Estimation of the N-F Bond Distance in NF(+) sub 4 from its General Valence Force Field

摘要

Although the NF4(+) cation has been known for two decades, so far all attempts have failed to obtain a crystal structure of one of its salts and thus a value for its N-F bond length. Based on its known general valence force field, the N-F bond length of NF4(+) has been estimated at 1.24 A. Since this value is unusually short and disagrees with that of 1.32A recently predicted by ab initio studies, the basis for the previous estimate of 1.24A was reexamined. The estimate of the bond length in NF4(+) from the published general valence force field was revised and a value of 1.31A is suggested.