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Aryl Phosphine Nickel(II) and Palladium(II) Complexes with N,O‐Amino‐carboxylate Chelate Ligands [(Aryl)(R 3 P)M(N,O‐α‐aminocarboxylate)](M = Ni, Pd). Catalysts for the Polymerization of Olefins
Author(s) -
Ponikwar Walter,
Mihan Shahram,
Sünkel Karlheinz,
Beck Wolfgang
Publication year - 2006
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.200600174
Subject(s) - palladium , nickel , aryl , phosphine , catalysis , chemistry , carboxylate , chelation , ethylene , polymerization , medicinal chemistry , polymer chemistry , polymer , stereochemistry , inorganic chemistry , organic chemistry , alkyl
The title complexes [(Aryl)(R 3 P)M(N,O‐α‐aminocarboxylate)] (M = Ni, Pd) were synthesized by reaction of [( o ‐tolyl)(Ph 3 P) 2 NiBr] or of [( p ‐Me 3 CC 6 H 4 )( o ‐tolyl 3 P)Pd(μ‐Br)] 2 with the anions of α‐amino acids. The spectroscopic data indicate that the nickel complexes are formed as mixtures of isomers, whereas for the palladium complexes only one isomer is observed. The complex [( o ‐tolyl)(Ph 3 P)Ni(glycinate)] is – in the presence of AlEt 3 – a highly active catalyst for the polymerization of ethylene [up to 1800 kg PE / (mol Ni·h)] and gives polymers with remarkably high molecular weights (up to 900.000 g/mol) and with few branchings.