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the neutral base must approach closer to the Sn2 center than the charged base for the same extent of CH3F distortion, C-F (leaving) charge buildup and bond weakening, and C-base bond formation.

The recent isolation of isofulminic acid has opened the door for a comparative study of all the four possible CHNO isomers: isocyanic acid, cyanic acid, fulminic acid, and isofulminic acid. Their infrared spectra have been measured in an argon matrix at 13 K and are compared with the results of ab initio calculations.

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