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Computational Chemistry Using An PC
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Computational Chemistry Using the PC Third Edition Donald W. Rogers http://u.115.com/file/f2bb767b8f#Download Computational_Chemistry_Using_An_PC.pdf Published by John Wiley & Sons, Inc., Hoboken, New Jersey. Published simultaneously in Canada. Preface to the Third Edition xv Preface to the Second Edition xvii Preface to the First Edition xix Chapter 1. Iterative Methods 1 Iterative Methods 1 An Iterative Algorithm 2 Blackbody Radiation 2 Radiation Density 3 Wien’s Law 4 The Planck Radiation Law 4 COMPUTER PROJECT 1-1 j Wien’s Law 5 COMPUTER PROJECT 1-2 j Roots of the Secular Determinant 6 The Newton–Raphson Method 7 Problems 9 Numerical Integration 9 Simpson’s Rule 10 vii Efficiency and Machine Considerations 13 Elements of Single-Variable Statistics 14 The Gaussian Distribution 15 COMPUTER PROJECT 1-3 j Medical Statistics 17 Molecular Speeds 19 COMPUTER PROJECT 1-4 j Maxwell–Boltzmann Distribution Laws 20 COMPUTER PROJECT 1-5 j Elementary Quantum Mechanics 23 COMPUTER PROJECT 1-6 j Numerical Integration of Experimental Data Sets 24 Problems 29 Chapter 2. Applications of Matrix Algebra 31 Matrix Addition 31 Matrix Multiplication 33 Division of Matrices 34 Powers and Roots of Matrices 35 Matrix Polynomials 36 The Least Equation 37 Importance of Rank 38 Importance of the Least Equation 38 Special Matrices 39 The Transformation Matrix 41 Complex Matrices 42 What’s Going On Here? 42 Problems 44 Linear Nonhomogeneous Simultaneous Equations 45 Algorithms 47 Matrix Inversion and Diagonalization 51 COMPUTER PROJECT 2-1 j Simultaneous Spectrophotometric Analysis 52 COMPUTER PROJECT 2-2 j Gauss–Seidel Iteration: Mass Spectroscopy 54 COMPUTER PROJECT 2-3 j Bond Enthalpies of Hydrocarbons 56 Problems 57 Chapter 3. Curve Fitting 59 Information Loss 60 The Method of Least Squares 60 viii CONTENTS Least Squares Minimization 61 Linear Functions Passing Through the Origin 62 Linear Functions Not Passing Through the Origin 63 Quadratic Functions 65 Polynomials of Higher Degree 68 Statistical Criteria for Curve Fitting 69 Reliability of Fitted Parameters 70 COMPUTER PROJECT 3-1 j Linear Curve Fitting: KF Solvation 73 COMPUTER PROJECT 3-2 j The Boltzmann Constant 74 COMPUTER PROJECT 3-3 j The Ionization Energy of Hydrogen 76 Reliability of Fitted Polynomial Parameters 76 COMPUTER PROJECT 3-4 j The Partial Molal Volume of ZnCl2 77 Problems 79 Multivariate Least Squares Analysis 80 Error Analysis 86 COMPUTER PROJECT 3-5 j Calibration Surfaces Not Passing Through the Origin 88 COMPUTER PROJECT 3-6 j Bond Energies of Hydrocarbons 89 COMPUTER PROJECT 3-7 j Expanding the Basis Set 90 Problems 90 Chapter 4. Molecular Mechanics: Basic Theory 93 The Harmonic Oscillator 93 The Two-Mass Problem 95 Polyatomic Molecules 97 Molecular Mechanics 98 Ethylene: A Trial Run 100 The Geo File 102 The Output File 103 TINKER 108 COMPUTER PROJECT 4-1 j The Geometry of Small Molecules 110 The GUI Interface 112 Parameterization 113 The Energy Equation 114 Sums in the Energy Equation: Modes of Motion 115 COMPUTER PROJECT 4-2 j The MM3 Parameter Set 117 CONTENTS ix COMPUTER PROJECT 4-3 j The Butane Conformational Mix 125 Cross Terms 128 Problems 129 Chapter 5. Molecular Mechanics II: Applications 131 Coupling 131 Normal Coordinates 136 Normal Modes of Motion 136 An Introduction to Matrix Formalism for Two Masses 138 The Hessian Matrix 140 Why So Much Fuss About Coupling? 