Polymorphism and phase transformations in cobaltacarborane molecular crystals
Polymorphism and phase transformations in cobaltacarborane molecular crystals
The full study of polymorphism in the cobaltacarborane closo-[3-Co(5-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).
carboranes, unconventional hydrogen-bonds, chemistry, clusters, metallacarborane, spectroscopy, solid-state
888-894
Planas, J.G.
6c0a7023-e8d8-4ae7-b5cb-7ca75d6300bf
Vinas, C.
7246d2ed-9998-4686-93ab-d731d9db34f2
Teixidor, F.
75ee1e6e-a91d-4174-9a12-76fd58a7575e
Light, M.E.
cf57314e-6856-491b-a8d2-2dffc452e161
Hursthouse, M.B.
57a2ddf9-b1b3-4f38-bfe9-ef2f526388da
2007
Planas, J.G.
6c0a7023-e8d8-4ae7-b5cb-7ca75d6300bf
Vinas, C.
7246d2ed-9998-4686-93ab-d731d9db34f2
Teixidor, F.
75ee1e6e-a91d-4174-9a12-76fd58a7575e
Light, M.E.
cf57314e-6856-491b-a8d2-2dffc452e161
Hursthouse, M.B.
57a2ddf9-b1b3-4f38-bfe9-ef2f526388da
Planas, J.G., Vinas, C., Teixidor, F., Light, M.E. and Hursthouse, M.B.
(2007)
Polymorphism and phase transformations in cobaltacarborane molecular crystals.
CrystEngComm, 9 (10), .
(doi:10.1039/b704833e).
Abstract
The full study of polymorphism in the cobaltacarborane closo-[3-Co(5-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).
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Published date: 2007
Keywords:
carboranes, unconventional hydrogen-bonds, chemistry, clusters, metallacarborane, spectroscopy, solid-state
Identifiers
Local EPrints ID: 54364
URI: http://eprints.soton.ac.uk/id/eprint/54364
ISSN: 1466-8033
PURE UUID: 584518df-9f0c-4367-9b5a-37ec75505279
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Date deposited: 31 Jul 2008
Last modified: 16 Mar 2024 03:04
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Author:
J.G. Planas
Author:
C. Vinas
Author:
F. Teixidor
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