S4S4 C3C3 S6S6. p z, (d xz, d yz ) s A’ 1 (p x, p y ): E’ p z : Aâ€‌ 2 (d x2 – y2, d xy ): E’ (d xz, d yz ): E’’ d z2 : A’ 1

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Text of S4S4 C3C3 S6S6. p z, (d xz, d yz ) s A’ 1 (p x, p y ): E’ p z...

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  • S4S4 C3C3 S6S6
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  • p z, (d xz, d yz ) s A 1 (p x, p y ): E p z : A 2 (d x2 y2, d xy ): E (d xz, d yz ): E d z2 : A 1
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  • 30 -3 01
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  • f) Now shift to the C 3v point group and obtain the irreducible reps to which the pi bonding NH 2 unit orbitals belong. E2C 3 3v 301 = A 1 + E
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  • A1A1 E1E1 E2E2
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  • A1A1 E1E1 E2E2 On going from C 3v to D 3h maintain same behavior for the C 3v operations (E, C 3 and v ). Thus A 1 in C 3v could be either A 1 or A 2. Choose A 2 since it is antisym for h. Likewise, E could be either E or E Choose E since it is antisym for h. Thus A 2 and E
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  • A2A2 E (1) E (2) Si Orbitals s A 1 (p x, p y ): E P z : A 2 (x 2 y 2, xy): E (xz, yz): E z 2 : A 1 i) Show bonding between the Si orbitals and the symmetry adapted NH 2 orbitals
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  • i x,z E C 2 (y) x,z i = C 2 (y)
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  • i E C 2 (y) C 2 (-xy) xy,z C 2 (-xy)
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  • x,z E C 2 (y) C 4 (z) xy,z C 2 (-xy) C 4 (z)C 2 (z)
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  • E C 2 (y) xy,z C 2 (-xy) C 4 (z)C 2 (z) xy,z
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  • E C 2 (y) C 2 (-xy) C 4 (z) C 2 (z) hh xy,z hh C 2 (-xy) D 4h
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  • Coordination number 1 Very rare, bulky ligands, linear structures, no possible isomers
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  • Coordination number 2 Also rare, typical of d 10, linear structures, no possible isomers
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  • Coordination number 3 Also typical of d 10, trigonal planar structures (rarely T-shaped), no possible isomers
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  • Coordination number 4 Tetrahedral (2 enantiomers if all ligands different) Square planar (2 geometrical isomer for two types of ligands) typical of d 8 Very common
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  • Tetrahedral Square planar
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  • Coordination number 5 Trigonal bipyramidal (tbp)Square-based pyramidal sbp) Very similar energies, they may easily interconvert in solution (fluxionality)
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  • Coordination number 6 Octahedral most common Trigonal prism less common
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  • Some possible isomers in octahedral complexes cis-MA 2 B 4 trans-MA 2 B 4 fac-MA 3 B 3 mer-MA 3 B 3
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  • Some examples of trigonal prismatic structures
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  • Coordination number 7 Pentagonal bipyramidal Capped octahedral Capped trigonal prismatic
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  • Examples of coordination number 7

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