38 Nuclear Stability

38 Nuclear Stability - MO Energy Levels for Octahedral...

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1 1 MO Energy Levels for Octahedral Complex Ions E n e r g y e g t 2g sp 3 d 2 metal – sp n ligand bonding orbitals sp 3 d 2 metal – sp n ligand antibonding orbitals 3d metal nonbonding orbitals d-orbital splitting crystal field splitting ligand field splitting d-electrons from the metal 6 pairs of electrons from the 6 ligands High spin Low spin Color 2 Consider the complex ions: hexa-amineiron(II) and hexa-aminecobalt(III). One is low spin (smaller paramagnetism), and one is high spin (larger paramagnetism), which is low spin? A) Fe 2+ is low spin B) Co 3+ is low spin Note: The 2 factors that affect the d-orbital splitting, are the ligand and the charge on the metal. Large = d-orbital splitting because +3 charge draws ligand closer than +2 charge
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2 3 Consider the complex ions: hexa-amineiron(II) and hexa-aminecobalt(III). Which one absorbs the shorter wavelength (higher energy) light? A) Co 3+ absorbs shorter wavelength, higher energy light B) Fe 2+ absorbs shorter wavelength, higher energy light We just decided that the cobalt complex has low spin and large and the iron complex has high spin and small ( = d-orbital splitting). 4 Revised Schedule Wed, Lec 38: Nuclear Stability MSJ 20.1 – 20.3 MSJ 20.2, 20.5 – 20.8, 21.1 Mon, Lec 40: Radioactive Decay MSJ 20.4, 20.9 Wed, Lec 41: Review for Final Exam Skip Chapter 21, except 21.1 Fri, Lec 42: Review for Final Exam No clicker points for review lectures.
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3 5 CHE 132 Final Exam Monday, May 18, 11:00 AM – 1:30 PM Rooms TBA Exam inventory for Part 4 will be posted soon Maybe by Monday Final exams will be added to exam library Maybe by Monday Covers all course material 35 multiple choice questions
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38 Nuclear Stability - MO Energy Levels for Octahedral...

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