
%0 Journal Article
%A Fergusson, JE 
%A Scaife, DE 
%T Chlorine nuclear quadrupole resonance studies of K<sub>2</sub>IrCl<sub>6</sub>-K<sub>2</sub>PtCl<sub>6</sub> solid solutions
%J Australian Journal of Chemistry
%D 1971/07/01
%V 24
%N 7
%P 1325-1329
%K 
%R https://doi.org/10.1071/CH9711325
%U https://www.publish.csiro.au/paper/CH9711325 
%X The cubic lattice parameters for the solid solution system K2IrCl6- K2PtCl6 vary approximately linearly with composition from a0 = 9.765±0.001 &#506; for K2,IrCl6, to a0 = 9.748±0.001 &#506; for K2PtCl6. The 35Cl n.q.r, frequencies show shifts from the frequencies observed in the pure compounds, these shifts being approximately linear with composition at each of the temperatures 77°K, 201°K, and 298°K. The shifts in frequency on going from 0-100% Pt are, for the chlorine atoms bonded to the iridium, +93 kHz, and for the chlorine atoms bonded to the platinum, +84 kHz.     The infrared stretching frequencies of the MCl62- groups also show shifts which are approximately linear with composition. The extrapolated shifts in going from 0-100% Pt are +11 cm-1 and +4.5 cm-1 for the Pt-Cl and Ir-Cl stretching frequencies, respectively. The n.q.r. and infrared results are best accounted for by small changes in the M-Cl bond lengths within the MCl62- group, with concurrent changes in a0, and possibly also in the positional parameter u. Re-examination of the variation of magnetic susceptibility with composition in the K2IrCl6-K2PtCl6 system is also reported, and reasons proposed for the form of this variation.     35Cl n.q.r. frequencies are reported for Cs2IrCl6. 
