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Cooperative binding in a phosphine oxide-based halogen bonded dimer drives supramolecular oligomerization

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Abstract

Triphenylphosphine oxide forms halogen-bonded (XB) complexes with pentafluoroiodobenzene and a 1,4-diaryl-5-iodotriazole. The stability of these complexes is assessed computationally and by 31P NMR spectroscopy in d8-toluene solution, where both complexes are weakly associated. This knowledge is applied to the design and synthesis of two self-complementary phosphine oxide-iodotriazole hybrids that incorporate a phosphine oxide XB acceptor and a 1,4-diphenyl-5-iodotriazole XB donor within the same molecule. The self-complementary design of these modules facilitates their assembly in both d8-toluene and, surprisingly, d2-DCM into dimers, with significant stabilities, through the formation of halogen-bonded diads. The stability of these assemblies is a result of significant levels of cooperative binding that is present in both solvents. The connection of two of these hybrid units together, using a flexible spacer, facilitates the aggregation of these modules in d2-DCM solution, through halogen bonding, forming oligomeric assemblies.
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Original languageEnglish
Pages (from-to)1986–1995
Number of pages10
JournalJournal of Organic Chemistry
Volume82
Issue number4
Early online date20 Jan 2017
DOIs
Publication statusPublished - 17 Feb 2017

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