The temperature variation o f 35C1 and 81 Br N Q R frequencies are reported for mercuric chloride ■ triethylene glycol dimethyl ether (H gC l2 • triglyme), mercuric chloride ■ diethylene glycol dimethyl ether (H gC l2 • diglym e), and mercuric bromide • diethylene glycol dimethyl ether (HgBr2 • diglym e). The frequencies have been assigned to the appropriate halogens using molecular models which take into account the various intra-and inter-molecular interactions in the solid state. The observed temperature variation o f the NQ R frequencies, in the range 7 7 -3 0 0 K. has been analysed using the two torsional m ode analysis in the framework o f the Bayer-Kushida-Brown m ethod with Tatsuzaki's correction to obtain the torsional frequencies and their average temperature coefficients.
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