Structural Phase Transition
in Langmuir Films of Vanadyl Phthalocyanine

N. L. Levshin^a, S. G. Yudin^b, E. A. Krylova^a, and A. T. Zlatkin^b

^a Faculty of Chemistry, Moscow State University, Moscow, 119992 Russia

^b Institute of Crystallography, Russian Academy of Sciences, Leninskii pr. 59, Moscow, 119333 Russia

e-mail: lbf@ns.crys.ras.ru

Received June 27, 2007

Abstract—The Langmuir–Blodgett films based on vanadyl phthalocyanine (NHSO₂C₁₈H₃₇)₄ were studied. By
the method of piezoresonance quartz balance, the isotherms of adsorption of water, pyridine, and hexane on
film surfaces were obtained. A structural phase transition in the Langmuir films of vanadyl phthalocyanine at
about 313 K was revealed. The phase transition was observed in ultrathin films and disappeared as the number
of layers increased.

DOI: 10.1134/S0036024408110216

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