Synthesis, characterization and optical properties of nanosized lanthanum (III) complexes thin film with aryl-azo-pyrogallol derivatives

Taymour A Hamdalla; Seleim M Seleim; Rabah Hanem A Mohamed; A A A Darwish; T A Hanafy; Mohamed E Mahmoud

doi:10.1016/j.saa.2020.118448

Synthesis, characterization and optical properties of nanosized lanthanum (III) complexes thin film with aryl-azo-pyrogallol derivatives

Spectrochim Acta A Mol Biomol Spectrosc. 2020 Sep 5:238:118448. doi: 10.1016/j.saa.2020.118448. Epub 2020 May 5.

Authors

Taymour A Hamdalla¹, Seleim M Seleim², Rabah Hanem A Mohamed², A A A Darwish³, T A Hanafy⁴, Mohamed E Mahmoud²

Affiliations

¹ Department of Physics and Nano Research Unit, Faculty of Science, University of Tabuk, 71491 Tabuk, Saudi Arabia; Physics Department, Faculty of Science, Alexandria University, Ibrahimia, 21321 Alexandria, Egypt. Electronic address: [email protected].
² Chemistry Department, Faculty of Science, Alexandria University, Ibrahimia, 21321 Alexandria, Egypt.
³ Department of Physics and Nano Research Unit, Faculty of Science, University of Tabuk, 71491 Tabuk, Saudi Arabia; Department of Physics, Faculty of Education at Al-Mahweet, Sana'a University, Al-Mahweet, Yemen.
⁴ Department of Physics and Nano Research Unit, Faculty of Science, University of Tabuk, 71491 Tabuk, Saudi Arabia; Physics Department, Faculty of Science, Fayoum University, Fayoum 63514, Egypt.

PMID: 32388233
DOI: 10.1016/j.saa.2020.118448

Abstract

The present study is focused on the assembly of two new thin films based on the direct layer deposition of lanthanum ion from solution with two aryl-azo-pyrogallol ligands onto the surface of a glass substrate. Assembled lanthanum (III) complexes were characterized by different techniques including thermal gravimetric analysis, metal analysis by acid digestion and complexometric titration, Fourier transforms infrared, transmission electron microscopy, and X-ray diffraction. Two complexes were highly similar in their patterns and crystallinities with the characterized particle size range 23.16-23.31 nm. Energy gaps of the two complexes NS Na₃La(III)-(L1)₂ and NS Na₃La(III)-(L2)₂ were found to be 2.09 and 2.33 eV, respectively. Linear and calculated nonlinear optical properties have been studied for the two complexes. The nonlinear refractive index has been calculated and NS Na₃La(III)-(L2)₂ showed a high nonlinear behavior (n₂ = 8 × 10^-⁷ esu) and it could be a promising low-cost material in the optical nonlinear application.

Keywords: Azo pyrogallol; Layer by layer; Optical properties.