Issue 24, 2018

Crystal habit modification of Cu(ii) isonicotinate–N-oxide complexes using gel phase crystallisation

Abstract

We report the crystallisation of three forms of the copper(II) isonicotinate–N-oxide complex and their phase interconversion via solvent-mediated crystal-to-crystal transformation. The different forms of the copper complex have been isolated and characterised by single crystal X-ray diffraction. Gel phase crystallisation performed in hydrogels, low molecular weight gels and gels of a tailored gelator showed crystal habit modification. Crystallisation in aqueous ethanol resulted in the concomitant formation of blue (form-I) and green (form-II/IV) crystals while the use of a low molecular weight gel resulted in the selective crystallization of the blue form-I under identical conditions. Comparison of the gel phase and the solution state crystallisation in various solvent compositions reveals that the blue form-I is the thermodynamically stable form under ambient conditions.

Graphical abstract: Crystal habit modification of Cu(ii) isonicotinate–N-oxide complexes using gel phase crystallisation

Supplementary files

Article information

Article type
Paper
Submitted
04 Oct 2018
Accepted
01 Nov 2018
First published
02 Nov 2018

New J. Chem., 2018,42, 19963-19970

Crystal habit modification of Cu(II) isonicotinate–N-oxide complexes using gel phase crystallisation

D. Ghosh, K. Ferfolja, Ž. Drabavičius, J. W. Steed and K. K. Damodaran, New J. Chem., 2018, 42, 19963 DOI: 10.1039/C8NJ05036H

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