Ring currents in six-membered heterocycles: the diazaborinines (CH)2B2N2
Titel:
Ring currents in six-membered heterocycles: the diazaborinines (CH)2B2N2
Auteur:
Cernusak, I. Fowler, P. W. Steiner, E.
Verschenen in:
Molecular physics
Paginering:
Jaargang 98 (2000) nr. 14 pagina's 945-953
Jaar:
2000-07-20
Inhoud:
Six of the eleven possible cyclic isomers (CH)2B2N2 are found, by geometric optimization at a correlated level of theory, to have planar closed-shell ground states. Current density maps calculated with distributed-origin coupled Hartree-Fock theory wavefunctions show that all six of these have delocalized pi-electron systems supporting diamagnetic ring currents. In comparison with benzene at the same level of theory, the isomer with lowest energy, 1,3,2,4 diazadiborinine, has a 5% greater centre of ring shielding, but 20-25% smaller mean magnetizability, mean polarizability and polarizability anisotropy.