Interaction of zinc(II) tetra-tert-butyl-phthalocyaninate with organic ligands in solution

Author： Lebedeva N.   Mal’kova E.   Pavlycheva N.   V’ugin A.  

Publisher： MAIK Nauka/Interperiodica

ISSN： 1070-3284

Source： Russian Journal of Coordination Chemistry, Vol.30, Iss.12, 2004-12, pp. : 864-867

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Abstract

Calorimetric titration was used to obtain standard thermodynamic characteristics of zinc(II) tetra-tert-butyl-phthalocyaninate interaction with electron-donor ligands in benzene. The formation of molecular complexes of Zn(t-Bu)4Pc with ligands (hexamethylphosphoramide, pyridine, piperidine, and morpholine) was found to be greatly affected both by the electron-donor and polarization properties of the coordinated ligands, as well as by the solvation effect of a medium. It was shown that the formation of thermodynamically stable molecular complexes of zinc(II) tetra-tert-butyl-phthalocyaninate with the electron-donor solvents (with stability constant Ks > 104) favors the formation of α-polymorphic modification of a metal phthalocyaninate during its crystallization from a given solvent.

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