/// <summary>
/// Constructor for the Electronegativity object.
/// </summary>
/// <param name="maxIterations">The maximal number of Iteration</param>
/// <param name="maxResonStruc">The maximal number of Resonance Structures</param>
public PiElectronegativity(int maxIterations, int maxResonStruc)
{
peoe = new GasteigerMarsiliPartialCharges();
pepe = new GasteigerPEPEPartialCharges();
MaxIterations = maxIterations;
MaxResonanceStructures = maxResonStruc;
}
public void TestSetStepSize()
{
GasteigerMarsiliPartialCharges peoe = new GasteigerMarsiliPartialCharges();
int StepSize = 22;
peoe.StepSize = StepSize;
Assert.AreEqual(StepSize, peoe.StepSize);
}
public void TestSetChiCatHydrogen_Double()
{
GasteigerMarsiliPartialCharges peoe = new GasteigerMarsiliPartialCharges();
double DEOC_HYDROGEN = 22;
peoe.ChiCatHydrogen = DEOC_HYDROGEN;
Assert.AreEqual(DEOC_HYDROGEN, peoe.ChiCatHydrogen, 0.01);
}
public void TestSetMaxGasteigerDamp_Double()
{
GasteigerMarsiliPartialCharges peoe = new GasteigerMarsiliPartialCharges();
double MX_DAMP = 1;
peoe.MaxGasteigerDamp = MX_DAMP;
Assert.AreEqual(MX_DAMP, peoe.MaxGasteigerDamp, 0.01);
}
public void TestSetMaxGasteigerIters_Double()
{
GasteigerMarsiliPartialCharges peoe = new GasteigerMarsiliPartialCharges();
double MX_ITERATIONS = 10;
peoe.MaxGasteigerIterations = MX_ITERATIONS;
Assert.AreEqual(MX_ITERATIONS, peoe.MaxGasteigerIterations, 0.01);
}
/// <summary>
/// Calculate the electronegativity of orbitals pi.
/// </summary>
/// <param name="ac"></param>
/// <param name="atom">atom for which effective atom electronegativity should be calculated</param>
/// <param name="maxIterations">The maximal number of Iteration</param>
/// <param name="maxResonStruc">The maximal number of Resonance Structures</param>
/// <returns>Electronegativity of orbitals pi.</returns>
public double CalculatePiElectronegativity(IAtomContainer ac, IAtom atom, int maxIterations, int maxResonStruc)
{
MaxIterations = maxIterations;
MaxResonanceStructures = maxResonStruc;
double electronegativity = 0;
try
{
if (!ac.Equals(acOldP))
{
molPi = ac.Builder.NewAtomContainer(ac);
peoe = new GasteigerMarsiliPartialCharges();
peoe.AssignGasteigerMarsiliSigmaPartialCharges(molPi, true);
var iSet = ac.Builder.NewAtomContainerSet();
iSet.Add(molPi);
iSet.Add(molPi);
gasteigerFactors = pepe.AssignrPiMarsilliFactors(iSet);
acOldP = ac;
}
IAtom atomi = molPi.Atoms[ac.Atoms.IndexOf(atom)];
int atomPosition = molPi.Atoms.IndexOf(atomi);
int stepSize = pepe.StepSize;
int start = (stepSize * (atomPosition) + atomPosition);
double q = atomi.Charge.Value;
if (molPi.GetConnectedLonePairs(molPi.Atoms[atomPosition]).Any() ||
molPi.GetMaximumBondOrder(atomi) != BondOrder.Single || atomi.FormalCharge != 0)
{
return((gasteigerFactors[1][start]) + (q * gasteigerFactors[1][start + 1]) + (gasteigerFactors[1][start + 2] * (q * q)));
}
}
catch (Exception e)
{
Trace.TraceError(e.StackTrace);
}
return(electronegativity);
}
public void TestAssignGasteigerSigmaMarsiliFactors_IAtomContainer()
{
GasteigerMarsiliPartialCharges peoe = new GasteigerMarsiliPartialCharges();
IAtomContainer molecule = builder.NewAtomContainer();
