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Rapid Reactions of Phthalocyanines with Tellurium Tetrachloride in Non-aqueous Solutions

YUTAKA KAGAYA

National Research Institute for Metals, 1-2-1 Sengen, Tsukuba-shi, Ibaraki 305-0047, Japan

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HIROAKI ISAGO

National Research Institute for Metals, 1-2-1 Sengen, Tsukuba-shi, Ibaraki 305-0047, Japan

Corresponding author: National Research Institute for Metals, 1-2-1 Sengen, Tsukuba-shi, Ibaraki 305-0047, Japan.

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https://doi.org/10.1002/(SICI)1099-1409(199908/10)3:6/7<537::AID-JPP172>3.0.CO;2-2Cited by:8 (Source: Crossref)

Abstract

Rapid reactions of tetra(tert-butyl)phthalocyanine, H₂(tbpc), and its zinc complex, [Zn(tbpc)], with tellurium tetrachloride (TeCl₄) in non-aqueous solutions have been investigated. Upon mixing respective solutions containing the reactants, drastic spectral changes occurred in chloroform and toluene even at room temperature. The electronic spectra of the products indicated that the reactions involved an acid-base equilibrium where the phthalocyanines and tellurium tetrachloride acted as a Lewis base and a Lewis acid respectively. By monitoring the spectral changes based on various initial molar ratios of the reactants, the compositions of the products for each system have been determined. [Zn(tbpc)] formed a 1:1 (tbpc:TeCl₄) adduct in both chloroform and toluene, showing the same spectra close to those of the known monoprotonated phthalocyanines. On the other hand, H₂(tbpc) formed a 1:1 adduct in chloroform but a 1:3 adduct in toluene even though both products showed essentially the same spectra close to those of the known diprotonated phthalocyanines. Equilibrium constants have been calculated for the four systems. Magnetic circular dichroism (MCD) spectra of conjugated acids of phthalocyanines have been studied for the first time.

Paper presented at 2nd International Symposium on Phthalocyanines, Edinburgh, September 1998.

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