| http://www.w3.org/ns/prov#value | - Perkin Trans. 1, (1988), 2453-2458, which emit above 780 nm include derivatives of the naphthalocyanine and anthranylocyanine classes (FIG. 1) and the naphthalocyanine class is characterized by the general formulae, as depicted in FIG. 6, where M is a metal such as Si, Ge, Al, Sn and Ti and the like, and where R is an axial ligand, alkyl or aryl with or without a silicon (preferred axial moieties
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