Tunable Crystal-to-Crystal Phase Transition in a Cadmium Halide Chain Polymer

Polymers

Kevin Lamberts¹  Irmgard Kalf¹  Amr Ramadan¹  Paul Müller¹  Richard Dronskowski¹ 

[1] Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1, 52056 Aachen, Germany;

关键词: tunable phase transition;    crystal-to-crystal transformation;    chain polymer;    cadmium compounds;    X-ray powder diffraction;    single-crystal X-ray diffraction;    twinning;    ion chromatography;   

DOI  :  10.3390/polym3031151

来源: mdpi

【 摘 要 】

The chain polymer(X = Cl, Br; py = pyridine) undergoes a fully reversible phase transition between a monoclinic low-temperature and an orthorhombic high-temperature phase. The transformation can be directly monitored in single crystals and can be confirmed for the bulk by powder diffraction. The transition temperature can be adjusted by tuning the composition of the mixed-halide phase: Transition temperatures between 175 K up to the decomposition of the material at ca. 350 K are accessible. Elemental analysis, ion chromatography and site occupancy refinements from single-crystal X-ray diffraction agree with respect to the stoichiometric composition of the samples.

【 授权许可】

CC BY   
© 2011 by the authors; licensee MDPI, Basel, Switzerland.