03-28-2011 Lecture

03-28-2011 Lecture - Heteronuclear Diatomics Intro = CA2(A...

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Energy Heteronuclear Diatomics, Intro Ψ * = C A2 Φ (A) – C B2 Φ (B) AO with lower energy belongs to more electronegative atom, B. Has larger coefficient for bonding orbital, Ψ . Energy stabilization decreases as the energies of Φ (A) and Φ (B) diverge, however homonuclear bonds not necessarily stronger than heteronuclear— other effects come into play. Φ (A) Φ (B) (more electronegative atom) Ψ = C A1 Φ (A) + C B1 Φ (B) |C A2 | 2 > |C B2 | 2 |C B1 | 2 > |C A1 | 2 For example, - :C O: + is 1070 kJ/mol and :N N: is 945 kJ/mol
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Energy N O 2s 2s 2p 2p σ 2s σ * 2s σ 2p σ * 2p π 2p π * 2p •NO has 11 electrons and is a radical (1 unpaired electron) Heteronuclear Diatomics, Example NO • Because it has an unpaired electron, NO is paramagnetic
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