Concepedia

Spectroscopy study of [Ni(NH<sub>3</sub>)<sub>6</sub>]X<sub>2</sub> compounds. III reorientational correlation times of NH<sub>3</sub> and ClO<sub>4</sub> groups in [Ni(NH<sub>3</sub>)<sub>6</sub>](ClO<sub>4</sub>)<sub>2</sub>

B. Janik, J.M. Janik, J.A. Janik

Journal of Raman Spectroscopy · 1978 · 16 citations · 4 references

DOI

Concepts

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.

References

4

An explanation of the electron paramagnetic transitions and low temperature entropy anomalies of hexammine nickel halides

A R Bates, K W H Stevens · Journal of Physics C Solid State Physics · 1969 · 49 citations

, , +19

Specific heat of solid [Ni (NH3)6] (ClO4)2 in the temperature range from 115 to 300 K

M. Rachwalska, J.M. Janik, J.A. Janik et al. · physica status solidi (a) · 1975 · 31 citations

, , +11

The X-ray powder investigation of phase transitions in [Ni(NH3)6] (ClO4)2

S. Hodorowicz, M. Ciechanowicz‐Rutkowska, J.M. Janik et al. · physica status solidi (a) · 1977 · 23 citations

, , +16

Spectroscopic study of [Me(NH<sub>3</sub>)<sub>6</sub>]X<sub>2</sub> compounds. I‐Raman study of phase transitions in [Ni(NH<sub>3</sub>)<sub>6</sub>](ClO<sub>4</sub>)<sub>2</sub> and [Ni(ND<sub>3</sub>)<sub>6</sub>](ClO<sub>4</sub>)<sub>2</sub>

J.A. Janik, T. Sarga, J.M. Janik et al. · Journal of Raman Spectroscopy · 1977 · 11 citations

, , +19