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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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Publication details

The article was received on 30 Mar 2007, accepted on 14 Jun 2007 and first published on 11 Jul 2007


Article type: Paper
DOI: 10.1039/B704833E
Citation: CrystEngComm, 2007,9, 888-894
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    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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