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<p>The reductive decarboxylation is a reaction which is used for the reduction of silver(I)-ions to solid silver in manifold applications. Despite the reductive decarboxylation is well investigated, details for the special case of silver citrate regarding the reaction mechanism and the structure of the products remained unrevealed. Herein, we monitor the decomposition reaction of solid silver citrate via dynamic thermal analysis with thermogravimetry and coupled mass spectrometry (DTA/TGA-MS) and subsequently investigate the solid products via scanning electron microscopy (SEM) accompanied by elemental analysis. The course of the reaction showed different decomposition rates. The volatile product range comprises carbon dioxide from the reductive decarboxylation, acetone, and hexane-2,5-dione. This indicates the intermediate occurrence of the acetonyl radical during the decomposition process, undergoing hydrogen abstraction and dimerisation. Furthermore, solid remaining products are formed of which one combusts during the heating process. Also, macroporous silver metal remains with a pore size of 1–5&#xa0;µm.</p> Graphical abstract <p></p>

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Monitoring of the thermal decomposition of solid silver citrate

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年4月24日

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  • Christian Biermaier,
  • Hannes Krüger,
  • Thomas Bechtold,
  • Tung Pham

摘要

The reductive decarboxylation is a reaction which is used for the reduction of silver(I)-ions to solid silver in manifold applications. Despite the reductive decarboxylation is well investigated, details for the special case of silver citrate regarding the reaction mechanism and the structure of the products remained unrevealed. Herein, we monitor the decomposition reaction of solid silver citrate via dynamic thermal analysis with thermogravimetry and coupled mass spectrometry (DTA/TGA-MS) and subsequently investigate the solid products via scanning electron microscopy (SEM) accompanied by elemental analysis. The course of the reaction showed different decomposition rates. The volatile product range comprises carbon dioxide from the reductive decarboxylation, acetone, and hexane-2,5-dione. This indicates the intermediate occurrence of the acetonyl radical during the decomposition process, undergoing hydrogen abstraction and dimerisation. Furthermore, solid remaining products are formed of which one combusts during the heating process. Also, macroporous silver metal remains with a pore size of 1–5 µm.

Graphical abstract