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Abstract <p>To complete the studies of double complex compounds, (<i>N</i>-thiocyanato)chromates(III) of lanthanide complexes with pyridine-3-carboxylic acid, new compounds of the compositions [LnL<sub>3</sub>(H<sub>2</sub>O)<sub>2</sub>][Cr(NCS)<sub>6</sub>]·<i>n</i>H<sub>2</sub>O were synthesized from aqueous solutions (Ln = Pr (<b>I</b>), <i>n</i> = 1.5; Sm (<b>II</b>), Gd (<b>III</b>), Tb (<b>IV</b>), <i>n</i> = 2; L = C<sub>6</sub>H<sub>5</sub>NO<sub>2</sub>). The substances were studied by chemical analysis, IR spectroscopy, and PXRD (CCDC nos. 2427051–2427054). In the crystal structures of complexes <b>I</b>–<b>IV</b>, the cation has a chain structure due to the bidentate-bridging function of pyridine-3-carboxylic (nicotinic) acid molecules. The coordination environment of the lanthanide atoms consists of eight oxygen atoms belonging to six nicotinic acid molecules and two coordinated H<sub>2</sub>O molecules, located at the vertices of a distorted square antiprism. In the isolated [Cr(NCS)<sub>6</sub>]<sup>3–</sup> anions, the Cr coordination polyhedron consists of the N atoms of six thiocyanate ions and is close to a regular octahedron. In the structures of complexes <b>I</b>–<b>IV</b>, the space between polymeric cations is filled with complex anions and crystallization water molecules. Additionally, the structure is stabilized by intermolecular hydrogen bonds.</p>

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Structural Characteristics of (N-Thiocyanato)chromates(III) of Lanthanides(III) with Pyridine-3-carboxylic Acid

  • 期刊论文

  • 发表日期：

    2025年7月1日

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  • E. V. Cherkasova,
  • N. V. Pervukhina,
  • N. V. Kuratieva,
  • T. G. Cherkasova

摘要

Abstract

To complete the studies of double complex compounds, (N-thiocyanato)chromates(III) of lanthanide complexes with pyridine-3-carboxylic acid, new compounds of the compositions [LnL3(H2O)2][Cr(NCS)6]·nH2O were synthesized from aqueous solutions (Ln = Pr (I), n = 1.5; Sm (II), Gd (III), Tb (IV), n = 2; L = C6H5NO2). The substances were studied by chemical analysis, IR spectroscopy, and PXRD (CCDC nos. 2427051–2427054). In the crystal structures of complexes I–IV, the cation has a chain structure due to the bidentate-bridging function of pyridine-3-carboxylic (nicotinic) acid molecules. The coordination environment of the lanthanide atoms consists of eight oxygen atoms belonging to six nicotinic acid molecules and two coordinated H2O molecules, located at the vertices of a distorted square antiprism. In the isolated [Cr(NCS)6]3– anions, the Cr coordination polyhedron consists of the N atoms of six thiocyanate ions and is close to a regular octahedron. In the structures of complexes I–IV, the space between polymeric cations is filled with complex anions and crystallization water molecules. Additionally, the structure is stabilized by intermolecular hydrogen bonds.