molecule.Atoms.Add(builder.NewAtom("C"));
molecule.Atoms[0].Charge = 0.0;
molecule.Atoms.Add(builder.NewAtom("F"));
molecule.Atoms[1].Charge = 0.0;
molecule.AddBond(molecule.Atoms[0], molecule.Atoms[1], BondOrder.Single);
AddExplicitHydrogens(molecule);
AtomContainerManipulator.PercieveAtomTypesAndConfigureAtoms(molecule);
CDK.LonePairElectronChecker.Saturate(molecule);
foreach (var atom in molecule.Atoms)
{
atom.Charge = 0.0;
}
Assert.IsNotNull(peoe.AssignGasteigerSigmaMarsiliFactors(molecule).Length);
}
public void TestCalculateCharges_IAtomContainer()
{
double[] testResult = { 0.07915, -0.25264, 0.05783, 0.05783, 0.05783 };
var peoe = new GasteigerMarsiliPartialCharges();
var molecule = builder.NewAtomContainer();
molecule.Atoms.Add(builder.NewAtom("C"));
molecule.Atoms.Add(builder.NewAtom("F"));
molecule.AddBond(molecule.Atoms[0], molecule.Atoms[1], BondOrder.Single);
AddExplicitHydrogens(molecule);
AtomContainerManipulator.PercieveAtomTypesAndConfigureAtoms(molecule);
CDK.LonePairElectronChecker.Saturate(molecule);
peoe.CalculateCharges(molecule);
for (int i = 0; i < molecule.Atoms.Count; i++)
{
Assert.AreEqual(testResult[i], molecule.Atoms[i].Charge.Value, 0.01);
}
}
public void TestAssignGasteigerMarsiliSigmaPartialCharges_IAtomContainer_Boolean()
{
double[] testResult = { 0.07915, -0.25264, 0.05783, 0.05783, 0.05783 };
GasteigerMarsiliPartialCharges peoe = new GasteigerMarsiliPartialCharges();
IAtomContainer molecule = builder.NewAtomContainer();
molecule.Atoms.Add(builder.NewAtom("C"));
molecule.Atoms.Add(builder.NewAtom("F"));
molecule.AddBond(molecule.Atoms[0], molecule.Atoms[1], BondOrder.Single);
AddExplicitHydrogens(molecule);
AtomContainerManipulator.PercieveAtomTypesAndConfigureAtoms(molecule);
CDK.LonePairElectronChecker.Saturate(molecule);
peoe.AssignGasteigerMarsiliSigmaPartialCharges(molecule, true);
for (int i = 0; i < molecule.Atoms.Count; i++)
{
//Debug.WriteLine("Charge for atom:"+i+" S:"+mol.GetAtomAt(i).Symbol+" Charge:"+mol.GetAtomAt(i).Charge);
Assert.AreEqual(testResult[i], molecule.Atoms[i].Charge.Value, 0.01);
}
}
public void TestUndefinedPartialCharge()
{
var filename = "NCDK.Data.MDL.burden_undefined.sdf";
var ins = ResourceLoader.GetAsStream(filename);
var reader = new MDLV2000Reader(ins);
var content = reader.Read(builder.NewChemFile());
reader.Close();
var cList = ChemFileManipulator.GetAllAtomContainers(content);
var ac = cList.First();
Assert.IsNotNull(ac);
AddExplicitHydrogens(ac);
AtomContainerManipulator.PercieveAtomTypesAndConfigureAtoms(ac);
Aromaticity.CDKLegacy.Apply(ac);
AddExplicitHydrogens(ac);
AtomContainerManipulator.PercieveAtomTypesAndConfigureAtoms(ac);
CDK.LonePairElectronChecker.Saturate(ac);
var peoe = new GasteigerMarsiliPartialCharges();
peoe.CalculateCharges(ac);
}
public void TestGetStepSize()
{
GasteigerMarsiliPartialCharges peoe = new GasteigerMarsiliPartialCharges();
Assert.AreEqual(5, peoe.StepSize);
}
public void TestGetChiCatHydrogen()
{
GasteigerMarsiliPartialCharges peoe = new GasteigerMarsiliPartialCharges();
Assert.AreEqual(20, peoe.MaxGasteigerIterations, 0.01);
}
/// <summary>
/// Main method which assigns Gasteiger partial pi charges.
