| Abstract: | Tripodal Bis(2,6‐iminophosphoranyl)pyridine Ligands: Iron and Cobalt Complexes with a Potential in Ethene Polymerisation By Staudinger Reaction of bis‐2,6‐diphenylphosphanyl‐pyridine with aryl‐, alkyl‐ and silylazides tripodal ligands L = 2,6‐(Ph2P=NR)2C5H3N (R = Ph 1 a , Mes 1 b , Ad 1 c , SiMe3 1 d ) are synthesized. The reaction of ligand 1 b with equimolar amounts of CoCl2(THF)2] and FeCl2(THF)1.5] in THF does not lead to the expected neutral complexes (k3‐L)MCl2] but to coordination compounds of the composition L2(CoCl2)3 ( 2 a ) und L(FeCl2)2 ( 3 ). By using acetonitrile as solvent or by crystallisation of 2 a from hot acetonitrile the cationic complex (k3‐L)CoCl(MeCN)]Cl ( 2 b ) is formed as a second product. The molecular structure 2 b has been characterized by an X‐ray single crystal structure analysis (triclinic, P1, Z = 2, a = 1299.8(1), b = 1488.8(2), c = 1674.2(2) pm, α = 82.911(13)°, β = 76.715(12)°, γ = 72.758(11)°). A preliminary test with 3 shows, that coordination compounds of the ligand system introduced here have potential as catalysts in methyl alumoxane mediated ethene polymerisation. |
