Vibrational spectra and structures of urazole and 4-methylurazole: DFT calculations of the normal modes in aqueous solution and in the solid state, and the influence of hydrogen bonding

John P. Ryall, Trevor J. Dines, Babur Z. Chowdhry, Stephen A. Leharne, Robert Withnall

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    Abstract

    Solid-state IR and Raman as well as aqueous solution state Raman spectra are reported for urazole, 4-methylurazole and their deuterated derivatives. DFT calculations, at the B3-LYP/cc-pVTZ level, established that the structures and vibrational spectra of the molecules can be interpreted using models with hydrogen-bonded water molecules, in conjunction with the polarizable continuum solvation method. The vibrational spectra were computed at the optimised molecular geometry in each case, enabling normal coordinate analysis, which yielded satisfactory agreement with the experimental IR and Raman data. Computed potential energy distributions of the normal modes provided detailed vibrational assignments. Solid-state pseudopotential-plane-wave DFT calculations, using the PW91 functional were also carried out, reflecting the importance of intermolecular hydrogen bonding in the solid state. (C) 2010 Elsevier B. V. All rights reserved.

    Original languageEnglish
    Pages (from-to)219-227
    Number of pages9
    JournalChemical Physics
    Volume373
    Issue number3
    DOIs
    Publication statusPublished - 3 Aug 2010

    Keywords

    • IR
    • Raman
    • DFT
    • Urazole
    • 4-Methylurazole
    • DENSITY
    • MOLECULES
    • ENERGIES
    • EXCHANGE

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