Electron density, disorder and polymorphism: high-resolution diffraction studies of the highly polymorphic neuralgic drug carbamazepine.

Electron density, disorder and polymorphism: high-resolution diffraction studies of the highly polymorphic neuralgic drug carbamazepine.
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电子密度、无序和多态性:高度多态性神经痛药物卡马西平的高分辨率衍射研究。

DOI:
10.1107/s2052520615019538
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发表时间:
2016
期刊:
Acta crystallographica Section B, Structural science, crystal engineering and materials
影响因子:
--
通讯作者:
Sovago I
Sovago I
中科院分区:
--
文献类型:
--
作者:
Sovago I

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Analysis of neutron and high-resolution X-ray diffraction data on form (III) of carbamazepine at 100 K using the atoms in molecules (AIM) topological approach afforded excellent agreement between the experimental results and theoretical densities from the optimized gas-phase structure and from multipole modelling of static theoretical structure factors. The charge density analysis provides experimental confirmation of the partially localized π-bonding suggested by the conventional structural formula, but the evidence for any significant C—N π bonding is not strong. Hirshfeld atom refinement (HAR) gives H atom positional and anisotropic displacement parameters that agree very well with the neutron parameters. X-ray and neutron diffraction data on the dihydrate of carbemazepine strongly indicate a disordered orthorhombic crystal structure in the space group Cmca, rather than a monoclinic crystal structure in space group P21/c. This disorder in the dihydrate structure has implications for both experimental and theoretical studies of polymorphism.
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