Supramolecular structures containing ‘isolated’ pentaborate anions and non-metal cations: Crystal structures of [Me₃NCH₂CH₂OH][B₅O₆

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• 作者：Michael A. Beckett ; Catherine C. Bl ; Peter N. Horton ; Michael B. Hursthouse ; K. Sukumar Varma
• 关键词：H-bond interactions ; Non-metal cations ; Pentaborate ; Supramolecular structures ; X-ray diffraction
• 刊名：Journal of Organometallic Chemistry
• 出版年：2007
• 期刊代码：64_0022328x
• 类别：ch
• 出版时间：1 June 2007
• 卷：692
• 期：13
• 页码：2832-2838
• 文件大小：745 K

摘要

The solid-state structures of two non-metal pentaborates [Me₃NCH₂CH₂OH][B₅O₆(OH)₄] (1) and [4-MepyH, 4-Mepy][B₅O₆(OH)₄] (2) have been determined by single-crystal X-ray diffraction methods. Structures 1 and 2 both contain supramolecular pentaborate frameworks held together by extensive H-bond interactions. The framework of 1 exists essentially as planes of pentaborate anions linked via three pairwise ‘planar’ β → α interactions, with a fourth β → β interaction crosslinking the planes. The framework of 2 is very similar except that one of the three pairwise linkages within the plane is replaced by pairwise ‘step-like’ bifurcated H-bonds to both α sites of a neighboring anion. The cations in 1 and the cations and neutral 4-Mepy ligands in 2 are present in the framework cavities and channels, with additional H-bond interactions existing between cations and anions.