Highly Disordered Crystalline-Phase Transition of Tetrakis(1-adamantanecarboxymethyl)methane

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  • Li Rong
    College of Chemistry and Chemical Engineering, Central South University
  • Pan Chunyue
    College of Chemistry and Chemical Engineering, Central South University
  • Xiong Shaohui
    College of Chemistry and Chemical Engineering, Central South University
  • Yu Guipeng
    College of Chemistry and Chemical Engineering, Central South University
  • Wang Pingshan
    College of Chemistry and Chemical Engineering, Central South University
  • Zou Yingping
    College of Chemistry and Chemical Engineering, Central South University
  • Zhang Aiqing
    School of Chemistry and Materials Science, South-Central University for Nationalities

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Tetrakis(1-adamantanecarboxymethyl)methane was prepared by indirect esterification. DSC traces of tetrakis(1-adamantanecarboxymethyl)methane showed two endothermic peaks. Entropy ratio of these two peaks is: ΔStrs/ΔSfus = 1.58 > 1. XRD confirmed the solid–solid transition and analysis of XRD by DICVOL demonstrated tetrakis(1-adamantanecarboxymethyl)methane is a new compound with a highly disordered crystalline phase. Analysis of entropy changes at transitions showed why fusion entropy (ΔSfus = 70.07 J mol−1 K−1) of tetrakis(1-adamantanecarboxymethyl)methane is much larger than Timmermans’ criterion.

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