Spectrochemistry of Solutions: A Vibrational Spectroscopic Study of Ion Pairing and Upper Stage Transition of Magnesium (II) and Calcium (II) by Thiocyanates in Liquid Ammonia

  • Dicky D.K. Chingakule
  • Peter Gans
  • J. Bernard Gill


Ion pairing and upper stage transition of magnesium (II) and calcium (II) with thiocyanate ion has been studied by Infrared and Raman spectroscopy. A complete picture of species present in thiocyanate solutions has been established. The spectral profile consists of five thiocyanate species namely; a triple-ion, [SCN - M - NCS]1:1 contact ion pair (M - NCS] solvent-shared ion pair (NH) M - NH - NCS] “free” thiocyanate ion (SCN) and an upper stage transition arising from the excitation of a linear species already in a vibrational level above the ground state i.e. v2 bending vibration. This was a feature observed on the lower wavelength.

UNISWA Research Journal of Agriculture, Science and Technology Vol. 4 (1) 2000: pp 10-15

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eISSN: 1029-9645