Alkynyl substituted phthalocyanine derivatives as targets for optical limiting

One of the key issues in the development of efficient optical limiters is the search for appropriate materials with improved nonlinear absorption. Phthalocyanine materials are among the most promising nonlinear absorbers described in the literature. Ethynyl and butadiynyl-bridged bisphthalocyanines and related ethynyl-containing mononuclear compounds have been synthesized and experimentally studied using the z-scan technique with nanosecond pulses at 532 nm. We intend to ascertain the effect of the electronic interaction between macrocycles in the optical limiting performance of phthalocyanines.