Transition metal complexes with sterically demanding ligands. I. Synthesis and X-ray crystal structure of 1,5-cyclooctadiene palladium methyl triflate, (COD)Pd(Me)(OTf) and its cationic penta-coordinate adducts with sterically demanding 2,9-diaryl-substituted 1,10-phenanthroline ligands

The synthesis, use and X-ray crystal structure of the novel cyclooctadiene Pd–triflate methyl complex 1 is described. Evidence for ionization of the triflate ligand in 1 in solution is presented through IR, 19F-NMR and conductivity measurements. The high reactivity of this starting material is exemp...

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Bibliographic Details
Published inJournal of organometallic chemistry Vol. 575; no. 2; pp. 214 - 222
Main Authors Burger, Peter, Baumeister, JanM
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.03.1999
Subjects
Conductivity measurements
Palladium-triflate
Sterically demanding phenanthroline ligands
Triflate ionization
Trigonal-bipyramidal Pd complexes
Palladium-triflate
Sterically demanding phenanthroline ligands
Conductivity measurements
Triflate ionization
Trigonal-bipyramidal Pd complexes
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Summary:The synthesis, use and X-ray crystal structure of the novel cyclooctadiene Pd–triflate methyl complex 1 is described. Evidence for ionization of the triflate ligand in 1 in solution is presented through IR, 19F-NMR and conductivity measurements. The high reactivity of this starting material is exemplified through the preparation of the novel cationic pentacoordinate Pd complexes 4 and 5, from 1 and the sterically demanding 2,9-diarylsubstituted 1,10-phenanthroline ligands 2 and 3. Complexes 4 and 5 have a pseudo-trigonal bipyramidal structure and display significant differences of the binding mode of the two olefin moieties of the cyclooctadiene ligand. This has been substantiated through 1H- and 13C-NMR spectroscopic data and for complex 4 by an X-ray crystallographic study.
ISSN:0022-328X
1872-8561
DOI:10.1016/S0022-328X(98)00997-8