Cs 2 PdSe 8 (1), a novel palladium polyselenide with a three-dimensional open framework structure, has been synthesized via a solvothermal reaction using ethylenediamine as solvent. Its crystal structure has been determined by single crystal X-ray diffraction. The structure belongs to the tetragonal space groupI4 1 /acd(No. 142),a=14.935(2),c=12.907(3) Å,V=2897.0(8) Å 3 ,Z=8,R 1 =0.044, andwR 2 =0.063, for 640 unique reflections. The unique three-dimensional network is composed of two 3 ∞ [Pd(Se 4 ) 2 ] 2- frameworks that are topologically identical and mutually insertional. Each framework is built upon by connecting the neighboring square-planar [Pd(Se 4 ) 2 ] 2- units to generate an infinite assembly resembling alternating right- and left-handed helices running along thec-axis. Thermal analysis (TGA) showed that compound 1 is stable up to 320 °C. Optical studies performed on the powder sample of 1 suggested that the compound is a semiconductor and a band gap of 1.5 eV was estimated from the diffuse reflectance data.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Condensed Matter Physics
- Physical and Theoretical Chemistry
- Inorganic Chemistry
- Materials Chemistry