The role of sequestering agents in the formation and structure of germanium anion cluster polymers

Craig Downie; Jiang-Gao Mao; Hiten Parmar; Arnold M Guloy

doi:10.1021/ic034704w

The role of sequestering agents in the formation and structure of germanium anion cluster polymers

Inorg Chem. 2004 Mar 22;43(6):1992-7. doi: 10.1021/ic034704w.

Authors

Craig Downie¹, Jiang-Gao Mao, Hiten Parmar, Arnold M Guloy

Affiliation

¹ Department of Chemistry and the Center for Materials Chemistry, University of Houston, Houston, TX 77204-5003, USA.

PMID: 15018521
DOI: 10.1021/ic034704w

Abstract

Large blue-green, transparent crystalline needles of [K-(2,2)diaza-[18]-crown-6]KGe(9).3en are prepared, in high yield, from the reaction of (2,2)diaza[18]-crown-6 in toluene with a solution of "KGe(4)" in ethylenediamine (en). The compound crystallizes in the orthorhombic space group Pnma (a = 10.9763(12) A, b = 27.265(3) A, c = 13.880(1) A; Z = 4). The crystal structure of [K-(2,2)diaza-[18]-crown-6]KGe(9).2en features one-dimensional [KGe(9)](-) bare intermetallic chains formed from the linking, via exo-bonds, of nido-Ge(9)(2-) clusters. Uncomplexed K atoms effectively cap the square bases of the monocapped square antiprismatic [Ge(9)](2-) clusters. The optical band gap of the title compound is 1.25 eV. The use of weaker sequestering agents in the isolation of Ge cluster anions from en solutions provides an additional handle in a controlled molecular route to preparing new low-dimensional Zintl phases.