oct 20 - energies: Fluorine IE = ~1800 kJ/mol Hydrogen IE =...

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1 Wed, 20 Oct 10 • Announcements – Material from today’s lecture will not appear on Exam 1, but it will appear on the final exam. • Lecture 9 – Bonding in heteronuclear diatomic molecules (14.4) MOs for Heteronuclear Diatomics • Two cases to consider: • CASE 1: Atoms of similar electronegativity – i.e., NO – Energies of the MOs are very similar to homonuclear cases: N 2 or O 2 . • CASE 2: Atoms of differing electronegativity – i.e., HF – Energies of the bonding MO is skewed towards the lower-energy F AOs
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2 MO Energy-Level Diagram for NO NO has 11 valence electrons. Use MO diagram for N 2 : Can we use the MO diagram for O 2 ? MO Energy-Level Diagram for HF • Experimentally, we know that the AOs on F are much lower energy than the AOs on H. Consider first ionization
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Unformatted text preview: energies: Fluorine IE = ~1800 kJ/mol Hydrogen IE = ~1300 kJ/mol Recall that IE is a measure of how tightly bound the electron is to the nucleus. Fluorines larger first IE means its easiest-to-remove 2p electron is still more tightly bound than hydrogens 1s electron. Therefore, we can assume that all of fluorines electrons are more tightly-bound than hydrogens 1s AO is. 3 MO Energy-Level Diagram for HF What does it mean for an electron to be more tightly-bound in F than in H? Two ways to think about it: This means the MOs we get from AO overlap in HF are more complicated than we get in NO. 4 MO Energy-Level Diagram for HF So, we have mixing between Hs 1s and Fs 2p x only....
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oct 20 - energies: Fluorine IE = ~1800 kJ/mol Hydrogen IE =...

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