多中心卤键的直接证据：三苯基膦二卤化物中 P-XXX-P 片段的意外收缩。
Direct evidence of a multicentre halogen bond: unexpected contraction of the P-XXX-P fragment in triphenylphosphine dihalides.
机构信息
Centre for Synthesis and Chemical Biology, School of Chemistry and Chemical Biology, University College Dublin, Ireland.
出版信息
Chem Commun (Camb). 2013 Feb 18;49(14):1434-6. doi: 10.1039/c2cc38363b.
PMID:23322232
Abstract
Triphenylhalophosphonium halides, Ph(3)PX(2), form crystals comprising bridged linear cations Ph(3)P-X-X-X-PPh(3) where the X(3) bridge is shortened from 6.56 Å in Cl-Cl-Cl to 6.37 Å in the Br-Br-Br system. It is proposed that this structure is stabilised by five-centre/six-electron (5c-6e) hypervalent interactions.
摘要
三苯基卤化膦卤化物，Ph(3)PX(2)，形成包含桥连线性阳离子 Ph(3)P-X-X-X-PPh(3) 的晶体，其中 X(3) 桥从 Cl-Cl-Cl 中的 6.56 Å 缩短至 Br-Br-Br 体系中的 6.37 Å。据提议，这种结构由五中心/六电子（5c-6e）超价相互作用稳定。
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