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The structure, optical and conducting properties of thin vacuum deposited films of erbium bisphthalocyanine (Pc2Er) and its mixtures with metal-free phthalocyanine (H2Pc) have been studied with particular reference to the near infrared (NIR). It has been found that, in spite of intense optical absorbance over the UV/Vis/NIR domain, pure Pc2Er films are weakly photoconductive. However, in the mixed Pc2Er/H2Pc films the photocurrent signal was detected in the NIR range of 1200–1500 nm, which is associated with optical activity of Pc2Er molecules.
 P.N. Moskalev and I.S. Kirin: “Synthesis and some properties of yttrium and erbium diphthalocyanines”, Zhurnal Neorganitcheskoi Khimii, Vol. 15, (1970), pp. 13–15 (in Russian).
 J. Simon and P. Bassoul: Design of Molecular Materials: Supramolecular engineering, John Wiley & Sons, London and New York, 2001, pp. 196–295.
 A.N. Darovskikh and O.V. Frank-Kamenetskaya: “Crystallographic structure of phthalocyanine complexes with metals. Peculiarities of charge transfer bonds”, In: Problems of Crystallography, Nauka, Moscow, 1988, pp. 117–134 (in Russian); M.K. Engel: “Single-crystal and solid-state molecular structures of phthalocyanine complexes”, Rep. Kawamura Inst. Chem. Res. /Kawamura Rikagaku Kenkyusho Hokoku/, Vol. 1997, (1996), pp. 11–54.
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