Infrared vibrational spectra of l-histidinium dihydrogen orthophosphate orthophosphoric acid (LHP) |
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| Authors: | E Espinosa B Wyncke F Bréhat X Gerbaux S Veintemillas E Molins |
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| Institution: | aL.C.M.3 b.-U.R.A. 809 C.N.R.S. Université Henri Poincaré, Nancy 1, B.P. 239, 54506 Vandoeuvre les Nancy Cedex, France;bInstitut de Ciència de Materials de Barcelona (C.S.I.C.), Campus de la U.A.B., 08193 Cerdanyola, Spain |
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| Abstract: | The entire vibrational spectrum of a single crystal of l-histidinium dihydrogen orthophosphate orthophosphoric acid (LHP) was studied by infrared (IR) spectroscopy from 10 up to 4000 cm−1. The polarized infrared (IR) reflectivity spectra were measured between 7 and 250 K, in the frequency range 10–600 cm−1. From the IR spectral analysis, the phonon modes were classified within their symmetry species, and their longitudinal (LO) and transversal (TO) optical frequencies were calculated. A tentative assignment of the various internal modes observed in the transmissivity spectrum of LHP, between 300 and 4000 cm−1, is proposed. The present study did not reveal any low-temperature structural phase transition. |
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| Keywords: | PACS: 78 20 D 78 30 |
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