SYNTHESIS AND 3RD-ORDER NLO PROPERTIES IN LB FILMS OF TRIAZOLEHEMIPORPHYRAZINES

Langmuir-Blodgett (LB) films of free and cobalt(II)-metallated triazol ehemiporphyrazines (2-4), including some new synthesized compounds (3- 4), have been prepared and characterized. All investigated molecules a dopt an edge-on arrangement in the film as previously found for the st ructurally related phthalocyanines (Pcs). The real and imaginary parts of the third-harmonic susceptibility X-(3) (3 omega',omega,omega,omeg a) have been measured at 1.06 mu m fundamental wavelength. Values are similar to those obtained for LB films of Pcs. No significant effects associated with cobalt metallation have been found at variance with pr evious results in solution at lambda=1.3 and lambda=1.9 mu m. (C) 1998 Elsevier Science S.A. All rights reserved.