neutral and anionic form of the ligand were measured, and its complexation
with MCl
2 was studied in the ethanol solutions. The acidity constant of H
2L and the formation constants of the complexes in solutions were calculated.
Original Russian Text © S.B. Strashnova, O.V. Kovalchukova, B.E. Zaitsev, A.I. Stash, 2008, published in Koordinatsionnaya
Khimiya, 2008, Vol. 34, No. 10, pp. 783–787.