Document Detail

A comparative quantum chemical study of the ruthenium catalyzed olefin metathesis.
MedLine Citation:
PMID:  17639503     Owner:  NLM     Status:  PubMed-not-MEDLINE    
The accurate quantum mechanical description of homogeneous catalysis involving transition-metal complexes is a complicated and computationally demanding task. Hence, in this study the performance of different quantum chemical approaches with respect to the ruthenium catalyzed olefin metathesis of ethylene and RuCl(2)(PH(3))(2)CH(2) as a model system is investigated. All intermediates and transition states that are relevant for the rate determining steps of competing reaction mechanisms (associative and two dissociative pathways) are considered. Results from density functional theory calculations employing B-P86, B97-D, B3-LYP, TPSSh, and B2-PLYP functionals, as well as from MP2 and SCS-MP2 perturbation theory are compared to reference values (relative and reaction energies) obtained at the QCISD(T) level of theory. In particular, the applicability of AO basis sets of increasing size ranging from double-zeta to quadruple-zeta quality is evaluated for representative methods. For some reaction steps, large basis set effects on the order of 10 kcal mol(-1) (50% of Delta E) are observed. Double-zeta type basis sets yield very unreliable results while properly polarized triple-zeta sets provide reaction energies quite close to the basis set limit. The performance of recommended methods is B2-PLYP>TPSSh>B-86 approximately B97-D>SCS-MP2. The often used standard approaches B3-LYP and MP2 provide overall the largest errors. The accurate QCISD(T) computations predict in conclusion (and in agreement with a recent other study) that for the model system considered, the dissociative trans pathway is favored over the dissociative cis pathway and also over the associative reaction mechanism.
M Piacenza; I Hyla-Kryspin; S Grimme
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of computational chemistry     Volume:  28     ISSN:  0192-8651     ISO Abbreviation:  J Comput Chem     Publication Date:  2007 Nov 
Date Detail:
Created Date:  2007-08-27     Completed Date:  2007-10-25     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9878362     Medline TA:  J Comput Chem     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2275-85     Citation Subset:  -    
Copyright Information:
(c) 2007 Wiley Periodicals, Inc.
NNL National Nanotechnology Laboratory, CNR-INFM and Dipartimento di Ingegneria dell'Innovazione, Università di Lecce, Via Arnesano, I-73100 Lecce, Italy.
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