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Issue 10, 2007
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Polymorphism and phase transformations in cobaltacarborane molecular crystals

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Abstract

The full study of polymorphism in the cobaltacarborane closo-[3-Co(η5-C5H5)-1,2-C2B9H11] (1) compound by a combination of X-ray diffraction, thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), IR and hot-stage microscopy (HSM) is reported for the first time. The previously reported Form I (orthorhombic Form, noncentrosymmetric space group P21212) crystallizes as dark yellow to orange flat prisms from polar dichloromethane. A new centrosymmetric modification (Form II) that crystallizes from a mixture of polar and non-polar solvents has been found. Form II crystallizes as pleochroic orange blocks in the monoclinic crystal system and space group P21/c. Phase transformation between both polymorphs has been observed by DSC, IR and HSM, showing that the centrosymmetric Form II (kinetic) converts irreversibly to the noncentrosymmetric Form I (thermodynamic).

Graphical abstract: Polymorphism and phase transformations in cobaltacarborane molecular crystals

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Article information


Submitted
30 Mar 2007
Accepted
14 Jun 2007
First published
11 Jul 2007

CrystEngComm, 2007,9, 888-894
Article type
Paper

Polymorphism and phase transformations in cobaltacarborane molecular crystals

J. G. Planas, C. Viñas, F. Teixidor, M. E. Light and M. B. Hursthouse, CrystEngComm, 2007, 9, 888
DOI: 10.1039/B704833E

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