/// </summary>
/// <param name="ac">AtomContainer</param>
/// <param name="setCharge">currently unused</param>
/// <returns>AtomContainer with partial charges</returns>
public IAtomContainer AssignGasteigerPiPartialCharges(IAtomContainer ac, bool setCharge)
{
// we save the aromaticity flags for the input molecule so that
// we can add them back before we return
var oldBondAromaticity = new bool[ac.Bonds.Count];
var oldAtomAromaticity = new bool[ac.Atoms.Count];
for (int i = 0; i < ac.Atoms.Count; i++)
{
oldAtomAromaticity[i] = ac.Atoms[i].IsAromatic;
}
for (int i = 0; i < ac.Bonds.Count; i++)
{
oldBondAromaticity[i] = ac.Bonds[i].IsAromatic;
}
/* 0: remove charge, and possible flag ac */
for (int j = 0; j < ac.Atoms.Count; j++)
{
ac.Atoms[j].Charge = 0.0;
ac.Atoms[j].IsPlaced = false;
}
for (int j = 0; j < ac.Bonds.Count; j++)
{
ac.Bonds[j].IsPlaced = false;
}
/* 1: detect resonance structure */
var gR1 = new StructureResonanceGenerator(); // according G. should be integrated the breaking bonding
var reactionList1 = gR1.Reactions.ToList();
var paramList1 = new List <IParameterReaction>();
var param = new SetReactionCenter {
IsSetParameter = true
};
paramList1.Add(param);
var reactionHCPB = new HeterolyticCleavagePBReaction {
ParameterList = paramList1
};
reactionList1.Add(new SharingAnionReaction());
foreach (var reaction in reactionList1)
{
reaction.ParameterList = paramList1;
}
gR1.Reactions = reactionList1;
// according G. should be integrated the breaking bonding
var gR2 = new StructureResonanceGenerator {
MaximalStructures = MaxResonanceStructures
};
var reactionList2 = gR2.Reactions.ToList();
var paramList = new List <IParameterReaction>();
var paramA = new SetReactionCenter {
IsSetParameter = true
};
paramList.Add(paramA);
reactionList2.Add(new HeterolyticCleavagePBReaction());
reactionList2.Add(new SharingAnionReaction());
foreach (var reaction in reactionList2)
{
reaction.ParameterList = paramList;
}
gR2.Reactions = reactionList2;
/* find resonance containers, which eliminates the repetitions */
StructureResonanceGenerator gRN = new StructureResonanceGenerator(); // according G. should be integrated the breaking bonding
var acSet = gRN.GetContainers(RemovingFlagsAromaticity(ac));
var iSet = ac.Builder.NewAtomContainerSet();
iSet.Add(ac);
if (acSet != null)
{
foreach (var container in acSet)
{
ac = SetFlags(container, ac, true);
// Aromatic don't break its double bond homolytically
if (Aromaticity.CDKLegacy.Apply(ac))
{
reactionList1.Remove(reactionHCPB);
}
else
{
reactionList1.Add(reactionHCPB);
}
var a = gR1.GetStructures(RemovingFlagsAromaticity(ac));
if (a.Count > 1)
{
for (int j = 1; j < a.Count; j++)
{ // the first is already added
iSet.Add(a[j]);
}
}
ac = SetFlags(container, ac, false);
/* processing for bonds which are not in resonance */
for (int number = 0; number < ac.Bonds.Count; number++)
{
IAtomContainer aa = SetAntiFlags(container, ac, number, true);
if (aa != null)
