Ab initio molecular-orbital calculations have been carried out on the H,SiN+ cation (C,,). In contrast with the isovalent H&N+ ion (C,,), a triplet state ('AZ) is the most stable, but the singlet state ('A, ) appears to be a local minimum, even at correlated levels. However, this singlet species ise
An ab initio study of the formation and structure of H2CN+·N2
✍ Scribed by Tae-Kyu Ha; Minh Tho Nguyen
- Publisher
- Elsevier Science
- Year
- 1983
- Tongue
- English
- Weight
- 359 KB
- Volume
- 97
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
The energy difference between the HzCN*-N2 comples and its components, H2CN* 2nd N2. has been ulculated PS 89 and 6-4 kcal/mol by ab initio SW calculations employing the 4-31G and 6-31G** basis sets. These ~AICS agree with the previously estimated heat of formation of 7.65 kul/mol. The reaction pAthway of the ion-molecule reaction bctween H2CN+and N2 snd the structures of two stable reaction products have been studied in detail.
📜 SIMILAR VOLUMES
The ab initio energies. nuclear 3~x2 electran repulsions and charge distributions have been calcuiated using moderately large basis sets as a function of the R-C = N angie (R = NH,, NFt or PF2). The optimum R-C E N angles were calculated to be 178.9". 176.60. and 17S' for NH,&N, NF2CN, and PF2CN, re
The poteniiaI surface for the reaction H,CN+H\* -HCN+H + Hz has been studieu by ab initio SCF calculations, using gaussian-type basis functions. A saddle point on the surface has been found, and a reaction path is proposed to explain the observed reIease tii kinetic energy.
Several structures and electronic states of the C2N and CN2 molecules have been studied using complete active space SCF (CASSCF), multireference configuration interaction (MRCI ), and coupled cluster (CCSD( T) ) methods. Both molecules are very stable. Our best computed total atomization energies 10
An ab initio study of O=N-N=S with full geometry optimization has been carried out to corroborate the presence of an interaction between the terminal atoms in this type of structure, which, in O=N-N=O, apparently stabilizes the cis conformer. Using the unscaled 4-31G basis set with a full set of d f