4su 2pg 3sg 1pu 2su C 1sg C-C C 4su 2pg 3sg 1pu 2su C 1sg C-C C anti-bonding anti-bonding non-bonding non-bonding Two “lone pairs” but not equivalent! bonding Two “O-H bonds” bonding Mainly B 2p lcao’s Note p bonds! Mainly B 2s-F 2p lcao’s Mainly F 2s lcao’s.
Download ReportTranscript 4su 2pg 3sg 1pu 2su C 1sg C-C C 4su 2pg 3sg 1pu 2su C 1sg C-C C anti-bonding anti-bonding non-bonding non-bonding Two “lone pairs” but not equivalent! bonding Two “O-H bonds” bonding Mainly B 2p lcao’s Note p bonds! Mainly B 2s-F 2p lcao’s Mainly F 2s lcao’s.
4su 2pg 3sg 1pu 2su C 1sg C-C C 4su 2pg 3sg 1pu 2su C 1sg C-C C anti-bonding anti-bonding non-bonding non-bonding Two “lone pairs” but not equivalent! bonding Two “O-H bonds” bonding Mainly B 2p lcao’s Note p bonds! Mainly B 2s-F 2p lcao’s Mainly F 2s lcao’s L a.o.’s M a.o.’s ML4 - D4h L a.o.’s M a.o.’s ML4 - D4h a1 z F g t1u eg 3d t2g S F F eg t2g x F 3p t1u 3s a1g eg t1u a1g eg .F Oh S valence orbitals (9) y F F t1u F donor (sp) orbitals (6) a1g SF6 Instead of; . F 2p Because harder to draw a1 g t1u 3d eg eg t2g t2g 3p t1u 3s a1 g eg t1u a1 eg g Bonding MO’s 8 e- gives 4 bonds! Oh t1u a1 g SF6 . F a1 F g F F t1u S F F F Two views: A) 4 bonds distributed over six S-F pairs B) 4 bonds (covalent ) + 2 “bonds” ionic (S6+-F-) 3p t1u 3s a1 g eg t1u a1 eg g t1u a1 g SF6 3s Na I Br (-12.5 eV) Cl (-13.7 eV) F- F (-18.6 eV) 4p t1u 4s a1 g eg 3d t2g eg t1u a1 3rd row M, Valence Atomic orbitals g Oh ML6 :L 6s-donors s ONLY, Like H or NH3 Symmetry Adapted Group Orbitals for 6 s-donors t1u a1 g eg 4p t1u 4s a1 g eg 3d t2g t2g eg t1u a1 3rd row M, Valence Atomic orbitals g eg Oh t1u a1 g ML6 :L 6s-donors s ONLY, Like H or NH3 t1u a1 M-L s anti-bonding MO’s g eg 4p t1u 4s a1 g eg 3d t2g 3rd row M, Valence Atomic orbitals M-L s bonding MO’s t2g eg t1u a1 eg g Oh t1u a1 g ML6 :L 6s-donors s ONLY, Like H or NH3 t1u a1 M-L s anti-bonding MO’s g eg 4p t1u What is Do? 4s a1 g eg 3d t2g 3rd row M, Valence Atomic orbitals M-L s bonding MO’s t2g eg t1u a1 eg g Oh t1u a1 g ML6 :L 6s-donors s ONLY, Like H or NH3 Symmetry Adapted Group Orbitals for 6 p-donors t1u a1 M-L s anti-bonding MO’s g eg 4p t1u 4s a1 g eg 3d t2g 3rd row M, Valence Atomic orbitals M-L s bonding MO’s t2g eg t1u a1 g t2g t2u t1g t1u 12 L p orbitals eg t1u a1 g Oh :L 6s p-donors Like Cl- .. L t1u a1 M-L s anti-bonding MO’s g eg 4p t1u 4s a1 Effect on Do? t2g g eg 3d t2g 3rd row M, Valence Atomic orbitals M-L s bonding MO’s t2g eg t1u a1 g t2g t2u t1g t1u 12 L p orbitals eg t1u a1 g Oh :L 6s p-donors Like Cl- t1u a1 M-L s anti-bonding MO’s g eg 4p t1u CO t2g 4s a1 t2g t2u t1g t1u 12 L p orbitals g eg 3d t2g t2g 3rd row M, Valence Atomic orbitals M-L s bonding MO’s t2g t2u t1g t1u 12 L p orbitals eg t1u a1 eg g Oh t1u :L 6s p-acceptors Like CO, CN- a1 g ML6 eg eg eg t2g Do Do t2g t2g eg eg t2g t2g 3d eg t2g t2g 3d t2g t2g Case 1. L is p innocent (sigma donor only) Do Case 2. L is p base (sigma donor and p donor) 3d t2g 12 L p orbitals Case 3. L is p acid (sigma donor and p acceptor) 12 L p orbitals