Intramolecular and intermolecular N-H∙∙∙F-C hydrogen-bonding interactions in amine adducts of tris(pentafluorophenyl)borane and tris(pentafluorophenyl)alane
Mountford, Andrew J., Lancaster, Simon J., Coles, Simon J., Horton, Peter N., Hughes, David L., Hursthouse, Michael B. and Light, Mark E. (2005) Intramolecular and intermolecular N-H∙∙∙F-C hydrogen-bonding interactions in amine adducts of tris(pentafluorophenyl)borane and tris(pentafluorophenyl)alane. Inorganic Chemistry, 44, (16), 5921-5933. (doi: 10.1021/ic050663n).
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The reaction between B(C6F5)(3) and NH3(g) in light petroleum yielded the solvated adduct H3N center dot B(C6F5)(3)center dot NH3. Treatment with a second equivalent of B(C6F5)(3) afforded H3N center dot B(C6F5)(3). Attempts to prepare the analogous alane adduct were unsuccessful and resulted in protolysis. Related compounds of the form R'R"N(H)center dot M(C6F5)(3) were synthesized from M(C6F5)(3) and the corresponding primary and secondary amines (M = B, Al; R' = H, Me, CH2Ph; R" = Me, CH2Ph, CH(Me)(Ph); R'R" = cyclo-C5H10). The solid-state structures of 13 new compounds have been elucidated by single-crystal X-ray diffraction and are discussed. Each of the borane adducts has a significant bifurcated intramolecular hydrogen bond between an amino hydrogen and two o-fluorines, while N-(HF)-F-...-C interactions in the alane adducts are weaker and more variable. F-19 NMR studies demonstrate that the borane adducts retain the bifurcated C-(FHF)-H-...-F-...-C hydrogen bond in solution. Compounds of the type R'R"N(H)center dot M(C6F5)(3) conform to Etter's rules for the prediction of hydrogen-bonding interactions.
|Keywords:||crystal-structures, polymerization catalysis, olefin polymerization, ammonium complex, b(c6f5)(3), fluorine, water, h2o-center-dot-b(c6f5)(3), metallocene, orientation|
|Subjects:||Q Science > QD Chemistry|
|Divisions:||University Structure - Pre August 2011 > School of Chemistry
|Date Deposited:||02 Mar 2006|
|Last Modified:||01 Jun 2011 13:40|
|Contributors:||Mountford, Andrew J. (Author)
Lancaster, Simon J. (Author)
Coles, Simon J. (Author)
Horton, Peter N. (Author)
Hughes, David L. (Author)
Hursthouse, Michael B. (Author)
Light, Mark E. (Author)
|Date:||8 August 2005|
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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