The electronic structure of the tetrasulphur tetranitride dication, S4N42+: an abinitio molecular orbital study

1982 ◽  
Vol 60 (17) ◽  
pp. 2281-2285 ◽  
Author(s):  
Milan Trsic ◽  
William G. Laidlaw ◽  
Richard T. Oakley

Abinitio Hartree–Fock–Slater molecular orbital calculations on the planar tetrasulphur tetranitride dication S4N42+ reveal that it can be described as a fully delocalised 10 π-electron system. Overlap populations for the NS bonds suggest a bond order substantially stronger than in neutral S4N4. The strong uv/visible absorptions observed for S4N42+ at 346 and 262 nm are assigned to nπS → π* and nπN → π* excitations. The Hartree–Fock–Slater π-molecular orbital manifold is discussed in relation to simple HMO concepts.

1976 ◽  
Vol 29 (3) ◽  
pp. 465 ◽  
Author(s):  
D Poppinger

Ab initio molecular orbital calculations with minimal and extended basis sets have been carried out for the 1,3-dipolar addition of fulminic acid to acetylene, ethylene, ethynamine and propynenitrile. Optimized geometries are reported for the transition states HCNO+C2H2, HCNO+C2H4, HCNO+ C2HNH2, for the adducts isoxazole and 2-isoxazoline, and for nitrosocyclopropene as a possible intermediate. The calculations indicate that (a) these 1,3-dipolar reactions are synchronous processes, (b) the geometry of the transition state is insensitive to substitution and (c) of the isomeric substituted adducts, 5-aminoisoxazole and isoxazole-4-carbonitrile should be formed preferentially.


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