Cs{sub 2}PdSe{sub 8}: A unique open framework structure with double helical assemblies of [Pd(Se{sub 4}){sub 2}]{sup 2{minus}}

Journal Article · Thu Oct 01 04:00:00 EDT 1998 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1006/jssc.1998.7950· OSTI ID:305397

Li, J; Chen, Z; Wang, R J; Lu, J Y ^[1]

---

1. Rutgers Univ., Camden, NJ (United States). Dept. of Chemistry

Cs{sub 2}PdSe{sub 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 group I4{sub 1}/acd (No. 142), a = 14.935(2), c = 12.907(3) {angstrom}, V = 2897.0(8) {angstrom}{sup 3}, Z = 8, R{sub 1} = 0.044, and wR{sub 2} = 0.063, for 640 unique reflections. The unique three-dimensional network is composed of two {sub {infinity}}{sup 3}[Pd(Se{sub 4}){sub 2}]{sup 2{minus}} frameworks that are topologically identical and mutually insertional. Each framework is built upon by connecting the neighboring square-planar [Pd(Se{sub 4}){sub 2}]{sup 2{minus}} units to generate an infinite assembly resembling alternating right- and left-handed helices running along the c-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.

• Sponsoring Organization: National Science Foundation, Washington, DC (United States)
• OSTI ID: 305397
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 1 Vol. 140; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CESIUM SELENIDES
CRYSTAL STRUCTURE
DATA
LATTICE PARAMETERS
PALLADIUM SELENIDES
THERMAL ANALYSIS
X-RAY DIFFRACTION