Coordination chemistry of chelating nitrogen ligands with tungsten carbonyl nitriles
摘要:
The reactions of a series of Schiff base ligands (1-4) prepared by condensation of pyridine-2-carboxaldehyde and 2-X-anilines (X = F, Cl, Br, OMe) with W(CO)3(RCN)3 results in the formation of deeply coloured complexes W(CO)3(1-4)(NCR) which readily react with carbon monoxide to afford W(CO)4(1-4). The ligand 5, prepared from pyridine-2-carboxaldehyde and N,N-dimethylethylenediamine, coordinates to W(CO)3 through the conjugated pyridine-imine chelate to afford complexes with a pendant dimethylamino group which reacts with electrophiles. Of the ligands studied, only the bis-amine, pyridine ligand 8, coordinates to W(CO)3 in a tridentate manner. These reactions provide insight into the geometric and electronic factors which influence coordination of nitrogen containing ligands at a fac-tricarbonyl metal centre.
DOI:
10.1016/s0277-5387(00)84197-2
作为产物:
描述:
丁腈 、 六羰基钨 以
neat (no solvent) 为溶剂,
以63%的产率得到fac-W(CO)3(NCPr)3