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Abstract <p>Crystals of lead monochloroacetate, Pb(ClCH<sub>2</sub>COO)<sub>2</sub>, were obtained in the reaction of lead carbonate and aqueous chloroacetic acid. The compound crystallizes in the monoclinic system (space group <i>P</i>2<sub>1</sub>/<i>c</i>) with the unit-cell parameters <i>a</i> = 10.8346(6) Å, <i>b</i> = 7.7239(4) Å, <i>c</i> = 10.1484(5) Å, β = 106.542(5)°. Like in other medium- and long-chain lead carboxylates, the crystal structure of lead monochloroacetate is layered. Lead atoms are located in distorted seven-vertex PbO<sub>7</sub>-polyhedra, which share edges and form layers. Features of the crystal structures of lead salts of carboxylic acids with unbranched hydrocarbon radicals are discussed. In particular, salts of lead(II) <i>n</i>-alkyl carboxylates with the general formula Pb(C<sub><i>n</i></sub>H<InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11445_2025_8166_Article_IEq1.gif" Format="GIF" Height="11" Rendition="HTML" Resolution="72" Type="Linedraw" Width="30" /> </InlineMediaObject> <EquationSource Format="TEX">\(_{{2n + 1}}\)</EquationSource> <!--Cryst2560019Aksenov-m1--> </InlineEquation>COO)<sub>2</sub>, despite belonging to different symmetry and space groups (monoclinic <i>P</i>2<sub>1</sub>/<i>m</i> for <i>n</i> = 2 and 3, triclinic <i>P</i><InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11445_2025_8166_Article_IEq2.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="10" /> </InlineMediaObject> <EquationSource Format="TEX">\(\bar {1}\)</EquationSource> <!--Cryst2560019Aksenov-m2--> </InlineEquation> for <i>n</i> = 4–9, and monoclinic <i>P</i>2<sub>1</sub>/<i>c</i> for Pb(ClCH<sub>2</sub>COO)<sub>2</sub>), are characterized by the same arrangement of molecules, so they can be considered structurally related.</p>

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Synthesis, Crystal Structure, and Spectroscopic Study of Lead Monochloroacetate, Pb(ClCH2COO)2

  • 期刊论文

  • 发表日期：

    2025年6月1日

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  • S. A. Ivanov,
  • A. M. Banaru,
  • V. E. Kireev,
  • D. O. Charkin,
  • A. A. Kompanchenko,
  • A. N. Gosteva,
  • S. M. Aksenov

摘要

Abstract

Crystals of lead monochloroacetate, Pb(ClCH2COO)2, were obtained in the reaction of lead carbonate and aqueous chloroacetic acid. The compound crystallizes in the monoclinic system (space group P21/c) with the unit-cell parameters a = 10.8346(6) Å, b = 7.7239(4) Å, c = 10.1484(5) Å, β = 106.542(5)°. Like in other medium- and long-chain lead carboxylates, the crystal structure of lead monochloroacetate is layered. Lead atoms are located in distorted seven-vertex PbO7-polyhedra, which share edges and form layers. Features of the crystal structures of lead salts of carboxylic acids with unbranched hydrocarbon radicals are discussed. In particular, salts of lead(II) n-alkyl carboxylates with the general formula Pb(CnH \(_{{2n + 1}}\) COO)2, despite belonging to different symmetry and space groups (monoclinic P21/m for n = 2 and 3, triclinic P \(\bar {1}\) for n = 4–9, and monoclinic P21/c for Pb(ClCH2COO)2), are characterized by the same arrangement of molecules, so they can be considered structurally related.