Takudrei

074
Weak interactions between resorcinarenes and diquaternary alkyl ammonium cations

H. Mansikkamäki, C. A. Schalley, M. Nissinen, K. Rissanen— 2004

The interactions of resorcin[4]arenes 1 with alkyl ammonium cations bearing a 1,4-diazabicyclo[2.2.2]octane (DABCO) scaffold (32+, 42+ and 52+) were analyzed in the solid state by X-ray crystallography, in solution by 1H NMR spectroscopy, and in the gas phase by ESI-TOF mass spectrometry. The results are complemented with AM1 calculations and compared to previous reports on complexation studies of resorcinarenes with quaternary alkyl ammonium cations. The NMR titration results indicate that there are hardly any differences in the binding of the quaternary tetramethyl ammonium cation 2+ and the diquaternary N,N’-dimethyl DABCO dication 42+. The large N,N’-dibenzyl DABCO dication 52+ has two potential sites for inclusion, that is, the aryl groups and the central cationic part, and the complexation and interactions of both sites with 1 were verified in the NMR studies as well as in the solid state structures.

Title074
Weak interactions between resorcinarenes and diquaternary alkyl ammonium cations
AuthorH. Mansikkamäki, C. A. Schalley, M. Nissinen, K. Rissanen
Date20041209
IdentifierDOI 10.1039/b415401k
Source(s)
CitationNew J. Chem. 2005, 29, 116-127