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

Abstract

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