Infrared, polarized Raman and ab initio calculations of the vibrational spectra of [N(C3H7)4]2Cu 2Cl6 crystals

Abderrazek Oueslati*, Alain Bulou, Florent Calvayrac, Karim Adil, Mohamed Gargouri, Faouzi Hlel

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

36 Scopus citations


The room temperature structure of crystallized [N(C3H 7)4]2Cu2Cl6 is triclinic with P1 space group. It exhibits two sublattices made up of [Cu 2Cl6]2- bitetrahedra and tetrapropylammonium N(C3H7)4+ layers. The vibrational characteristics have been measured at room temperature by infrared spectroscopy (400-4000 cm-1) on polycrystalline samples, and by polarized Raman spectroscopy (30-3500 cm-1) on microcrystals orientated with respect to the organic and inorganic sublattices. The strongly polarized Raman spectra at low wavenumbers are consistent with the existence of orientated [Cu 2Cl6]2- bitetrahedra that exhibit a quasi C2h symmetry. Ab initio calculations using Gaussian 98 set of quantum chemistry code are performed by DFT approach with B3LYP to predict the set of normal modes characteristics of free [Cu2Cl6] 2-. The reliability of 3-21G, 6-31G(d) and LanL2DZ basis functions has been first checked in the case of [CuCl4]2- for which the results can be compared with experimental data previously reported. The low wavenumbers Raman spectra of [N(C3H7)4] 2Cu2Cl6 are analysed and the lines are assigned on the basis of group theory and the ab initio calculation results. The whole vibrational characteristics of the [Cu2Cl6]2- bitetrahedra are given.

Original languageEnglish (US)
Pages (from-to)10-20
Number of pages11
JournalVibrational Spectroscopy
StatePublished - 2013

Bibliographical note

Funding Information:
The authors thank Professor Mohamed Bahri for fruitfull comments, and CNRS and DGRST for financial support (CNRS/DGRST agreement no. 24438).


  • Ab initio calculations
  • Bis(tetrapropylammonium)
  • Hexachloridodicuprate (II)
  • Infrared spectroscopy
  • Polarized Raman spectroscopy

ASJC Scopus subject areas

  • Spectroscopy


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