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Reversible Phase Transition of 4‐Ethoxybenzenammonium Iodide
Author(s) -
Wang WenXiang,
Fu XueQun
Publication year - 2013
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.201200406
Subject(s) - differential scanning calorimetry , iodide , phase transition , benzene , crystallography , phase (matter) , chemistry , dielectric , analytical chemistry (journal) , glass transition , crystal (programming language) , iodine , materials science , organic chemistry , thermodynamics , physics , polymer , optoelectronics , computer science , programming language
A new phase transition compound 4‐ethoxybenzenammonium iodide ( 1 ) (C 8 H 12 ON + · I – ) was determined. Differential scanning calorimetry (DSC) results show sharp peaks appear at 157.93 K (–115.22 °C) on heating and 157.00 K (–116.15 °C) on cooling with Δ H = 120.34 J · mol –1 , Δ S = 0.762 J · mol –1 · K –1 . The dielectric measurements appear clear slope change, which matches well as observed in the DSC results. The crystal structure analyze shows that the space group changes from P 2 1 at 103(2) K to P 2 1 / c at 298(2) K during the phase transition process. The essential difference between the two temperature structures is the relative orientation of the oxyethyl group to the benzene ring, slight displacements of the anionic iodine and the packing of the molecular species.