A combined QM/MM study of ligand substitution enthalpies in the L2Fe(CO)3, RuCpL2Cl, and RuCp*L2Cl systems

被引：30

作者：

Cavallo, L

Woo, TK

Ziegler, T

机构：

[1] Univ Calgary, Dept Chem, Calgary, AB T2N 1N4, Canada

[2] Univ Naples Federico II, Dipartimento Chim, I-80134 Naples, Italy

来源：

CANADIAN JOURNAL OF CHEMISTRY-REVUE CANADIENNE DE CHIMIE | 1998年 / 76卷 / 10期

关键词：

combined QM/MM; ligand substitutions; organometallic complexes;

D O I：

10.1139/cjc-76-10-1457

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

A combined density functional and molecular mechanics approach (QM/MM) has been validated in a study of the substitution reactions: (i) (PH3)(2)Fe(CO)(3) + 2ER(3) <-> (ER3)(2)Fe(CO)(3) + 2PH(3) (ER3 = PMe3, PEt3, PMePh2, PPh3, PCyPh2, (PPr3)-Pr-i, PBz(3), PCy3, AsEt3, AsPh3); and (ii) Cp'Ru(PH3)(2)Cl + 2ER(3) <-> Cp'Ru(ER3)(2)Cl + 2PH(3) (Cp' = C5H5, C-5(CH3)(5); ER3 = PMe3, PEt3, (PBu3)-Bu-n, PMe2Ph, PMePh2, PPh3, AsEt3, P(OMe)(3), P(OPh)(3), P(OCH2)(3)CEt). The steric influence of the R substituents on the substitution enthalpies correlates well with experimental data. The combined QM/MM approach is also able to afford molecular structures in good accord with experimental estimates.

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页码：1457 / 1466

页数：10

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