Optimization of parameters for semiempirical methods II. Applications

Journal of Computational Chemistry - Tập 10 Số 2 - Trang 221-264 - 1989
James J. P. Stewart1
1Frank J. Seiler Research Laboratory, United States Air Force Academy, Colorado Springs, Colorado 80840

Tóm tắt

AbstractMNDO/AM1‐type parameters for twelve elements have been optimized using a newly developed method for optimizing parameters for semiempirical methods. With the new method, MNDO‐PM3, the average difference between the predicted heats of formation and experimental values for 657 compounds is 7.8 kcal/mol, and for 106 hypervalent compounds, 13.6 kcal/mol. For MNDO the equivalent differences are 13.9 and 75.8 kcal/mol, while those for AM1, in which MNDO parameters are used for aluminum, phosphorus, and sulfur, are 12.7 and 83.1 kcal/mol, respectively. Average errors for ionization potentials, bond angles, and dipole moments are intermediate between those for MNDO and AM1, while errors in bond lengths are slightly reduced.

Từ khóa


Tài liệu tham khảo

10.1021/ja00457a004

10.1021/ja00839a002

10.1021/ja00299a024

Dewar M. J. S., 1987, J. Am. Chem. Soc., 100, 58, 10.1021/ja00469a010

Davis L. P., 1981, J. Comput. Chem., 4, 443

10.1021/om00133a029

10.1002/jcc.540070206

10.1002/jcc.540040207

10.1002/jcc.540040412

10.1002/jcc.540050413

M. J. S.DewarandE. G.Zoebisch J. Mol. Struct. Theochem. (in press).

10.1021/om00150a020

10.1002/9783527619825

Wagman D. D., 1982, The NBS Tables of Chemical Thermodynamic Properties

Chase M. W., 1985, JANAF Thermochemical Tables

10.1021/ja00457a005

Stewart J. J. P., 1983, MOPAC, A Semi‐Empirical Molecular Orbital Program, QCPE, 455

10.1093/comjnl/6.2.163

10.1093/comjnl/10.4.406

10.1093/imamat/6.3.222

10.1093/comjnl/13.3.317

10.1090/S0025-5718-1970-0258249-6

10.1090/S0025-5718-1970-0274029-X

10.1016/0166-1280(86)80029-X

10.1038/198476a0

10.1063/1.1700148

10.1016/0022-1902(70)80154-3

Jug K., 1987, J. Comp. Chem., 9, 40, 10.1002/jcc.540090106

For example 6‐31G**with 2nd or 4th order Møoller‐Plesset corrections.

Weast R. C., 1980, CRC Handbook of Chemistry and Physics, F

10.1080/07370658708218544

Kebarle P., 1976, Environmental Effects on Molecular Structure and Properties, 81, 10.1007/978-94-010-1837-1_6

J. O.Morley J. Chem. Soc. Perkin Trans. II(in press).

10.1016/0022-2860(74)85039-8

10.1016/0009-2614(85)85236-2

10.1021/ja00839a005

10.1073/pnas.82.8.2225