Phthalocyanine deodorizers

The low stability of the magnesium porphyrins has precluded most potential applications. Other metallotetrapyrroles have found industrial uses for oil desulfurization, as photoconducting agents in photocopiers, deodorants, germicides, optical computer disks, semiconductor devices, photovoltaic cells, optical and electrochemical sensing, and molecular electronic materials. A few scattered examples of the use of Mg porphyrins in nonlinear optical studies have appeared" and magnesium phthalocyanines have been used in a few studies as semiconductor or photovoltaic materials" " One of the few... 

Within this field, many basic investigations and proposals for practical application have been made by Shirai et al. l They have investigated tetra- and octa-carboxylic acid derivatives of iron phthalocyanine and cobalt phthalocyanine, and found that catalytic activity is affected by the states of electron spins of metal ions and inactivated by formation of the mu-oxo dimer. Iron and cobalt ion in high spin states are more reactive than that in low spin states. High spin states of metal ions are achieved by modification of ligands. Shirai et al. have applied these materials as fiber deodorizers for such odors as ammonia, trimethylamine, hydrogen sulfide, and methanethiol, in which the phthalocyanine compounds are supported on fibers of cotton, wool, rayon, and artificial fibers. 

Orient Chemicals market iron phthalocyanine derivatives and cobalt phthalocyanine derivatives as deodorizers under the trade name of DEORASE. These materials were developed in collaboration with Shirai et al. Figure 17-8 shows the deodorizing effects of the products supported on textiles on ammonia and hydrogen sulfide. 

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