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Abstract <p>The reactions of zinc(II) bromide with Schiff bases, 4-(2-hydroxyphenyl)methyleneamino-1,2,4-triazole (HL<sup>1</sup>) and 4-(2-hydroxy-3-methoxyphenyl)methyleneamino-1,2,4-triazole (HL<sup>2</sup>), yielded the complexes [Zn(HL<sup>1</sup>)<sub>2</sub>Br<sub>2</sub>] (<b>I</b>) and [Zn(HL<sup>2</sup>)<sub>2</sub>Br<sub>2</sub>] (<b>II</b>). It was shown that <b>I</b> and <b>II</b> are also formed upon the addition of hydrobromic acid to a suspension of zinc(II) coordination compounds containing anionic [L<sup>1</sup>]<sup>–</sup> and [L<sup>2</sup>]<sup>–</sup> ligands in MeOH. The crystal structures of compounds <b>I</b> and <b>II</b> were determined by single-crystal X-ray diffraction (CIF files CCDC no. 2502710 (<b>I</b>), no. 2502711 (<b>II</b>)). It was found that upon complexation with Zn<sup>2+</sup> ions, conformational changes occur in the HL<sup>1</sup> and HL<sup>2</sup> molecules. This facilitates intramolecular proton transfer, causing compounds <b>I</b> and <b>II</b> to exhibit a photochromic effect, which is confirmed by diffuse reflectance spectroscopy data.</p>

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New Photochromic Zinc(II) Complexes with 1,2,4-Triazole-Containing Schiff Bases

  • 期刊论文

  • 发表日期：

    2025年12月1日

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  • A. A. Bovkunova,
  • A. A. Anisimov,
  • V. E. Gontcharenko,
  • E. S. Bazhina,
  • I. V. Taydakov,
  • I. L. Eremenko,
  • I. V. Ananyev

摘要

Abstract

The reactions of zinc(II) bromide with Schiff bases, 4-(2-hydroxyphenyl)methyleneamino-1,2,4-triazole (HL1) and 4-(2-hydroxy-3-methoxyphenyl)methyleneamino-1,2,4-triazole (HL2), yielded the complexes [Zn(HL1)2Br2] (I) and [Zn(HL2)2Br2] (II). It was shown that I and II are also formed upon the addition of hydrobromic acid to a suspension of zinc(II) coordination compounds containing anionic [L1]– and [L2]– ligands in MeOH. The crystal structures of compounds I and II were determined by single-crystal X-ray diffraction (CIF files CCDC no. 2502710 (I), no. 2502711 (II)). It was found that upon complexation with Zn2+ ions, conformational changes occur in the HL1 and HL2 molecules. This facilitates intramolecular proton transfer, causing compounds I and II to exhibit a photochromic effect, which is confirmed by diffuse reflectance spectroscopy data.