INFRARED AND RAMAN SPECTROSCOPIC STUDY OF ION PAIRING OF STRONTIUM(II) AND BARIUM(II) BY THIOCYANATES IN LIQUID AMMONIA

Abstract

Infrared and Raman spectroscopy techniques have been used to study the ionic interactions of strontium(II) and barium(II) with thiocyanate ion in liquid ammonia. A number of bands were observed in both n (CN) and n (CS) regions of infrared and Raman spectra and these were assigned to 1:1 contact ion pair, [M2+----NCS]+; band (B) to a triple-ion, SCN---- M2+----NCS; band (C) to solvent-shared ion pair, [(NH3)xM2+¬ NH3----NCS]+; band (D) to a ;free; thiocyanate anion SCN- and band (E) to an upper stage transition arising from the excitation of a linear species already in a vibrational level above the ground state. (Received September 28, 2001; revised April 10, 2002) Bull. Chem. Soc. Ethiop. 2002, 16(1), 65-72.