CHÉLATES DU GERMANIUM (IV) AVEC LA TROPOLONE, LE MALTOL, LA LAWSONE ET LA TRICHLOROHYDROXY p-BENZOQUINONE: II. NATURE ET STABILITÉ DES CHÉLATES

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Abstract
The formation of chelates between germanium (IV) and a series of α-hydroxyketones (HL) has been examined spectrophotometrically. Tropolone and maltol have been shown to give the species Ge(OH)2L2 and GeL3+; the corresponding equilibrium constants β2 and β3 have been determined. The following solid compounds have been isolated: Ge(OH)2(tropolonate)2•2H2O, Ge(tropolonate)3ClO4, and Ge(maltolate)3ClO4. There was no evidence of complex formation with lawsone and trichlorohydroxy p-benzoquinone. Relations are discussed between the chelate stability, the state of germanium (IV) in solution, and the acid–base properties of the α-hydroxyketones.