Affiliation:
1. State Key Laboratory of Element-Organic Chemistry Tianjin Key Lab for Rare Earth Materials and Applications School of Materials Science and Engineering Nankai University Tianjin 300350 China
2. Department of Chemistry University of Oxford South Parks Road Oxford OX1 3QR UK
Abstract
AbstractWe report here the synthesis and structural characterization of the first binary iron arsenide cluster anion, [Fe3(As3)3(As4)]3−, present in both [K([2.2.2]crypt)]3[Fe3(As3)3(As4)] (1) and [K(18‐crown‐6)]3[Fe3(As3)3(As4)]⋅en (2). The cluster contains an Fe3 triangle with three short Fe−Fe bond lengths (2.494(1) Å, 2.459(1) Å and 2.668(2) Å for 1, 2.471(1) Å, 2.473(1) Å and 2.660(1) Å for 2), bridged by a 2‐butene‐like As4 unit. An analysis of the electronic structure using DFT reveals a triplet ground state with direct Fe−Fe bonds stabilizing the Fe3 core.
Funder
National Natural Science Foundation of China
Natural Science Foundation of Tianjin City
Ministry of Education-China Mobile Research Fund Project