ISSN:
0009-2940
Schlagwort(e):
Cerium(IV) bis(porphyrinates)
;
Zirconium(IV) bis(porphyrinates)
;
Porphyrin, 2,3,7,8,12,13,17,18-octaethyl-5-methyl-
;
Geometrical isomerism
;
Chemistry
;
Inorganic Chemistry
Quelle:
Wiley InterScience Backfile Collection 1832-2000
Thema:
Chemie und Pharmazie
Notizen:
The synthesis of bis(2,3,7,8,12,13,17,18-octaethyl-5-methyl-porphyrinato)cerium(IV) and -zirconium(IV) [M(oemep)2; M = Ce, Zr, respectively] is described. The complexes were characterized by UV/Vis and IR spectroscopy and cyclic volt-ammetry. 1H-NMR spectra of the new cerium and zirconium sandwich complexes show that they exist as a mixture of vicinal and transversal isomers due to the rigid square-antipri-smatic coordination geometry found in metal(IV) bis(porphy-rinates). From the temperature dependence of the 1H-NMR spectra the rotational rigidity of the double-decker system was deduced. In toluene, free rotation of the two porphyrin macrocycles with respect to each other does not occur up to 373 K.
Zusätzliches Material:
3 Ill.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1002/cber.19961290213