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Issue 8, 2012
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A series of compounds forming polar crystals and showing single-crystal-to-single-crystal transitions between polar phases

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Abstract

Condensation of 4-hydroxybenzohydrazide with a variety of non-chiral aliphatic ketones, methylethylketone, acetone, cyclohexanone and cyclobutanone, affords imine compounds crystallizing in polar space groups (Pna21 or Cc). For all the compounds synthesized, the crystal structure was determined by single crystal X-ray analysis and second harmonic generation experiments were performed on powder samples. The imine obtained using acetone shows solid state polymorphism with unusual behaviour; three different crystal phases have been identified (phases I, II and III), all having the same polar space group Pna21, and the transitions from I to II and from III to II are topotactic, i.e. single-crystal-to-single-crystal. During the irreversible transition from phase I to II, the polar axis undergoes a strong compression (about 15%) and single crystals of the parent phase are violently shattered into single crystal fragments of the new phase, while in the reversible transition from phase III to II, the polar axis expands (about 14%) and the integrity of single crystals is preserved.

Graphical abstract: A series of compounds forming polar crystals and showing single-crystal-to-single-crystal transitions between polar phases

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Article information


Submitted
11 Oct 2011
Accepted
06 Dec 2011
First published
04 Jan 2012

CrystEngComm, 2012,14, 2645-2653
Article type
Paper

A series of compounds forming polar crystals and showing single-crystal-to-single-crystal transitions between polar phases

R. Centore, M. Jazbinsek, A. Tuzi, A. Roviello, A. Capobianco and A. Peluso, CrystEngComm, 2012, 14, 2645
DOI: 10.1039/C2CE06352B

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