Croatica Chemica Acta, Vol. 87 No. 4, 2014.
Original scientific paper
https://doi.org/10.5562/cca2485
Mechanochemically Induced Anion Exchange in Aminoazobenzene Salts
Iva Džeba
; Rudjer Bošković Institute, Bijenička 54, 10000 Zagreb, Croatia
Ivan Halasz
; Rudjer Bošković Institute, Bijenička 54, 10000 Zagreb, Croatia
Kaja Lukić-Glavaš
; Department of Chemistry, Faculty of Science and Mathematics, University of Zagreb, Horvatovac 102A, 10000 Zagreb, Croatia
Hrvoj Vančik
orcid.org/0000-0002-4218-9214
; Department of Chemistry, Faculty of Science and Mathematics, University of Zagreb, Horvatovac 102A, 10000 Zagreb, Croatia
Abstract
Aminoazobenzene sulfate salt reacts with the crystals of KBr in solid-state under high pressure yield-ing corresponding bromide salt. The reactant and product differ also in the position of protonation, amino group, and azo group, respectively. Since protonation of azo-group destroys the coplanarity of two benzene rings and diminishes -conjugation, the product differs from the reactant also in color, from orange to violet. Hence, the reaction is the example of the piezochromic effect. This solid-state process is studied by kinetic measurements, and the structures of the compounds were analyzed by X-ray chrystallography.
Keywords
mechanochemistry; solid-state reaction; azobenzene; Avrami equation; piezochromism
Hrčak ID:
131542
URI
Publication date:
22.12.2014.
Visits: 2.383 *