Preparation of [Cr(NH3)6](NO3)3 with Liquid Ammonia
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چکیده
Anhydrous liquid ammonia has a boiling point of -33.35 C, which might suggest that it would be a difficult material to handle, particularly in light of the familiar noxious odor of the gas. However, owing to hydrogen bonding, liquid ammonia has a relatively high heat of vaporization (23.3 J/mol vs. 40.7 J/mol for H2O). Thus, if kept in an insulated vessel (e.g., a Dewar flask), its rate of vaporization is sufficiently slow and controlled to make it a practical nonaqueous medium. If all work is done in a good fume hood, liquid ammonia poses no extraordinary hazards.
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