ISSN:
0009-2940
Keywords:
Benzamidinate
;
Zirconium complexes
;
Allyl ligands
;
Chemistry
;
Inorganic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
Complexes of the type (siam)2Zr(allyl)2 (1a) and (siam)Zr(allyl)nClm are described (2a: n = 1, m = 2; 2b: n = 2, m = 1; 2c: n = 3, m = 0; siam: N,N′ -bis(trimethylsilyl)benzamidinato group). The molecular structure of 1a shows that both allyl groups are differently bonded. One allyl ligand is η3-, the other η1-coordinated. The X-ray crystal structure of the tris-(allyl) complex 2c shows a chiral molecule with two η3-allyl ligands. The third allyl ligand is coordinated in a mode intermediate between η3 and η1, thus serving as a model for an intermediate in the η3-η1 intramolecular rearrangement of the allyl ligands observed in solution. Temperature-dependent 1H- and 13C-NMR spectra of 1a, 2b and 2c indicate a rapid η1-η3 rearrangement of the allyl groups at 60°C. At -50°C two different coordination modes of the allyl groups can be observed in the case of 2b and 2c.
Additional Material:
3 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/cber.19961291113
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