TY - JOUR
T1 - Heterocyclische Carbene IV. Metallkomplexe mit heterocyclischen Carben-Liganden
T2 - Synthese, Struktur, Strukturdynamik
AU - Öfele, Karl
AU - Herrmann, Wolfgang A.
AU - Mihalios, Dimitrios
AU - Elison, Martina
AU - Herdtweck, Eberhardt
AU - Priermeier, Thomas
AU - Kiprof, Paul
PY - 1995/8/9
Y1 - 1995/8/9
N2 - Group-VI transition metal complexes of heterocyclic carbene ligands are obtained in 41-45% yields through reaction of azolium precursor salts with carbonyl metallates. Dicarbene complexes of the type cis-M(CO)4 (L∧L) and fac-M(CO)3(L)3 (M = Cr, Mo, W) are obtained by optimal choice of the heterocyclic azolinylidene ligands (I = mimidazolinylidene, I∧I = imidazolinylidene-methylene-imidazolinylidene, and I∧I = imidazolinylidene-methylene-benzimidazolinylidene) with respect to their donor and acceptor properties. These complexes reflect the electronic properties of their carbene ligands. The tungsten complex cis-W(CO)4(I∧BI), exhibiting a mixed-carbene chelate ligand, and the molybdenum complex, representative of the first example of a tris(carbene) complex of the type fac-Mo(CO)3(I)3, were characterized by means of single crystal X-ray diffraction studies. Substituted complexes of the type fac-Mo(CO)3(L∧L)L′ (L′ = pyridin, P(C6H5)3, P(OCH3)3, tBuNC, I) were synthesized and structurally characterized for for the example of fac-M(CO)3(L∧L)[P(C6H5)3]. Low-temperature NMR-spectroscopy reveals a dynamic behavior for certain chelating dicarbene ligands, which process implies a butterfly-type conformational movement.
AB - Group-VI transition metal complexes of heterocyclic carbene ligands are obtained in 41-45% yields through reaction of azolium precursor salts with carbonyl metallates. Dicarbene complexes of the type cis-M(CO)4 (L∧L) and fac-M(CO)3(L)3 (M = Cr, Mo, W) are obtained by optimal choice of the heterocyclic azolinylidene ligands (I = mimidazolinylidene, I∧I = imidazolinylidene-methylene-imidazolinylidene, and I∧I = imidazolinylidene-methylene-benzimidazolinylidene) with respect to their donor and acceptor properties. These complexes reflect the electronic properties of their carbene ligands. The tungsten complex cis-W(CO)4(I∧BI), exhibiting a mixed-carbene chelate ligand, and the molybdenum complex, representative of the first example of a tris(carbene) complex of the type fac-Mo(CO)3(I)3, were characterized by means of single crystal X-ray diffraction studies. Substituted complexes of the type fac-Mo(CO)3(L∧L)L′ (L′ = pyridin, P(C6H5)3, P(OCH3)3, tBuNC, I) were synthesized and structurally characterized for for the example of fac-M(CO)3(L∧L)[P(C6H5)3]. Low-temperature NMR-spectroscopy reveals a dynamic behavior for certain chelating dicarbene ligands, which process implies a butterfly-type conformational movement.
UR - http://www.scopus.com/inward/record.url?scp=25944446866&partnerID=8YFLogxK
U2 - 10.1016/0022-328X(94)05261-9
DO - 10.1016/0022-328X(94)05261-9
M3 - Artikel
AN - SCOPUS:25944446866
SN - 0022-328X
VL - 498
SP - 1
EP - 14
JO - Journal of Organometallic Chemistry
JF - Journal of Organometallic Chemistry
IS - 1
ER -