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Open AccessReview

Zinc(II) as a Versatile Template for Efficient Dipolar and Octupolar Second-Order Nonlinear Optical Molecular Materials §

1
Dipartimento di Scienze Chimiche, Università di Catania, Viale A. Doria 8, I-95125 Catania, Italy
2
Dipartimento di Chimica dell’Università degli Studi di Milano, UdR-INSTM, Via Golgi 19, I-20133 Milano, Italy
*
Authors to whom correspondence should be addressed.
§
This review is dedicated to Prof. Renato Ugo, on the occasion of his 80th birthday, for his essential contribution to the field of metal complexes with second-order nonlinear optical properties.
Inorganics 2018, 6(4), 133; https://doi.org/10.3390/inorganics6040133
Received: 20 November 2018 / Revised: 6 December 2018 / Accepted: 8 December 2018 / Published: 11 December 2018
(This article belongs to the Special Issue Metal Complexes as Nonlinear Optical Molecular Materials)
This short review outlines the main results obtained in the field of molecular materials based on zinc coordination compounds for second-order nonlinear optics. It presents an overview of the main classes of second-order nonlinear optical (NLO) active complexes bearing monodentate, bidentate, tridentate, or tetradentate π-delocalized ligands such as substituted stilbazoles, bipyridines, phenanthrolines, terpyridines, and Schiff bases. Macrocyclic ligands such as porphyrins and phthalocyanines are not covered. This paper shows how coordination to the Zn(II) center of π-delocalized nitrogen donor ligands produces a significant enhancement of their quadratic hyperpolarizability. Dipolar complexes are mainly presented, but octupolar zinc complexes are also presented. The coverage is mainly focused on NLO properties that are measured at the molecular level, working in solution, by means of the electric field-induced second harmonic generation (EFISH) or the hyper-Rayleigh scattering (HRS) techniques. View Full-Text
Keywords: Zinc(II) complexes; second-order nonlinear optics; EFISH; HRS Zinc(II) complexes; second-order nonlinear optics; EFISH; HRS
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MDPI and ACS Style

Di Bella, S.; Colombo, A.; Dragonetti, C.; Righetto, S.; Roberto, D. Zinc(II) as a Versatile Template for Efficient Dipolar and Octupolar Second-Order Nonlinear Optical Molecular Materials §. Inorganics 2018, 6, 133.

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