Spectroscopy study of [Ni(NH3)6]X2 compounds. III reorientational correlation times of NH3 and ClO4 groups in [Ni(NH3)6](ClO4)2
Abstract
Abstract By applying the Raman band profile analysis method, reorientational correlation times of NH 3 groups and (ClO 4 ) − ions in [Ni(NH 3 ) 6 ] (ClO 4 ) 2 , have been obtained. These times are of the order of psec at room temperature. They increase with decreasing temperature. NH 3 reorientations do not show any significant changes when the temperature passes the phase transition region (173 K–143 K). (ClO 4 ) − reorientations, on the other hand stop abruptly at the phase transition in 173 K. A comparison with IR and neutron scattering results leads to a choice of 120° angular jumps as the NH 3 reorientational model.
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