Low symmetry groups
3600
CH2FCl
CHFClBr
• No symmetry
• Only identity (E)
Point group is “ C1
”
• Identity (E)
• A mirror plane (σ)
Point group is “ Cs ”
CH2Br2Cl2
• Identity (E)
• Inversion center (i)
Point group is “ Ci ”
Water
H2O
•
Symmetry elements inH2O
•
E, σxz, σyz, C2
• C2-axis (1800)
• Interchanges both the hydrogen
• The point group is “ C2v ”
• Vertical mirror palne, σv
• Reflecting both the hydrogens
• Vertical mirror palne, σv'
• Bisecting both the hydrogens and carbon
atom
C3v — ammonia
C3h — benzene-1,3,5triol
C∞v — hydrogen cyanide
C2 — hydrogen peroxide
C2h — 1,2difluoroethylene (trans)
D∞h — carbon dioxide
D2h — ethylene
D2h — diborane
D3h — boron trifluoride
D3d — ethane
(staggered)
D2d — allene
D6h — benzene
Td — methane
methanol
cyclopropane
NOCl
oxygen
quinoline
tartaric acid
thiocynate
trichloro ethane