Oxovanadium phthalocyanines

The feasibility of synthesizing oxovanadium phthalocyanine (VOPc) from vanadium oxide, dicyanobenzene, and ethylene ycol using the microwave synthesis was investigated by comparing reaction temperatures under the microwave irradiations with the same factors of conventional synthesis. The efficiency of microwave synthesis over the conventional synthesis was illustrated by the yield of crude VOPc. Polymorph of VOPc was obtained ttough the acid-treatment and recrystallization step. The VOPos synthesized in various conditions were characterized hy the means of an X-ray dif actometry (XRD), a scanning electron microscopy (SEM), and a transmission electron Microscopy (TEM). 

Transalkylation occurs when oxovanadium(iv) octaethylporphyrin is heated with alumina, illite, or montmorillonite, which is an important result in terms of the natural synthesis of porphyrins and their homologues. Spectroscopic studies have been made of the monomer-dimer equilibrium in aqueous media for the 1 1 oxovanadium(iv)-tetrasulphophthalacyanine complex. The dimeric species may contain a V—O—bridge, or the packing of two molecules with a staggered arrangement of the phthalocyanine rings may allow the overlap between their 7t-electron systems to provide the adhesion. ... 

---