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<p>Sodium 10,12-pentacosadiynoate (PCDA-Na) was synthesized from 10,12-pentacosadiynoic acid (PCDA) using Na₂CO₃ (1:2) and NaOH (1:1) routes. Comprehensive characterization by FT-IR, PXRD, DSC, TGA, and elemental analysis confirmed salt formation. FT-IR revealed Δν = 146&#xa0;cm⁻¹ for ionic COO⁻, PXRD showed 44% crystallite size increase, and TGA identified decarboxylation (33.6%) followed by diacetylene decomposition (36.2%). These findings establish PCDA-Na as a thermally robust (stable to 195&#xa0;°C) PDA precursor with enhanced crystallinity, addressing the gap in alkali metal diacetyleneate thermal-structure relationships for sensor applications.</p>

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Spectroscopic and thermal characterization of chemically modified 10,12-pentacosadiynoic acid (PCDA) and its sodium salt (PCDA-Na)

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年4月16日

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  • Adebayo T. Bale,
  • William T. Pennington,
  • Colin D. McMillen

摘要

Sodium 10,12-pentacosadiynoate (PCDA-Na) was synthesized from 10,12-pentacosadiynoic acid (PCDA) using Na₂CO₃ (1:2) and NaOH (1:1) routes. Comprehensive characterization by FT-IR, PXRD, DSC, TGA, and elemental analysis confirmed salt formation. FT-IR revealed Δν = 146 cm⁻¹ for ionic COO⁻, PXRD showed 44% crystallite size increase, and TGA identified decarboxylation (33.6%) followed by diacetylene decomposition (36.2%). These findings establish PCDA-Na as a thermally robust (stable to 195 °C) PDA precursor with enhanced crystallinity, addressing the gap in alkali metal diacetyleneate thermal-structure relationships for sensor applications.