title: Theoretical investigation on the protonation reactions and products of the stable [N,C,C,S] isomers.
abstract: A theoretical study on the protonation system of [N,C,C,S], [H,N,C,C,S]+, was performed at the B3LYP/6-311++G(d,p) and CCSD(T)/6-311++G(2df,2p) (single point) levels of theory. On the doublet [H,N,C,C,S]+ surface, 24 species were located as energy minima and 10 of them were considered as kinetically stable species. The species HNCCS+ with 2A' state and a shallow W-shaped skeleton was predicted to be the global minimum and kinetically the most stable species, being in good agreement with previous experimental findings. Furthermore, the protonation reactions of the stable [N,C,C,S] isomers were investigated in detail. The calculation results indicated that the [N,C,C,S] isomers may be significantly stabilized upon protonation. Finally, the possible covalent structures of the [H,N,C,C,S]+ isomers with considerable stability were briefly discussed.
authors.affiliation: School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080, People's Republic of China.
authors.forename: Wei
authors.initials: W
authors.lastname: Kan
authors.forename: Hai-Tao
authors.initials: HT
authors.lastname: Yu
authors.forename: Hong-Gang
authors.initials: HG
authors.lastname: Fu
authors.forename: Yi-Qun
authors.initials: YQ
authors.lastname: Wu