Molecular motions and phase transitions in halogen-bridged one-dimensional complexes [Pt(en)2][PtX2(en)2](ClO4)4 (X: I, Br)

Literature Information

Publication Date 2001-04-03
DOI 10.1039/B009646F
Impact Factor 3.676
Authors

Noriyoshi Kimura, Toru Hachisuka, Yukitaka Nakano, Ryuichi Ikeda


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Abstract

1H and 2H NMR and thermal measurements were performed on crystalline [Pt(en)2][PtI2(en)2](ClO4)4 in which protonated and partially deuterated ethylenediamines H2N(CH2)2NH2, D2N(CH2)2ND2 and H2N(CD2)2NH2 were used as the ligand “en”. A metastable crystalline phase of [Pt(en)2][PtBr2(en)2](ClO4)4 with conformational disorder of the en chelate rings was shown to have a different phase transition at ca. 380 K to the stable crystalline form of the ordered structure. NMR spectra and relaxation times showed that the distribution of the en conformation is not static but dynamic in both I and Br complexes where a puckering motion of en chelate rings was shown to take place between asymmetric potential wells.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
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