Neodymium phthalocyanine

Recently, a new Q-switch for neodymium lasers has become available 29> which is extremely stable and shows energy-dependent Q-switching similar to the phthalocyanines by a rapid intersystem crossing into the triplet state 30>. This "dye is a nickel-complex, bis-[p-dimethylamino]-dithiobenzylnickel, and has a strong absorption band around 1 / in several solvents. 

The lanthanide phthalocyanine complexes, obtained by conventional methods starting from metal salts at 170-290°C and phthalonitrile (Example 26), contain one or two macrocycles for each metal atom [5,6,8,63,82,84-98]. Thus, according to Refs. 6,63, and 85, the complexes having compositions LnPc2H, XLnPc (X- is halide anion), and Ln2Pc3 (a super-complex ) were prepared from phthalonitrile as a precursor the ratio of the reaction products depends on the synthesis conditions and the metal nature. The ionic structure Nd(Pc)+Nd(Pc)2 was suggested [85] and refuted [63] for the neodymium super-complex Nd2Pc3 the covalent character of the donor-acceptor bonds in this compound and other lanthanide triple-decker phthalocyanines was proved by the study of dissociation conditions of these compounds [63]. 

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