{
var ab = gR2.GetStructures(aa);
if (ab.Count > 1)
{
for (int j = 1; j < ab.Count; j++)
{ // the first is already added
iSet.Add(ab[j]);
}
}
ac = SetAntiFlags(container, aa, number, false);
}
}
}
}
/* detect hyperconjugation interactions */
var setHI = GetHyperconjugationInteractions(ac, iSet);
if (setHI != null)
{
if (setHI.Count != 0)
{
iSet.AddRange(setHI);
}
Debug.WriteLine($"setHI: {iSet.Count}");
}
if (iSet.Count < 2)
{
for (int i = 0; i < ac.Atoms.Count; i++)
{
ac.Atoms[i].IsAromatic = oldAtomAromaticity[i];
}
for (int i = 0; i < ac.Bonds.Count; i++)
{
ac.Bonds[i].IsAromatic = oldBondAromaticity[i];
}
return(ac);
}
/* 2: search whose atoms which don't keep their formal charge and set flags */
var sumCharges = Arrays.CreateJagged <double>(iSet.Count, ac.Atoms.Count);
for (int i = 1; i < iSet.Count; i++)
{
var iac = iSet[i];
for (int j = 0; j < iac.Atoms.Count; j++)
{
sumCharges[i][j] = iac.Atoms[j].FormalCharge.Value;
}
}
for (int i = 1; i < iSet.Count; i++)
{
var iac = iSet[i];
int count = 0;
for (int j = 0; j < ac.Atoms.Count; j++)
{
if (count < 2)
{
if (sumCharges[i][j] != ac.Atoms[j].FormalCharge)
{
ac.Atoms[j].IsPlaced = true;
iac.Atoms[j].IsPlaced = true;
count++; /* TODO- error */
}
}
}
}
/* 3: set sigma charge (PEOE). Initial start point */
var peoe = new GasteigerMarsiliPartialCharges();;
peoe.MaxGasteigerIterations = 6;
IAtomContainer acCloned;
var gasteigerFactors = AssignPiFactors(iSet);//a,b,c,deoc,chi,q
/* 4: calculate topological weight factors Wt=fQ*fB*fA */
var Wt = new double[iSet.Count - 1];
for (int i = 1; i < iSet.Count; i++)
{
Wt[i - 1] = GetTopologicalFactors(iSet[i], ac);
Debug.WriteLine($", W:{Wt[i - 1]}");
acCloned = (IAtomContainer)iSet[i].Clone();
acCloned = peoe.AssignGasteigerMarsiliSigmaPartialCharges(acCloned, true);
for (int j = 0; j < acCloned.Atoms.Count; j++)
{
if (iSet[i].Atoms[j].IsPlaced)
{
gasteigerFactors[i][StepSize * j + j + 5] = acCloned.Atoms[j].Charge.Value;
}
}
}
// calculate electronegativity for changed atoms and make the difference
// between whose atoms which change their formal charge
for (int iter = 0; iter < MaxGasteigerIterations; iter++)
{
for (int k = 1; k < iSet.Count; k++)
{
IAtomContainer iac = iSet[k];
double[] electronegativity = new double[2];
int count = 0;
int atom1 = 0;
int atom2 = 0;
for (int j = 0; j < iac.Atoms.Count; j++)
{
if (count == 2) // The change of sign is product of only two atoms, is not true
{
break;
}
if (iac.Atoms[j].IsPlaced)
{
Debug.WriteLine("Atom: " + j + ", S:" + iac.Atoms[j].Symbol + ", C:"
+ iac.Atoms[j].FormalCharge);
if (count == 0)
{
atom1 = j;
}
else
{
atom2 = j;
}
double q1 = gasteigerFactors[k][StepSize * j + j + 5];
electronegativity[count] =
gasteigerFactors[k][StepSize * j + j + 2] * q1 * q1
+ gasteigerFactors[k][StepSize * j + j + 1] * q1
+ gasteigerFactors[k][StepSize * j + j];
Debug.WriteLine("e:" + electronegativity[count] + ",q1: " + q1 + ", c:"
+ gasteigerFactors[k][StepSize * j + j + 2] + ", b:"
