Friday, January 30, 2009

chema1 40 molecular orbitals

MO diagram
molecular absorption bands, not lines.  due to nucleus vibrating.
$\sigma_{1S}$ bonding orbital
$\sigma^*_{1S}$ antibonding orbital
Bond order = $\frac{#bonding-electrons - #antibonding-e.}{2}$ > 0 if stable
unpaired electrons ... attracted to magnet O2 Yes(paramagnetic) N2|F2 No(diamagnetic) & "lewis dot structure" cannot predict this.
2p + 2p -> $\sigma_{2P}$ + $\sigma^*_{2P}$ + $\pi_{2P}$ + $\pi^*_{2P}$
pオービタルからパイだけでなくシグマもできるView


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