Spectroscopic,electrocatalytic, and photoelectrochemical characteristics of mixed-ligand bis(β-dicarbonylato) phthalocyanine complexes of zirconium(IV) and hafnium(IV)

The electronic absorption (EAS) and fluorescence spectra and electrocatalytic and photoelectrochemical characteristics of mixed-ligand complexes of zirconium(IV) and hafnium(IV) based on phthalocyanines in solutions and in thin films were investigated. It was established that a significant bathochromic shift of the Q band and redistribution of the intensities in the absorption bands are observed in the electronic absorption spectra. It was shown that films of the synthesized compounds are promising for use as photosensitizers and electrochemical sensors for oxygen in solution. __________ Translated from Teoreticheskaya i éksperimental’naya Khimiya, Vol. 44, No. 3, pp. 133–137, May–June, 2008.     

Electrochemical Behavior of Novel Bis(β-diketonate)phthalocyanine Complexes of Zr(IV) and Hf(IV)

We have used cyclic voltammetry to study the electrochemical properties of novel bis(-diketonate)phthalocyanine complexes of Zr(IV) and Hf(IV) in dichloromethane. We found three waves for the studied complexes that can be attributed to one-electron processes MPc(L)^0/1– ₂, MPc(L)^1+/0 ₂ and MPc(L)^2+/1+ ₂. We have shown that the electrochemical behavior of the complexes depends on the nature of the substituents in axial ligands and does not depend on the nature of the metals. We have analyzed the stability of the one-electron oxidation products of the complexes relative to disproportionation.     

Physicochemical properties of novel mixed-ligand complexes of zirconium and hafnium bis(4-benzoyl-3-methyl-1-phenyl-2-pyrazolin-5-onato)phthalocyaninates

We have studied the spectral (IR, PMR, electronic absorption spectra) and luminescent properties of novel mixed-ligand complexes of zirconium(IV) and hafnium(IV) phthalocyaninates with 4-benzoyl-3-methyl-1-phenyl-2-pyrazolin-5-one in different organic solvents. We have determined the fluorescence quantum yields, the natural lifetimes of the excited states, and the molar extinction coefficients for the complexes. __________ Translated from Teoreticheskaya i éksperimental’naya Khimiya, Vol. 42, No. 3, pp. 162–167, May–June, 2006.     

Effect of styryl substituents introduced into the periphery of pyrazinoporphyrazine macrocycle on the spectral and luminescence properties of complexes

A synthesis is reported for a new pyrazinoporphyrazine complex containing eight styryl fragments on the periphery of the macrocycle, namely, zinc tetrakis-2,3-{5,6-bis[(E)-2-(4-methylphenyl)vinyl]pyrazino}-porphyrazine. The introduction of styryl substituents into the macrocycle leads to a significant bathochromic shift of the Q-band in the electronic absorption spectrum and to an increase in the fluorescence quantum yield. __________ Translated from Teoreticheskaya i éksperimental’naya Khimiya, Vol. 43, No. 2, pp. 118–123, March–April, 2007.