Improved syntheses of the cationic arene complexes of vanadium( I), [V( C0)4(CsHs-nMen)+] ,a re reported together with their 1 H n.m.r. spectra. An X-ray crystal and molecular structure determination of the title compound has been carried out. Crystals are monoclinic, space group P&/a, a = 18.135(5), & = 12.746(4), c = 10.025(4) A, Q = 93.03(2)",a nd Z = 4. R = 0.072 for 1 007 observed reflections (Mo-K, radiation). In the cation the vanadium atom is half-sandwiched between the arene ligand and the four carbonyl groups, the tatter being oriented in such a way as to become eclipsed with respect to two of the methyl groups. The [V(CO)s]- anion is a nearly regular octahedron with a mean V-C distance of 1.93 A and two sets of C-V-C angles, thus leading to a slight trigonal elongation of the octahedron.
THE REACTION OF HEXACARBONYLVANADIUM WITH AROMATIC-COMPOUNDS .4. PROPERTIES OF TETRACARBONYLVANADIUM ARENE CATIONS AND THE CRYSTAL AND MOLECULAR-STRUCTURE OF TETRACARBONYL(1,2,4,5-TETRAMETHYLBENZENE)VANADIUM(I) HEXACARBONYLVANADATE(1-)
CALDERAZZO, FAUSTO;PAMPALONI, GUIDO;VITALI, DARIO;
1982-01-01
Abstract
Improved syntheses of the cationic arene complexes of vanadium( I), [V( C0)4(CsHs-nMen)+] ,a re reported together with their 1 H n.m.r. spectra. An X-ray crystal and molecular structure determination of the title compound has been carried out. Crystals are monoclinic, space group P&/a, a = 18.135(5), & = 12.746(4), c = 10.025(4) A, Q = 93.03(2)",a nd Z = 4. R = 0.072 for 1 007 observed reflections (Mo-K, radiation). In the cation the vanadium atom is half-sandwiched between the arene ligand and the four carbonyl groups, the tatter being oriented in such a way as to become eclipsed with respect to two of the methyl groups. The [V(CO)s]- anion is a nearly regular octahedron with a mean V-C distance of 1.93 A and two sets of C-V-C angles, thus leading to a slight trigonal elongation of the octahedron.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
