We have examined a number of metallosubphthalocyanines, most of which
are experimentally unknown except the boron ones. They are compared to
their phthalocyanine analogues. The approaching of a relatively large
central metal to the subphthalocyanine cavity is probably hindered by the
small hole. The structure-sensitive frequency decreases with the increase
of the out-of-plane displacement. Subphthalocyanines are promising
photosensitizers in photodynamic therapy since they have more encouraging
singlet-triplet gaps than phthalocyanines do.
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