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ConsistentForceField

Guides

  • ConsistentForceField

Tech Notes

  • Extending Coverage of the CFF

Symbols

  • CFFAngle
  • CFFAtomCoordinates
  • CFFDihedral
  • CFFDistance
  • CFFEnergyComponents
  • CFFEnergy
  • CFFEnergyReport
  • CFFGradient
  • CFFHessian
  • CFFNormalModes
  • CFFOptimizeGeometry
  • CFFParameterize
  • CFFThermodynamicFunctions
  • CFFThreeFoldTorsion
  • CFFTorsion
  • CFFTwist
  • CFFTwoFoldTorsion
  • NormalModeTable
  • $AllowSymbolicCFFEnergy
  • $CFFAuxiliaryPatternsParameters
  • $CFFPublishedPatternsParameters
  • $ConsistentForceFieldVersion
RobertNachbar`ConsistentForceField`
CFFThreeFoldTorsion
​
CFFThreeFoldTorsion
[mol,{i,j,k,{
l
1
,
l
2
,
l
3
}}]
returns the 3-fold torsional symmetry coordinate in degrees subtended by the atoms
i
,
j
,
k
, and
{
l
1
,
l
2
,
l
3
}
in
Molecule
mol
as a
Quantity
.
​
​
CFFThreeFoldTorsion
[mol,{{i,j,k,{
l
1
,
l
2
,
l
3
}},…}]
returns several torsional 3-fold torsional symmetry coordinates.
​
​
CFFThreeFoldTorsion
[atoms]
can be used in
StepMonitor
or
EvaluationMonitor
to return the 3-fold torsional symmetry coordinate(s) subtended by tuples of atoms during optimization with
CFFOptimizeGeometry
.
​
Details and Options

Examples  
(2)
Basic Examples  
(1)
Make the molecule di-t-butylmethane:
In[1]:=
dtbm=Molecule["C(C(C)(C)C)C(C)(C)C"]//MoleculeModify[#,"ComputeAtomCoordinates"]&;​​MoleculePlot3D[%]
Out[1]=
Contents cannot be rendered at this time; please try again later or download this notebook for full functionality »
Compute a 3-fold torsional symmetry coordinate:
In[2]:=
CFFThreeFoldTorsion
[dtbm,{6,1,2,{3,4,5}}]
Out[2]=
-166.967
°
Compute the torsion angle 6–1–2–3 to see the difference:
In[3]:=
CFFTorsion
[dtbm,{6,1,2,3}]
Out[3]=
-167.6
°
Scope  
(1)

SeeAlso
CFFDistance
 
▪
CFFAngle
 
▪
CFFTorsion
 
▪
CFFTwist
 
▪
CFFDihedral
 
▪
CFFTwoFoldTorsion
 
▪
MoleculeValue
RelatedGuides
▪
ConsistentForceField
""

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