+ gasteigerFactors[k][StepSize * j + j + 1] + ", a:"
+ gasteigerFactors[k][StepSize * j + j]);
count++;
}
}
Debug.WriteLine("Atom1:" + atom1 + ",Atom2:" + atom2);
/* difference of electronegativity 1 lower */
var max1 = Math.Max(electronegativity[0], electronegativity[1]);
var min1 = Math.Min(electronegativity[0], electronegativity[1]);
double DX = 1.0;
if (electronegativity[0] < electronegativity[1])
{
DX = gasteigerFactors[k][StepSize * atom1 + atom1 + 3];
}
else
{
DX = gasteigerFactors[k][StepSize * atom2 + atom2 + 3];
}
var Dq = (max1 - min1) / DX;
Debug.WriteLine("Dq : " + Dq + " = (" + max1 + "-" + min1 + ")/" + DX);
var epN1 = GetElectrostaticPotentialN(iac, atom1, gasteigerFactors[k]);
var epN2 = GetElectrostaticPotentialN(iac, atom2, gasteigerFactors[k]);
var SumQN = Math.Abs(epN1 - epN2);
Debug.WriteLine("sum(" + SumQN + ") = (" + epN1 + ") - (" + epN2 + ")");
/* electronic weight */
var WE = Dq + fE * SumQN;
Debug.WriteLine("WE : " + WE + " = Dq(" + Dq + ")+FE(" + fE + ")*SumQN(" + SumQN);
var iTE = iter + 1;
/* total topological */
var W = WE * Wt[k - 1] * fS / (iTE);
Debug.WriteLine("W : " + W + " = WE(" + WE + ")*Wt(" + Wt[k - 1] + ")*FS(" + fS + ")/iter(" + iTE
+ "), atoms: " + atom1 + ", " + atom2);
/* iac == new structure, ac == old structure */
/* atom1 */
if (iac.Atoms[atom1].FormalCharge == 0)
{
if (ac.Atoms[atom1].FormalCharge < 0)
{
gasteigerFactors[k][StepSize * atom1 + atom1 + 5] = -1 * W;
}
else
{
gasteigerFactors[k][StepSize * atom1 + atom1 + 5] = W;
}
}
else if (iac.Atoms[atom1].FormalCharge > 0)
{
gasteigerFactors[k][StepSize * atom1 + atom1 + 5] = W;
}
else
{
gasteigerFactors[k][StepSize * atom1 + atom1 + 5] = -1 * W;
}
/* atom2 */
if (iac.Atoms[atom2].FormalCharge == 0)
{
if (ac.Atoms[atom2].FormalCharge < 0)
{
gasteigerFactors[k][StepSize * atom2 + atom2 + 5] = -1 * W;
}
else
{
gasteigerFactors[k][StepSize * atom2 + atom2 + 5] = W;
}
}
else if (iac.Atoms[atom2].FormalCharge > 0)
{
gasteigerFactors[k][StepSize * atom2 + atom2 + 5] = W;
}
else
{
gasteigerFactors[k][StepSize * atom2 + atom2 + 5] = -1 * W;
}
}
for (int k = 1; k < iSet.Count; k++)
{
for (int i = 0; i < ac.Atoms.Count; i++)
{
if (iSet[k].Atoms[i].IsPlaced)
{
var charge = ac.Atoms[i].Charge.Value;
double chargeT = 0.0;
chargeT = charge + gasteigerFactors[k][StepSize * i + i + 5];
Debug.WriteLine("i<|" + ac.Atoms[i].Symbol + ", " + chargeT + "=c:" + charge + "+g: "
+ gasteigerFactors[k][StepSize * i + i + 5]);
ac.Atoms[i].Charge = chargeT;
}
}
}
}// iterations
Debug.WriteLine("final");
// before getting back we should set back the aromatic flags
for (int i = 0; i < ac.Atoms.Count; i++)
{
ac.Atoms[i].IsAromatic = oldAtomAromaticity[i];
}
for (int i = 0; i < ac.Bonds.Count; i++)
{
ac.Bonds[i].IsAromatic = oldBondAromaticity[i];
}
return(ac);
}
public void TestGetMaxGasteigerDamp()
{
var peoe = new GasteigerMarsiliPartialCharges();
Assert.AreEqual(20, peoe.MaxGasteigerIterations, 0.01);
}
