Journal
SUPRAMOLECULAR CHEMISTRY
Volume 22, Issue 2, Pages 73-80Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/10610270903045318
Keywords
alkali metal; ammonium ion; cation-pi interaction; mass spectrometry; tetraphenylborate
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Funding
- NSF [CHE-0415586]
- NIH [GM 36262]
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Sodium, potassium, rubidium, caesium, ammonium and tetramethylammonium tetraphenylborates were studied by both positive and negative ion electrospray mass spectrometry. An affinity order of Cs+ > Rb+ > K+ similar to Na+ was obtained. The results obtained were compared with both calculations and solid-state structures, where available. The previously reported high affinity of caesium for tetraphenylborate concluded from NMR experiments was confirmed for the gas phase. The affinity does not appear to result from steric effects and a cation-pi interaction seems likely. In the positive ion mode, a unique acetonitrile complex of NaBPh4 was observed.
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