X-ray and optical study on the PtCl chain structure in [Pt(en)2][Pt(en)2Cl2](BF4)4

• Published in: Journal of the Physical Society of Japan Vol. 67; no. 1; pp. 186 - 191
• Main Authors: WAKABAYASHI, Y, WAKABAYASHI, N, KURODA, N, NISHIDA, M, MATSUSHITA, N
• Format: Journal Article
• Language: English
• Published: Tokyo Institute of Pure and Applied Physics 1998; Physical Society of Japan; The Physical Society of Japan
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Equations of state, phase equilibria, and phase transitions; Exact sciences and technology; Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity); Optical constants: refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Optical properties of bulk materials and thin films; Physics; Solid-solid transitions; Specific phase transitions; X-ray scattering; Transition element complexes; Phase transformations; Phonon dispersion; Experimental study; Charge transfer; Optical absorption; Platinum complexes
• ISSN: 0031-9015; 1347-4073
• DOI: 10.1143/jpsj.67.186

X-ray diffraction and optical absorption measurements were carried out on single crystals of [Pt(en)2][Pt(en)2Cl2](BF4)4 (en = etylenediamine). This compound has a quasi-one dimensional structure with alternating (II and IV) Pt valences along the c-axis. An orthorhombic to monoclinic structural phase transition occurs around 255 K and the charge-transfer absorption edge was found to have a sudden shift at the transition. X-ray diffuse scattering was observed around (0 0 2n + 1) reciprocal points. While optical spectra were affected by irradiating the sample with blue light, the X-ray diffraction intensity did not change either by irradiation or by varying the sample temperature. We attribute the diffuse scattering to solitons produced during crystal growth. From measurements of thermal diffuse scattering, limited information about the phonon dispersion relation was obtained.