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Abstract <p>The reactions of oxovanadium(IV) sulfate with potassium salts of 2,3-, 2,4-, 2,5-, 3,4-, and 3,5-pyridinedicarboxylic acids (PdcH<sub>2</sub>) and 2,2':6',2″-terpyridine (Terpy) resulted in the formation of mononuclear heteroleptic complexes [VO(2,3-Pdc)(Terpy)]·7H<sub>2</sub>O (<b>I</b>), [VO(2,4-Pdc)(Terpy)]·5H<sub>2</sub>O (<b>II</b>), [VO(2,5-Pdc)(Terpy)]·3H<sub>2</sub>O (<b>III</b>), [VO(3,4-Pdc)(Terpy)(H<sub>2</sub>O)]·4H<sub>2</sub>O (<b>IV</b>), [VO(3,5-Pdc)(Terpy)(H<sub>2</sub>O)]·7H<sub>2</sub>O (<b>V</b>), and [VO(3,5-PdcH)(Terpy)(H<sub>2</sub>O)](3,5-PdcH)·2H<sub>2</sub>O (<b>VI</b>), respectively. The structures of compounds <b>I</b>–<b>VI</b> were determined by single-crystal X-ray diffraction (CCDC nos. 2 326 828 (<b>I</b>), 2 326 829 (<b>II</b>), 2 326 830 (<b>III</b>), 2 326 831 (<b>IV</b>), 2 326 832 (<b>V</b>), 2 440 463 (<b>VI</b>)). In the structures of <b>I</b>–<b>III</b>, the acid dianions act as chelating ligands via the pyridine N atom and the O atom of one carboxyl group, while in compounds <b>IV</b>–<b>VI</b>, the acid anion is coordinated in the monodentate fashion. In the crystal packing of compounds <b>I</b>–<b>III</b>, intermolecular π–π-interactions between the heteroaromatic moieties of N-donor ligands are present, while in complexes <b>IV</b> and <b>V</b>, the intermolecular π–π-interactions involve also the pyridyl rings of dicarboxylate anions. Polycrystalline samples and solutions of complexes <b>III</b> and <b>IV</b> were characterized by EPR spectroscopy.</p>

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Oxovanadium(IV) Complexes with Pyridinedicarboxylate Anions and Terpyridine: Synthesis, Structure, and EPR Spectra

  • 期刊论文

  • 发表日期：

    2025年8月1日

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  • E. S. Bazhina,
  • M. A. Shmelev,
  • N. V. Gogoleva,
  • E. A. Ugolkova,
  • N. N. Efimov,
  • M. A. Kiskin,
  • I. L. Eremenko

摘要

Abstract

The reactions of oxovanadium(IV) sulfate with potassium salts of 2,3-, 2,4-, 2,5-, 3,4-, and 3,5-pyridinedicarboxylic acids (PdcH2) and 2,2':6',2″-terpyridine (Terpy) resulted in the formation of mononuclear heteroleptic complexes [VO(2,3-Pdc)(Terpy)]·7H2O (I), [VO(2,4-Pdc)(Terpy)]·5H2O (II), [VO(2,5-Pdc)(Terpy)]·3H2O (III), [VO(3,4-Pdc)(Terpy)(H2O)]·4H2O (IV), [VO(3,5-Pdc)(Terpy)(H2O)]·7H2O (V), and [VO(3,5-PdcH)(Terpy)(H2O)](3,5-PdcH)·2H2O (VI), respectively. The structures of compounds I–VI were determined by single-crystal X-ray diffraction (CCDC nos. 2 326 828 (I), 2 326 829 (II), 2 326 830 (III), 2 326 831 (IV), 2 326 832 (V), 2 440 463 (VI)). In the structures of I–III, the acid dianions act as chelating ligands via the pyridine N atom and the O atom of one carboxyl group, while in compounds IV–VI, the acid anion is coordinated in the monodentate fashion. In the crystal packing of compounds I–III, intermolecular π–π-interactions between the heteroaromatic moieties of N-donor ligands are present, while in complexes IV and V, the intermolecular π–π-interactions involve also the pyridyl rings of dicarboxylate anions. Polycrystalline samples and solutions of complexes III and IV were characterized by EPR spectroscopy.