STRUCTURAL AND SPECTROSCOPIC CHARACTERIZATION OF CU(II) [TETRAKIS-(3,3-DIMETHYL-1-BUTOXYCARBONYL)] PHTHALOCYANINE THIN-FILMS DEPOSITED BY THE LANGMUIR-BLODGETT TECHNIQUE
L. Pasimeni et al., STRUCTURAL AND SPECTROSCOPIC CHARACTERIZATION OF CU(II) [TETRAKIS-(3,3-DIMETHYL-1-BUTOXYCARBONYL)] PHTHALOCYANINE THIN-FILMS DEPOSITED BY THE LANGMUIR-BLODGETT TECHNIQUE, Thin solid films, 265(1-2), 1995, pp. 58-65
Langmuir-Blodgett (LB) films of Cu(II) [tetrakis(3,3-dimethyl-1-butoxy
carbonyl)] phthalocyanine were prepared and characterized by X-ray dif
fraction, and polarized UV-Vis and electron paramagnetic resonance (EP
R) spectroscopies. It was found that the phthalocyanine molecules depo
sited on quartz and polyethylene terephthalate (pet) are arranged edge
-on on the substrate with the normal to the molecular plane that lies
close to the plane of the film. Polarized W-Vis spectra of films show
in-plane anisotropy in the orientation of molecules for LB films depos
ited on quartz and on pet. EPR spectra also, assigned to CU2+ interact
ing species, were detected for the LB films deposited on pet. The spec
tra show a marked in-plane anisotropy of the Zeeman interaction when t
he magnetic field lies in the support plane. The analysis of their ang
ular dependence confirms that the plane of the phthalocyanine molecule
is almost perpendicular to the film plane and gives evidence that the
in-plane orientation anisotropy arises from two different distributio
ns of orientations pinned around two average orientations having an an
gle of 68 degrees between them.