整 VSEPR 子。 Reading:Gray:(4-5) OGC:(3.9)
VSEPR Reading: Gray: (4-5) OGC: (3.9) VIII-1
Bonding in Complex Molecules Taxol NL 9 VIll-2
Bonding in Complex Molecules Taxol VIII-2
Valence Shell Electron Pair Repulsion Theory (VSEPR) Predicts the shapes of molecules o Works very well for octets and for "expanded octets"(2nd and 3rd row elements) Doesn't work at all for transition metal complexes--too many groups and electrons to allow the use of sterics alone VIll-3
Valence Shell Electron Pair Repulsion Theory (VSEPR) • Predicts the shapes of molecules • Works very well for octets and for “expanded octets” (2nd and 3rd row elements) • Doesn’t work at all for transition metal complexes--too many groups and electrons to allow the use of sterics alone VIII-3
Valence Shell Electron Pair Repulsion Theory (VSEPR) Ron Gillespie Sir Ronald Nyholm McMaster College,Canada University College 1957 London,1957 VIll-4
Ron Gillespie McMaster College, Canada 1957 Sir Ronald Nyholm University College London, 1957 Valence Shell Electron Pair Repulsion Theory (VSEPR) VIII-4
Rules of VSEPR Theory 1)Draw the best Lewis dot structure of the molecule 2)Assign a steric number(SN)to the structure SN =(of bonded atoms)+(of lone pairs) 3)Place the atoms and lone pairs as far apart as possible (while still keeping them connected to the central atom) 4)Deduce the molecular geometry by ignoring the positions of the lone pairs 5)Remember,lone pairs are FAT VIll-5
Rules of VSEPR Theory 1) Draw the best Lewis dot structure of the molecule 2) Assign a steric number (SN) to the structure SN = (# of bonded atoms) + (# of lone pairs) 3) Place the atoms and lone pairs as far apart as possible (while still keeping them connected to the central atom) 4) Deduce the molecular geometry by ignoring the positions of the lone pairs 5) Remember, lone pairs are FAT VIII-5