Second-Harmonic Generation from Axially Substituted Indium Phthalocyanines

• Published in: The journal of physical chemistry. B 2000-08, Vol.104 (30), p.7066-7070
• Main Authors: Rojo, G, Martin, G, Agulló-López, F, Torres, T, Heckmann, H, Hanack, M
• Format: Article
• Language: English
• ISSN: 1520-6106; 1520-5207
• DOI: 10.1021/jp000927l

The quadratic hyperpolarizabilities of three axially substituted Indium phthalocyanines (In−Pcs) (1−3) in chloroform solution have been measured by the EFISH technique at λ = 1064 nm. A maximum value of 37.4 × 10-30 esu has been obtained for the trifluoromethylphenyl-substituted compound 3. The data have been analyzed with a two-level model corresponding to the Q-band and so the nonresonant values for the quadratic hyperpolarizability, β z (0), have been determined by taking into account the electronic contribution to γEFISH. The three components , , and of the susceptibility tensor have also been obtained for spin-coated films containing the three compounds dissolved in PMMA. Susceptibilities reach the highest values, = 3.3 × 10-10 esu, = 3.9 × 10-10 esu, and = 13.1 × 10-10 esu, for compound 3. Kleinman symmetry is approximately obeyed particularly for the Cl-substituted compound 1.