Alkynyl substituted phthalocyanine derivatives as targets for optical limiting

Abstract

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.

Molecular Engineering of Peripherally And Axially Modified Phthalocyanines for Optical Limiting and Nonlinear Optics

“…The k coefficient of the palladium compound is smaller, despite having a larger nonlinear-absorption coefficient than compounds 13 and 15, because of its relatively large linear-absorption coefficient a 0 » 2.6 cm 8 PcZn, [49] and 31, [(OSO 2 C 3 H 7 ) 6 I]PcZn, [49] were all measured at mass concentrations of 1 g L ±1 in toluene, and are a series that can be used for comparison. These compounds all exhibit nonlinear absorption on the order of 10 ±8 cm W ±1 , the largest exhibited by both compounds 12 Compounds 37 to 40 represent the peripherally bridged dimers [50] and all were measured at 0.5 g L ±1 in toluene. Compound 37, PcCo(tBu 3 CºCtBu 3 )PcCo, is a cobalt dimer bridged with a triple-bonded carbon, compound 38, PcCo-(tBu 3 CºCtBu 3 )PcZn, is two monomers of cobalt and zinc phthalocyanine bridged in the same manner (Fig.…”

Nonlinear Optical Properties of Porphyrins

“…[23] Highly conjugated ethynyl-and butadyinylbridged bis(phthalocyanines) containing divalent metals such as 16 were prepared and experimentally studied using the Z-scan technique with nanosecond pulses at 532 nm. [24] Usually these types of compounds exhibit high magnitude nonlinear absorption, but insertion of a metal ion in the central cavity of mononuclear phthalocyanines reduces the magnitude of the nonlinear absorption. Here, the (phthalocyaninato)cobalt(II) based dimer 16, showed a good nonlinear absorption coefficient.…”

Synthesis, spectroscopic and DFT Characterization of 4β-(4-tert-Butylphenoxy)phthalocyanine positional isomers for non-linear optical absorption

“…7) were constructed to obtain the experimental b exp values of the respective isomers. The b exp values are compared with those reported previously for the a derivatives 41,42 and display the following trend: Fraction A (9.31 × 10 -10 mMW -1 )> Fraction B (7.89 × 10 -10 mMW -1 )> Fraction C (7.32 × 10 -10 mMW -1 ) > Fraction D (1.77 × 10 -10 mMW -1 ). Substitution at the a positions causes complex charge distribution which significantly affects the molecular orbitals of the Pc ring.…”