143 The Enthalpy of Formation 144 Enthalpy of Reaction 147 COMPUTER PROJECT 5-1 j The Enthalpy of Isomerization of cis- and trans-2-Butene 148 Enthalpy of Reaction at Temperatures 6¼ 298 K 150 Population Energy Increments 151 Torsional Modes of Motion 153 COMPUTER PROJECT 5-2 j The Heat of Hydrogenation of Ethylene 154 Pi Electron Calculations 155 COMPUTER PROJECT 5-3 j The Resonance Energy of Benzene 157 Strain Energy 158 False Minima 158 Dihedral Driver 160 Full Statistical Method 161 Entropy and Heat Capacity 162 Free Energy and Equilibrium 163 COMPUTER PROJECT 5-4 j More Complicated Systems 164 Problems 166 Chapter 6. Huckel Molecular Orbital Theory I: Eigenvalues 169 Exact Solutions of the Schroedinger Equation 170 Approximate Solutions 172 The Huckel Method 176 The Expectation Value of the Energy: The Variational Method 178 COMPUTER PROJECT 6-1 j Another Variational Treatment of the Hydrogen Atom 181 x CONTENTS Huckel Theory and the LCAO Approximation 183 Homogeneous Simultaneous Equations 185 The Secular Matrix 186 Finding Eigenvalues by Diagonalization 187 Rotation Matrices 188 Generalization 189 The Jacobi Method 191 Programs QMOBAS and TMOBAS 194 COMPUTER PROJECT 6-2 j Energy Levels (Eigenvalues) 195 COMPUTER PROJECT 6-3 j Huckel MO Calculations of Spectroscopic Transitions 197 Problems 198 Chapter 7. Huckel Molecular Orbital Theory II: Eigenvectors 201 Recapitulation and Generalization 201 The Matrix as Operator 207 The Huckel Coefficient Matrix 207 Chemical Application: Charge Density 211 Chemical Application: Dipole Moments 213 Chemical Application: Bond Orders 214 Chemical Application: Delocalization Energy 215 Chemical Application: The Free Valency Index 217 Chemical Application: Resonance (Stabilization) Energies 217 LIBRARY PROJECT 7-1 j The History of Resonance and Aromaticity 219 Extended Huckel Theory—Wheland’s Method 219 Extended Huckel Theory—Hoffman’s EHT Method 221 The Programs 223 COMPUTER PROJECT 7-1 j Larger Molecules: Calculations using SHMO 225 COMPUTER PROJECT 7-2 j Dipole Moments 226 COMPUTER PROJECT 7-3 j Conservation of Orbital Symmetry 227 COMPUTER PROJECT 7-4 j Pyridine 228 Problems 229 Chapter 8. Self-Consistent Fields 231 Beyond Huckel Theory 231 Elements of the Secular Matrix 232 CONTENTS xi The Helium Atom 235 A Self-Consistent Field Variational Calculation of IP for the Helium Atom 236 COMPUTER PROJECT 8-1 j The SCF Energies of First Row Atoms and Ions 240 COMPUTER PROJECT 8-2 j A High-Level ab initio Calculation of SCF First IPs of the First Row Atoms 241 The STO-xG Basis Set 242 The Hydrogen Atom: An STO-1G ‘‘Basis Set’’ 243 Semiempirical Methods 248 PPP Self-Consistent Field Calculations 248 The PPP-SCF Method 249 Ethylene 252 Spinorbitals, Slater Determinants, and Configuration Interaction 255 The Programs 256 COMPUTER PROJECT 8-3 j SCF Calculations of Ultraviolet Spectral Peaks 256 COMPUTER PROJECT 8-4 j SCF Dipole Moments 258 Problems 259 Chapter 9. Semiempirical Calculations on Larger Molecules 263 The Hartree Equation 263 Exchange Symmetry 266 Electron Spin 267 Slater Determinants 269 The Hartree–Fock Equation 273 The Fock Equation 276 The Roothaan–Hall Equations 278 The Semiempirical Model and Its Approximations: MNDO, AM1, and PM3 279 The Programs 283 COMPUTER PROJECT 9-1 j Semiempirical Calculations on Small Molecules: HF to HI 284 COMPUTER PROJECT 9-2 j Vibration of the Nitrogen Molecule 284 Normal Coordinates 285 Dipole Moments 289 COMPUTER PROJECT 9-3 j Dipole Moments (Again) 289 Energies of Larger Molecules 289 xii CONTENTS COMPUTER PROJECT 9-4 j Large Molecules: Carcinogenesis 291 Problems 293 Chapter 10. Ab Initio Molecular Orbital Calculations 299 The GAUSSIAN Implementation 299 How Do We Determine Molecular Energies? 301 Why Is the Calculated Energy Wrong? 306 Can the Basis Set Be Further Improved? 306 Hydrogen 308 Gaussian Basis Sets 309 COMPUTER PROJECT 10-1 j Gaussian Basis Sets: The HF Limit 311 Electron Correlation 312 G2 and G3 313 Energies of Atomization and Ionization 315 COMPUTER PROJECT 10-2 j Larger Molecules: G2, G2(MP2), G3, and G3(MP2) 316 The GAMESS Implementation 317 COMPUTER PROJECT 10-3 j The Bonding Energy Curve of H2: GAMESS 318 The Thermodynamic Functions 319 Koopmans’s Theorem and Photoelectron Spectra 323 Larger Molecules I: Isodesmic Reactions 324 COMPUTER PROJECT 10-4 j Dewar Benzene 326 Larger Molecules II: Density Functional Theory 327 COMPUTER PROJECT 10-5 j Cubane 330 Problems 330 Bibliography 333 Appendix A. Software Sources 339 Index 343 |
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