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HSbCl₆ was prepared by treating chemically
pure SbCl₅ with 10% (~3 N) hydrochloric acid,
both of the reagents were precooled to the
temp of ice water. [left margin]a fuming liquid[/margin]

HSbCl₆ is unstable at room temperatures
Signal amplitude was reduced to about 20% after
standing for 24 hours.

Suggestion: mean life time of the compound
can be measured with the spectrometer.