Quotation from Ullmann's Encyclopedia of Industrial Chemistry, Sixth Edition, 2002 Electronic Release
Phthalocyanine forms complexes with numerous metals of the periodic table. Today, 66 complexes with various elements are known. Metal phthalocyanines
and compounds with metalloids such as B, Si, Ge, and As or nonmetals such as P display a wide variety in their coordination chemistry.
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Phthalocyanines absorb strongly in the visible range of 600 to 700 nm. They are thus blue to bluegreen colorants.
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Phthalocyanine and its unsubstituted metal derivatives dissolve in highly acidic media such as concentrated sulfuric acid, chlorosulfuric acid, or
anhydrous hydrofluoric acid, presumably due to
protonation of the bridging nitrogen atoms. In the presence of strong bases, reversible deprotonation of the central imino groups occurs.
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