The n bonds of acetylene and ethylene contain a minimum density of electrons to be transferred up to the antibonding
orbital ([[sigma].sup.*]) of the proton donor .
The band theory of inorganic semiconductors that is, occurrence of valence and conduction bands in inorganic semiconductors translates to [pi] or bonding and [[pi].sup.*] or antibonding
bands in conducting polymers, respectively.
In Figures 7-10, the red shapes correspond to bonding molecular orbitals, while the green shapes correspond to antibonding
These electrons could be delocalized onto antibonding
or non-Lewis type (Rydberg) molecular orbitals .
[n.sub.B] designates the lone pair of the B proton acceptor, and [[sigma].sup.*.sub.A-H] is an antibonding
orbital of the A-H bond.
This was a result of lone pairs of electrons on the heteroatoms connected with double bonds being transferred to the [pi]* antibonding
orbital and indicated that double-bond heteroatoms were all oxidized during ozonation.
More specifically, molecules containing [pi]-electrons or nonbonding electrons (n-electrons) can absorb the energy in the form of ultraviolent or visible light to excite these electrons to higher antibonding
states ([pi]-NO) lie above the O2p band and two deep energy bonding states ([[pi].sup.*]-NO) lie below the O2p states.
If the lone pair electrons of the oxygen on the 2pyrrolidone are donated into the antibonding
molecular orbitais of the [C.sub.60] (Feng et al.
The electronic configuration of the oxygen diatom is [2[He.sup.4]]2[s.sup.4]2[p.sup.8] with the first ten electrons placed into the [sigma], [sigma]*, and [pi] orbitals and two unpaired electrons each located in a different [pi]* antibonding
bonding and antibonding
in LCAO and valence-bond theories," The Journal of Chemical Physics, vol.
Figure 1(a) depicts the UV-Vis spectrum of the ink, where absorption bands at 229 and 297 nm match with electronic transitions from nonbonding (lone-pair) n orbital to an antibonding
[pi] orbital (n-[pi]* transitions), typical of nitrate ions.