Supramolecular structures containing 'isolated' pentaborate anions and non-metal cations: Crystal structures of [Me3NCH2CH2OH][B5O6(OH)(4)] and [4-MepyH, 4-Mepy][B5O6(OH)(4)]

Beckett, M.A.C.C., Horton, P.N., Hursthouse, M.B. and Varma, K.S. (2007) Supramolecular structures containing 'isolated' pentaborate anions and non-metal cations: Crystal structures of [Me3NCH2CH2OH][B5O6(OH)(4)] and [4-MepyH, 4-Mepy][B5O6(OH)(4)]. Journal of Organometallic Chemistry, 692 (13), 2832-2838. (doi:10.1016/j.jorganchem.2007.02.038).

Abstract

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’ ? ? greek small letter alpha interactions, with a fourth ? ? ? 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 greek small letter alpha 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.

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Contributors

Author: P.N. Horton

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