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Synthesis, Structural Characterization, and Nonlinear Optical Properties of a Zwitterionic Glycine-Coordinated Copper(II) Complex for Efficient Optical Limiting.

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Title: Synthesis, Structural Characterization, and Nonlinear Optical Properties of a Zwitterionic Glycine-Coordinated Copper(II) Complex for Efficient Optical Limiting.
Authors: Lakshmi Narayana Reddy, N.1 (AUTHOR), Jeyakumari, A. Pricilla1 (AUTHOR) pricilla1510@gmail.com, Hegde, Tejaswi Ashok2 (AUTHOR) tejaswiashokhegde@gmail.com, Jeevitha, T. U.3 (AUTHOR)
Source: Journal of Inorganic & Organometallic Polymers & Materials. May2026, Vol. 36 Issue 7, p4056-4071. 16p.
Subjects: Optical limiting, Nonlinear optical techniques, Copper compounds, Photoluminescence, Thermal stability, Crystal structure, Amino acids
Abstract: The study presents the successful synthesis and crystallization of a square pyramidal copper(II) complex coordinated with glycine in its zwitterionic form (1), as confirmed by single crystal XRD study. The complex crystallizes in an orthorhombic system with space group , exhibiting a tetracoordinated copper center bound to oxygen and sulfur atoms in a cis-square planar geometry. The crystal structure is stabilized by a comprehensive grid of hydrogen bonds involving N–H O and N–H S interactions, which form characteristic graph-set motifs and contribute to a three-dimensional molecular packing. FTIR confirmed glycine coordination and Cu–N/Cu–S bonding. Thermogravimetric analysis reveals that the title compound is thermally stable up to , adequate for room-temperature lasing applications, and its subsequent decomposition further supports the elemental composition of the material. UV–Visible spectra showed a strong peak at 208 nm, an absorption edge at 237 nm, and a wide band gap of 5.55 eV, indicating high electronic stability. Photoluminescence revealed broad emission from 370 to 532 nm, deconvoluted into ligand-centered, ligand-to-metal, and metal-centered transitions, demonstrating efficient energy redistribution within the complex. Glycine, in its zwitterionic form, acts as a bidentate ligand coordinating with transition metals to form complexes exhibiting nonlinear optical behavior, including nonlinear absorption, refraction, and excited-state transitions through metal-ligand charge transfer. The nonlinear optical studies by Z-scan revealed self-defocusing behavior and efficient optical limiting. The measured nonlinear refractive index was , and the nonlinear absorption coefficient was. The third-order nonlinear optical susceptibility was found to be esu, demonstrating significant third-order nonlinear response. Optical limiting measurements showed an onset threshold of proving the material's ability to shield optical devices from high-intensity light. [ABSTRACT FROM AUTHOR]
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Abstract:The study presents the successful synthesis and crystallization of a square pyramidal copper(II) complex coordinated with glycine in its zwitterionic form (1), as confirmed by single crystal XRD study. The complex crystallizes in an orthorhombic system with space group , exhibiting a tetracoordinated copper center bound to oxygen and sulfur atoms in a cis-square planar geometry. The crystal structure is stabilized by a comprehensive grid of hydrogen bonds involving N–H O and N–H S interactions, which form characteristic graph-set motifs and contribute to a three-dimensional molecular packing. FTIR confirmed glycine coordination and Cu–N/Cu–S bonding. Thermogravimetric analysis reveals that the title compound is thermally stable up to , adequate for room-temperature lasing applications, and its subsequent decomposition further supports the elemental composition of the material. UV–Visible spectra showed a strong peak at 208 nm, an absorption edge at 237 nm, and a wide band gap of 5.55 eV, indicating high electronic stability. Photoluminescence revealed broad emission from 370 to 532 nm, deconvoluted into ligand-centered, ligand-to-metal, and metal-centered transitions, demonstrating efficient energy redistribution within the complex. Glycine, in its zwitterionic form, acts as a bidentate ligand coordinating with transition metals to form complexes exhibiting nonlinear optical behavior, including nonlinear absorption, refraction, and excited-state transitions through metal-ligand charge transfer. The nonlinear optical studies by Z-scan revealed self-defocusing behavior and efficient optical limiting. The measured nonlinear refractive index was , and the nonlinear absorption coefficient was. The third-order nonlinear optical susceptibility was found to be esu, demonstrating significant third-order nonlinear response. Optical limiting measurements showed an onset threshold of proving the material's ability to shield optical devices from high-intensity light. [ABSTRACT FROM AUTHOR]
ISSN:15741443
DOI:10.1007/s10904-025-04123-6