The libration-vibration bands of the ammonium ion in ammonium tetraphenylborate: Evidence for nearly free rotation

Article abstract of DOI:10.1063/1.453470

The N-H stretching and H-N-H bending regions of the infrared spectrum of the title compound (ATPB) have been examined with care. The stretching bands show rotation-like structure that we attribute to rotational motion of NH ₄⁺ in a very low barrier. The barrier has the symmetry of a tetrahedral molecule in a tetrahedral site and is characterized by the dimensionless parameter β=1. The J=0 and J=1 levels are below the barrier and the J=2 levels are above it. Slow interconversion of nuclear spin species is seen in keeping with the low barrier model. The spectra of the ATPB with some NH₃D⁺, with a high concentration of K⁺ and with deuterated phenyl groups have been examined, and show spectra in keeping with the model.

Full text of DOI:10.1063/1.453470

The libration–vibration bands of the ammonium ion in ammonium
tetraphenylborate: Evidence for nearly free rotation
Malcolm P. Roberts, Dolores ClavellGrunbaum, and Herbert L. Strauss
Citation: J. Chem. Phys. 87, 6393 (1987); doi: 10.1063/1.453470
View online: http://dx.doi.org/10.1063/1.453470
View Table of Contents: http://jcp.aip.org/resource/1/JCPSA6/v87/i11
Published by the AIP Publishing LLC.
Additional information on J. Chem. Phys.
Journal Homepage: http://jcp.aip.org/
Journal Information: http://jcp.aip.org/about/about_the_journal
Top downloads: http://jcp.aip.org/features/most_downloaded
Information for Authors: http://jcp.aip.org/authors
Downloaded 16 Aug 2013 to 129.78.139.28. This article is copyrighted as indicated in the abstract. Reuse of AIP content is subject to the terms at: http://jcp.aip.org/about/rights_and_permissions

Downloaded 16 Aug 2013 to 129.78.139.28. This article is copyrighted as indicated in the abstract. Reuse of AIP content is subject to the terms at: http://jcp.aip.org/about/rights_and_permissions

Downloaded 16 Aug 2013 to 129.78.139.28. This article is copyrighted as indicated in the abstract. Reuse of AIP content is subject to the terms at: http://jcp.aip.org/about/rights_and_permissions

Downloaded 16 Aug 2013 to 129.78.139.28. This article is copyrighted as indicated in the abstract. Reuse of AIP content is subject to the terms at: http://jcp.aip.org/about/rights_and_permissions

Downloaded 16 Aug 2013 to 129.78.139.28. This article is copyrighted as indicated in the abstract. Reuse of AIP content is subject to the terms at: http://jcp.aip.org/about/rights_and_permissions

Downloaded 16 Aug 2013 to 129.78.139.28. This article is copyrighted as indicated in the abstract. Reuse of AIP content is subject to the terms at: http://jcp.aip.org/about/rights_and_permissions

Downloaded 16 Aug 2013 to 129.78.139.28. This article is copyrighted as indicated in the abstract. Reuse of AIP content is subject to the terms at: http://jcp.aip.org/about/rights_and_permissions

Downloaded 16 Aug 2013 to 129.78.139.28. This article is copyrighted as indicated in the abstract. Reuse of AIP content is subject to the terms at: http://jcp.aip.org/about/rights_and_permissions

Downloaded 16 Aug 2013 to 129.78.139.28. This article is copyrighted as indicated in the abstract. Reuse of AIP content is subject to the terms at: http://jcp.aip.org/about/rights_and_permissions

Downloaded 16 Aug 2013 to 129.78.139.28. This article is copyrighted as indicated in the abstract. Reuse of AIP content is subject to the terms at: http://jcp.aip.org/about/rights_and_permissions

Downloaded 16 Aug 2013 to 129.78.139.28. This article is copyrighted as indicated in the abstract. Reuse of AIP content is subject to the terms at: http://jcp.aip.org/about/rights_and_permissions

Downloaded 16 Aug 2013 to 129.78.139.28. This article is copyrighted as indicated in the abstract. Reuse of AIP content is subject to the terms at: http://jcp.aip.org/about/rights_and_permissions

Downloaded 16 Aug 2013 to 129.78.139.28. This article is copyrighted as indicated in the abstract. Reuse of AIP content is subject to the terms at: http://jcp.aip.org/about/rights_and_permissions

Downloaded 16 Aug 2013 to 129.78.139.28. This article is copyrighted as indicated in the abstract. Reuse of AIP content is subject to the terms at: http://jcp.aip.org/about/rights_and_permissions