Thermal analysis, powder diffraction and spectroscopic investigation of the solid phases of 1-chloro-2,2-dimethylpropane by C. Buhrmester, G. Miehe, H. Ehrenberg, and H. Fuess

Crystal Research and Technology

Cryst. Res. Technol. 41, 48 (2006) - Abstract -

Thermal analysis, powder diffraction and spectroscopic investigation of the solid phases of 1-chloro-2,2-dimethylpropane

C. Buhrmester, G. Miehe, H. Ehrenberg, and H. Fuess

Darmstadt University of Technology, Institute for Materials science, Petersenstr. 23, 64287 Darmstadt, Germany

Keywords	ODIC phase, solid-solid phase transformation, powder diffraction, 35Cl NQR, 1H NMR second moment
PACS	64.70.Kb
DOI	10.1002/crat.200410528

By the substitution of one methyl group in Neopentane C(CH₃)₄ with a methylchlorid group the globular sphere is expanded in 1-chloro-2,2-dimethylpropane (CH₃)₃C(CH₂Cl). With the aid of DSC measurements, X-ray powder diffraction, ¹H NMR and ³⁵Cl NQR measurements two orientationally disordered (plastic) phases were established. The low temperature structure was solved and a structural model of phase II is proposed. A mechanism to describe the reorientation in the different phases is given as well as a connectivity scheme between the phases is discussed.

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