Vibrational spectra of halogen-bridged systems. Part II. Au2Cl6, Al2Br6, Al2I6, and In2I6

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Abstract
Infrared and partial Raman data are reported and assigned for the title compounds. A normal-co-ordinate analysis has been made for auric chloride. The most significant result of the calculation is that the bridge bond stretching force constant in auric chloride is 73% that of the terminal bond, whereas it is approximately 50% in aluminium chloride; this difference is rationalised and generalised.