Phosphorus-based functional groups as hydrogen bonding templates for rotaxane formation

Ahmed, Rehan, Altieri, Andrea, D’Souza, Daniel M., Leigh, David A., Mullen, Kathleen M., Papmeyer, Marcus, Slawin, Alexandra M.Z., Wong, Jenny K.Y., & Woollins, J. Derek (2011) Phosphorus-based functional groups as hydrogen bonding templates for rotaxane formation. Journal of the American Chemical Society, 133(31), pp. 12304-12310.

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Abstract

We report on the use of the hydrogen bond acceptor properties of some phosphorus-containing functional groups for the assembly of a series of [2]rotaxanes. Phosphinamides, and the homologous thio– and selenophosphinamides, act as hydrogen bond acceptors that, in conjunction with an appropriately positioned amide group on the thread, direct the assembly of amide-based macrocycles around the axle to form rotaxanes in up to 60% yields. Employing solely phosphorus-based functional groups as the hydrogen bond accepting groups on the thread, a bis(phosphinamide) template and a phosphine oxide-phosphinamide template afforded the corresponding rotaxanes in 18 and 15 % yields, respectively. X-Ray crystallography of the rotaxanes shows the presence of up to four intercomponent hydrogen bonds between the amide groups of the macrocycle and various hydrogen bond accepting groups on the thread, including rare examples of amide-to-phosphonamide, -thiophosphinamide and -selenophosphinamide groups. With a phosphine oxide-phosphinamide thread, the solid state structure of the rotaxane is remarkable, featuring no direct intercomponent hydrogen bonds but rather a hydrogen bond network involving water molecules that bridge the H-bonding groups of the macrocycle and thread through bifurcated hydrogen bonds. The incorporation of phosphorus-based functional groups into rotaxanes may prove useful for the development of molecular shuttles in which the macrocycle can be used to hinder or expose binding ligating sites for metal-based catalysts.

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ID Code: 72048
Item Type: Journal Article
Refereed: Yes
DOI: 10.1021/ja2049786
ISSN: 1520-5126
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2011 American Chemical Society
Deposited On: 25 May 2014 23:02
Last Modified: 01 Jun 2014 03:58

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