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Article

Solid-State Nonlinear Optical Properties of Mononuclear Copper(II) Complexes with Chiral Tridentate and Tetradentate Schiff Base Ligands

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Dipartimento di Scienze Chimiche e Geologiche, Università degli Studi di Modena e Reggio Emilia, via G. Campi 103, 41125 Modena, Italy
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Dipartimento di Chimica, Università degli Studi di Milano, via C. Golgi 19, 20133 Milano, Italy
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Istituto di Scienze e Tecnologie Molecolari, Consiglio Nazionale delle Ricerche, via C. Golgi 19, 20133 Milano, Italy
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Author to whom correspondence should be addressed.
Materials 2019, 12(21), 3595; https://doi.org/10.3390/ma12213595
Received: 8 October 2019 / Revised: 28 October 2019 / Accepted: 29 October 2019 / Published: 1 November 2019
(This article belongs to the Special Issue Trends in Nonlinear Optical Materials)
Salen-type metal complexes have been actively studied for their nonlinear optical (NLO) properties, and push-pull compounds with charge asymmetry generated by electron releasing and withdrawing groups have shown promising results. As a continuation of our research in this field and aiming at solid-state features, herein we report on the synthesis of mononuclear copper(II) derivatives bearing either tridentate N2O Schiff bases L(a−c)− and pyridine as the forth ancillary ligand, [Cu(La−c)(py)](ClO4) (1ac), or unsymmetrically-substituted push-pull tetradentate N2O2 Schiff base ligands, [Cu(5-A-5′-D-saldpen/chxn)] (2ac), both derived from 5-substituted salicylaldehydes (sal) and the diamines (1R,2R)-1,2-diphenylethanediamine (dpen) and (1S,2S)-1,2-diaminocyclohexane (chxn). All compounds were characterized through elemental analysis, infrared and UV/visible spectroscopies, and mass spectrometry in order to guarantee their purity and assess their charge transfer properties. The structures of 1ac were determined via single-crystal X-ray diffraction studies. The geometries of cations of 1ac and of molecules 2ac were optimized through DFT calculations. The solid-state NLO behavior was measured by the Kurtz–Perry powder technique @1.907 µm. All chiral derivatives possess non-zero quadratic electric susceptibility (χ(2)) and an efficiency of about 0.15–0.45 times that of standard urea. View Full-Text
Keywords: chiral diamines; template synthesis; mononuclear copper(II) complexes; Schiff base ligands; nonlinear optics; Kurtz–Perry powder technique chiral diamines; template synthesis; mononuclear copper(II) complexes; Schiff base ligands; nonlinear optics; Kurtz–Perry powder technique
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MDPI and ACS Style

Rigamonti, L.; Forni, A.; Cariati, E.; Malavasi, G.; Pasini, A. Solid-State Nonlinear Optical Properties of Mononuclear Copper(II) Complexes with Chiral Tridentate and Tetradentate Schiff Base Ligands. Materials 2019, 12, 3595. https://doi.org/10.3390/ma12213595

AMA Style

Rigamonti L, Forni A, Cariati E, Malavasi G, Pasini A. Solid-State Nonlinear Optical Properties of Mononuclear Copper(II) Complexes with Chiral Tridentate and Tetradentate Schiff Base Ligands. Materials. 2019; 12(21):3595. https://doi.org/10.3390/ma12213595

Chicago/Turabian Style

Rigamonti, Luca, Alessandra Forni, Elena Cariati, Gianluca Malavasi, and Alessandro Pasini. 2019. "Solid-State Nonlinear Optical Properties of Mononuclear Copper(II) Complexes with Chiral Tridentate and Tetradentate Schiff Base Ligands" Materials 12, no. 21: 3595. https://doi.org/10.3390/ma12213595

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