Monolayers and Langmuir-Blodgett films of a palladium(II)-tetraazaporphyrin

Spread monolayers and Langmuir-Blodgett films were prepared with 2,3-bis(N- (3-thiopropyl)phthalimido)-7,8 12,13,17,18-hexakis(octylthio)-5,10,15,20-te traazaporphyrinate palladium(II) (PdR6R2'TAP). Although monolayers at the w ater/air interface tend to aggregate, transfer as multilayer films onto qua rtz slides was possible when the proper experimental conditions were chosen . The properties of the Langmuir-Blodgett films were investigated by UV-Vis and FTIR spectroscopy. Their structures were markedly influenced by transf er temperature. When the monolayer was transferred at T = 309 K, the corres ponding LB film showed a different packing structure with respect to the fi lms transferred at lower temperatures. This resulted in a better homogeneit y, as revealed by optical microscopy. The monolayer thickness and the refra ctive index were respectively determined by means of ellipsometry and with the aid of dark m-lines spectroscopy for LB films transferred at T = 309 K. (C) 1999 Elsevier Science S.A. All rights reserved.