ISSN:
1434-4475
Keywords:
Keywords. Paramagnetic; Five-fold coordinated trigonal bipyramidal cobalt(III) complex; Crystal structure; Octaphenyl-tetraphospha-diazene; Imido-tetraphenyl-diphosphinate; Octacarbonyldicobalt.
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Summary. The reaction of Co2(CO)8 and Ph2P-N*PPh2-PPh2*N-PPh2 (1) in a molar ratio between 1:1 and 1:3 in toluene always leads to the formation of both the yellow by-product [fac-Co(CO)3(Ph2P-N*PPh2-PPh2*N-PPh2-P,P′)] [Co(CO)4] (4) and the red compound [(Co)2(μ-CO)(CO)4(μ-Ph2P-N-PPh2)2] (5) that has already been characterized by spectroscopic data and X-ray analysis. Whereas 4 is obtained as a precipitate, the red compound 5 stays in solution and reacts in presence of air with the remaining ligand 1 in a non-stoichiometrical reaction to the violet cobalt(III) complex [Co(η1-O-PPh2*N-PPh2*O)(η2-O-PPh2*N-PPh2*O)2] (6). The crystal structure of 6 proves a distorted trigonal bipyramidal coordination of the oxygen atoms at the Co(III) ion. Surprisingly, complex 6 shows an unusual paramagnetism according to four unpaired electrons (5.21±0.04 BM).
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s007060050300
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