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Ab Initio investigation of the structures and stabilities of CH2N2, CHFN2, and CF2N2 isomers: Important consequences of MP2 optimizations

✍ Scribed by Alexander I. Boldyrev; Paul v. R. Schleyer; D. Higgins; Colin Thomson; Sofia S. Kramarenko

Publisher
John Wiley and Sons
Year
1992
Tongue
English
Weight
903 KB
Volume
13
Category
Article
ISSN
0192-8651

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✦ Synopsis

A b initio calculations of the potential energy surfaces of CHzNz, CHFNz, and CFzNz at MP4SDTQ/6-31G*// MP2(fu11)/6-31G* reveal several surprising features. While diazomethane is more stable than diazirine, only the three-membered ring forms of the fluorine-substituted isomers are known experimentally. We find fluorodiazomethane and difluorodiazomethane not to be viable species: They have no barriers toward exothermic dissociation into Nz and CHF or CFz, respectively. In contrast, the three-membered ring isomers, fluorodiazirine and difluorodiazirine, have high barriers toward dissociation despite being high in energy. Diazomethane bends easily; a nonplanar C, minimum is found at MP2(fu11)/6-31G* but Czv symmetry is preferred at QCISD/6-31G*.

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