Tuning the dipolar second-order nonlinear optical properties of 5-π-delocalized-donor-1,3-di(2-pyridyl)benzenes, related cyclometallated platinum(ii) complexes and methylated salts

Filippo Nisic; Elena Cariati; Alessia Colombo; Claudia Dragonetti; Simona Fantacci; Eleonora Garoni; Elena Lucenti; Stefania Righetto; Dominique Roberto; J A Gareth Williams

doi:10.1039/c6dt04359c

Tuning the dipolar second-order nonlinear optical properties of 5-π-delocalized-donor-1,3-di(2-pyridyl)benzenes, related cyclometallated platinum(ii) complexes and methylated salts

Dalton Trans. 2017 Jan 24;46(4):1179-1185. doi: 10.1039/c6dt04359c.

Affiliations

¹ Dipartimento di Chimica dell'Università degli Studi di Milano, UdR-INSTM, via Golgi 19, I-20133, Milano, Italy. simona@thch.unipg.it.
² Dipartimento di Chimica dell'Università degli Studi di Milano, UdR-INSTM, via Golgi 19, I-20133, Milano, Italy. simona@thch.unipg.it and ISTM-CNR, via Golgi 19, I-20133, Milano, Italy.
³ Computational Laboratory for Hybrid/Organic Photovoltaics (CLHYO), CNR-ISTM, Via Elce di Sotto 8, I-06213, Perugia, Italy.
⁴ ISTM-CNR, via Golgi 19, I-20133, Milano, Italy.
⁵ Department of Chemistry, University of Durham, South Road, Durham, DH1 3LE, UK.

PMID: 28054096
DOI: 10.1039/c6dt04359c

Abstract

The synthesis and characterization of three 5-π-delocalized-donor-1,3-di(2-pyridyl)benzenes is reported along with that of their related cyclometallated platinum(ii) complexes and N,N-dimethylated iodide salts. The second-order nonlinear optical (NLO) properties of all the compounds have been determined by the Electric Field Induced Second Harmonic generation technique, showing how the μβ_EFISH absolute value of 1,3-di(2-pyridyl)benzenes can be tuned by the nature of the substituent on position 5 of the central benzene ring, and greatly increased by cyclometallation to Pt or by N-methylation.