Substitution reactions of metallic complexes of .beta.,.beta.',.beta.''-triaminotriethylamine. 13. Kinetics of solvolysis of the dichloro(.beta.,.beta.',.beta.''-triaminotriethylamine)cobalt(III) and -chromium(III) cations in nonaqueous media and synthesis and characterization of some cobalt(III) and chromium(III) halo-tren complexes containing coordinated neutral nonaqueous ligands

Saliby, Michael J.; West, D. E.; Madan, Stanley K.

doi:10.1021/ic50217a016

Cited by 9 publications

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“…The better performance of 7 may be partly attributed to the unique geometric properties of the tren ligand, which have been shown to greatly affect the kinetics of substitution reactions in chromium complexes. 39,40 Generally, from these studies it is clear that tripod ligands are better suited to stabilise and protect the metal centre during the catalytic cycle than related bidentate ligands. The results from the catalytic testing of the imidazole chelated complexes show that, in agreement with the metal centres residing in a bis(imidazole) framework, these complexes display similar activities and selectivities, with the observed differences arising from variations in the additional substituents and donor centres respectively.…”

Section: Catalysismentioning

confidence: 99%

Synthesis, characterisation and catalytic behaviour of a novel class of chromium(iii) and vanadium(iii) complexes containing bi- and tri-dentate imidazole chelating ligands: a comparative study

Rüther

Cavell

Braussaud

et al. 2002

J. Chem. Soc., Dalton Trans.

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The syntheses and characterisation of tri-and bi-dentate coordinated chromium() and vanadium() complexes of the general compositionThe molecular structure of 3gЈ shows the chromium atom is quasi-octahedral, six-coordinate, the three coordinated chlorine atoms disposed mer in the coordination sphere. The electronic spectra of the chromium complexes exhibit d-d transitions typical of a pseudo-octahedral coordinated d 3 ion, falling into the region ν 1 4 A 2g 4T 2g 600-700 nm and ν 2 4 A 2g 4 T 1g (F) 430-470 nm, and 10Dq values between 14 400 and 16 700 cm Ϫ1 . In the presence of MMAO the complexes give active catalyst systems for the conversion of ethylene into 1-alkenes or polymers, with activities and selectivities depending on the electronic and steric factors of the ligand system and the metal centre, respectively.

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Section: Catalysismentioning

confidence: 99%