關於部落格
radian 2πrad =360° 1πrad =180°
1°=π/180 rad(about 57.29578°)
  • 8561

    累積人氣

  • 10

    今日人氣

    0

    追蹤人氣

[網站連結]POINT GROUP

  1.  http://www.reciprocalnet.org/edumodules/symmetry/
  2. http://www.webqc.org/symmetry.php
  3. http://en.wikipedia.org/wiki/Point_group
  4. http://www.staff.ncl.ac.uk/j.p.goss/symmetry/
  5. http://www.cryst.ehu.es/rep/point.html
  6. http://www.ch.ic.ac.uk/vchemlab/symmetry/
  7. http://www.facstaff.bucknell.edu/kastner/xray2008/CountSymmetryElements/PointGroupSymmetry/PointGroupSymmetry.html

FROM 維基百科

Common point groups

The following table contains a list of point groups with representative molecules. The description of structure includes common shapes of molecules based on VSEPR theory.

Point groupSymmetry elementsSimple descriptionchiral if applicableIllustrative species
C1Eno symmetry, chiralCFClBrH, lysergic acid
CsE σhmirror plane, no other symmetrythionyl chloridehypochlorous acid
CiiInversion centeranti-1,2-dichloro-1,2-dibromoethane
C∞vE 2C σvlinearhydrogen chloridedicarbon monoxide
D∞hE 2C ∞σi i 2S ∞C2linear with inversion centerdihydrogenazide anion, carbon dioxide
C2E C2"open book geometry," chiralhydrogen peroxide
C3E C3propeller, chiraltriphenylphosphine
C2hE C2 i σhplanar with inversion centertrans-1,2-dichloroethylene
C3hE C3 C32 σh S3 S35propellerBoric acid
C2vE C2 σv(xz) σv'(yz)angular (H2O) or see-saw (SF4)watersulfur tetrafluoridesulfuryl fluoride
C3vE 2C3 3σvtrigonal pyramidalammoniaphosphorus oxychloride
C4vE 2C4 C2 2σv 2σdsquare pyramidalxenon oxytetrafluoride
D2E C2(x) C2(y) C2(z)twist, chiralcyclohexane twist conformation
D3E C3(z) 3C2triple helix, chiralTris(ethylenediamine)cobalt(III) cation
D2hE C2(z) C2(y) C2(x) i σ(xy) σ(xz) σ(yz)planar with inversion centerethylenedinitrogen tetroxidediborane
D3hE 2C3 3C2 σh 2S3 3σvtrigonal planar or trigonal bipyramidalboron trifluoridephosphorus pentachloride
D4hE 2C4 C2 2C2' 2C2 i 2S4 σh 2σv 2σdsquare planarxenon tetrafluoride
D5hE 2C5 2C52 5C2 σh 2S5 2S53 5σvpentagonalruthenoceneeclipsed ferrocene, C70 fullerene
D6hE 2C6 2C3 C2 3C2' 3C2 i 3S3 2S63 
σhd 3σv
hexagonalbenzenebis(benzene)chromium
D2dE 2S4 C2 2C2' 2σd90° twistallenetetrasulfur tetranitride
D3dE C3 3C2 i 2S6 3σd60° twistethane (staggered rotamer),
 cyclohexane chair conformation
D4dE 2S8 2C4 2S83 C2 4C2' 4σd45° twistdimanganese decacarbonyl 
(staggered rotamer)
D5dE 2C5 2C52 5C2 i 3S103 2S10 5σd36° twistferrocene (staggered rotamer)
TdE 8C3 3C2 6S4 6σdtetrahedralmethanephosphorus pentoxideadamantane
OhE 8C3 6C2 6C4 3C2 i 6S4 8S6 3σh 6σdoctahedral or cubic
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