マグネシウムナフタロシアニン蒸着膜の熱転移によるスペクトルの変化

概要

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Magnesium naphthalocyanine (MgNc) was prepared through two different routes, i.e., from 2, 3-dicyanonaphthalene and Mg in alpha-chloronaphthalene (MgNc-a) and from diiminobenzo-isoindoline and magnesium acetate in tetralin (MgNc-b) and vacuum evaporated onto glass plates. The evaporated films were then examined spectroscopically. The results were: (1) Q band spectra differed with the source of MgNc; specifically the spectra of MgNc-a varied slightly for each deposited film. (2) Absorption maxima of MgNc-a films were at 780nm and 720nm, the former for amorphous MgNc and the latter for crystalline. (3) MgNc-a tends to be amorphous because of the axial ligation of alpha-chloronaphthalene. (4) Alpha-chloronaphthalene splits off MgNc when the film is heated to the transition point and helps promote the rearrangement of MgNc molecules. MgNc-b does not make thermal transition because there are no solvent molecules effective for the relaxation. (5) For effective thermal transition, the vapor deposition of axially ligated Nc is recommended.
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