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Abstract <p>Single crystals of two new complex hydroselenites with organic cations—(C<sub>4</sub>H<sub>12</sub>N<sub>2</sub>)[Mn(HSeO<sub>3</sub>)<sub>2</sub>Cl<sub>2</sub>] (<b>1</b>) and [(C<sub>4</sub>N<sub>12</sub>N<sub>2</sub>)Br]<sub>2</sub>[Mn(HSeO<sub>3</sub>)<sub>2</sub>Br<sub>2</sub>] (<b>2</b>)—were obtained as the products of the reaction of piperazine, selenious acid, and manganese halide in an aqueous medium. The crystal structures of <b>1</b> and <b>2</b> were determined by single-crystal X-ray diffraction analysis; they are characterized by monoclinic symmetry (<b>1</b>: <i>P</i>2<sub>1</sub>/<i>c</i>, <i>a</i> = 9.7557(7) Å, <i>b</i> = 7.3930(5) Å, <i>c</i> = 9.7660(6) Å, β = 116.839(7)°; <b>2</b>: <i>P</i>2<sub>1</sub>/<i>c</i>, <i>a</i> = 14.4093(3) Å, <i>b</i> = 7.3822(1) Å, <i>c</i> = 10.3051(3) Å, β = 101.553(2)°). The crystal structures of both compounds are constructed by alternating layers of the composition [Mn(HSeO<sub>3</sub>)<sub>2</sub><i>X</i><sub>2</sub>]<sup>2–</sup> (<i>X</i> = Cl, Br) and layers formed by piperazinium cations. Compound <b>1</b> is a structural analogue of the previously described compound (C<sub>4</sub>H<sub>12</sub>N<sub>2</sub>)[Cd(HSeO<sub>3</sub>)<sub>2</sub>Cl<sub>2</sub>], while the crystal structure of compound <b>2</b> belongs to a new structural type, is characterized by a modular structure, and contains layers including both piperazinium cations and bromine anions.</p>

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Synthesis and Crystal Structures of (C4H12N2)[Mn(HSeO3)2Cl2] and [(C4N12N2)2Br]2[Mn(HSeO3)2Br2]—New Representatives of the Modular Family of “Layered Hydroselenites”

  • 期刊论文

  • 发表日期：

    2025年6月1日

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  • V. E. Kireev,
  • D. N. Dmitriev,
  • D. O. Charkin,
  • S. M. Aksenov

摘要

Abstract

Single crystals of two new complex hydroselenites with organic cations—(C4H12N2)[Mn(HSeO3)2Cl2] (1) and [(C4N12N2)Br]2[Mn(HSeO3)2Br2] (2)—were obtained as the products of the reaction of piperazine, selenious acid, and manganese halide in an aqueous medium. The crystal structures of 1 and 2 were determined by single-crystal X-ray diffraction analysis; they are characterized by monoclinic symmetry (1: P21/c, a = 9.7557(7) Å, b = 7.3930(5) Å, c = 9.7660(6) Å, β = 116.839(7)°; 2: P21/c, a = 14.4093(3) Å, b = 7.3822(1) Å, c = 10.3051(3) Å, β = 101.553(2)°). The crystal structures of both compounds are constructed by alternating layers of the composition [Mn(HSeO3)2X2]2– (X = Cl, Br) and layers formed by piperazinium cations. Compound 1 is a structural analogue of the previously described compound (C4H12N2)[Cd(HSeO3)2Cl2], while the crystal structure of compound 2 belongs to a new structural type, is characterized by a modular structure, and contains layers including both piperazinium cations and bromine anions.