New Compounds with [As7]3− Clusters: Synthesis and Crystal Structures of the Zintl Phases Cs2NaAs7, Cs4ZnAs14 and Cs4CdAs14

Crystals

Hua He¹  Chauntae Tyson¹ 

[1] Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, USA;

关键词: cluster;    arsenic;    Zintl compound;    crystal structure;   

DOI  :  10.3390/cryst1030087

来源: mdpi

【 摘 要 】

Three new cluster compounds, Cs₂NaAs₇, Cs₄ZnAs₁₄, and Cs₄CdAs₁₄ were obtained from high temperature reactions. Their structures feature heptaarsenide [As₇]³⁻ anions, where the clusters in Cs₄ZnAs₁₄ and Cs₄CdAs₁₄ are dimerized by the linkers Zn and Cd, respectively. The bonding characteristics of these clusters are discussed and compared. Band structure calculation on Cs₂NaAs₇ suggests that this compound is a semiconductor with an energy gap of circa 1.6 eV, which is in consistent with the dark red color of the crystals.

【 授权许可】

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