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

Ghosh, Dipankar and Ferfolja, Katja and Drabavičius, Žygimantas and Steed, Jonathan W. and Damodaran, Krishna K. (2018) 'Crystal habit modification of Cu(ii) isonicotinate–N-oxide complexes using gel phase crystallisation.', New journal of chemistry., 42 (24). pp. 19963-19970.


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.

Item Type:Article
Full text:(AM) Accepted Manuscript
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Date accepted:01 November 2018
Date deposited:14 December 2018
Date of first online publication:02 November 2018
Date first made open access:01 November 2019

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