Carol A. Jennings

Vibrational spectra of lutetium and ytterbium bis-phthalocyanine in thin solid films and SER(R)S on silver island films

Abstract Thin solid films of lutetium and ytterbium diphthalocyanine (Pc 2 ) complexes have been studied using vibrational and electronic absorptions, spontaneous and resonant Raman (RR) and surface enhanced Raman scattering (SERS) on silver island films. Surface enhanced resonance Raman spectra (SERRS) are identical to the RRS spectra with an enhancement factor of about 500. Vibrational data were consistent with a C 4 v molecular symmetry.

FT-Raman Spectroscopy of Thin Films of Titanyl Phthalocyanine and Vanadyl Phthalocyanine

Thin solid films of titanyl phthalocyanine (TiOPc) and vanadyl phthalocyanine (VOPc) have been vacuum evaporated onto glass substrates held at various temperatures in the range from -30 to 240°C. FT-Raman spectra have been collected using an Nd:YAG laser emitting at 1064.1 nm, a Michelson interferometer and an InGaAs detector. The characteristic vibrational wavenumbers have been assigned in the observed Raman spectra of TiOPc and VOPc molecules. Titanyl phthalocyanine and vanadyl phthalocyanine exist in a number of polymorphic forms which have characteristic x-ray diffraction patterns. Polymorphs can also be distinguished on the basis of the FT-Raman spectra. Titanyl phthalocyanine was present in an amorphous form from −30°C to room temperature. As the temperature was increased, type II TiOPc was produced. Vanadyl phthalocyanine displayed a similar behaviour. At room temperature the VOPc was amorphous, but with increasing temperature it crystallized in the type II polymorph. At 240°C the VOPc film existed in a highly preferred (010) orientation.