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Hafnium Trialkyls Stabilized by Bulky, Electron‐Rich Aminopyridinates
Author(s) -
Hafeez Muhammad,
Kretschmer Winfried P.,
Kempe Rhett
Publication year - 2012
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.201100475
Subject(s) - hafnium , ethylene , substituent , catalysis , polymerization , chemistry , nuclear magnetic resonance spectroscopy , crystal structure , spectroscopy , crystallography , photochemistry , inorganic chemistry , organic chemistry , polymer , zirconium , physics , quantum mechanics
A series of hafnium aminopyridinates were synthesized and spectroscopically analyzed. In addition, selected examples of these hafnium complexes were characterized by X‐ray single crystal structure analysis. The aminopyridinato ligands used here carry an additional dialkylamine substituent to enhance the electron donating ability of the ligands. Structural data and low temperature NMR spectroscopic investigations are indicative of the increased donating ability of the ligands. Ethylene polymerization studies revealed a rather low catalytic activity most likely due to catalyst instability. Details of the deactivation reaction were investigated by NMR spectroscopy.