New donor-functionalized Cp ligands : synthesis and complexation behaviour of quinoxalyl and benzothiadiazolyl systems
Zeitschrift für anorganische und allgemeine Chemie. Bd. 635. H. 11. Weinheim: Wiley-VCH 2009 S. 1560 - 1567
Erscheinungsjahr: 2009
ISBN/ISSN: 1521-3749
Publikationstyp: Zeitschriftenaufsatz
Sprache: Englisch
Doi/URN: 10.1002/zaac.200900100
Inhaltszusammenfassung
Sodium cyclopentadienide reacts as nucleophile with 4,7-dibromo-2,1,3-benzothiadiazole (BTZ) and leads to the new donor-functionalized ligand CpBTZ. Related quinoxalyl Cp systems have been prepd. using Pd-catalyzed coupling with zincated Cp-metal complexes. The new ligands comprise two N-donor atoms; one of them is located in a distal position relative to the metal center so that it cannot coordinate in a chelating manner. With CpBTZ ligand derivs. several metal complexes have been synthes...Sodium cyclopentadienide reacts as nucleophile with 4,7-dibromo-2,1,3-benzothiadiazole (BTZ) and leads to the new donor-functionalized ligand CpBTZ. Related quinoxalyl Cp systems have been prepd. using Pd-catalyzed coupling with zincated Cp-metal complexes. The new ligands comprise two N-donor atoms; one of them is located in a distal position relative to the metal center so that it cannot coordinate in a chelating manner. With CpBTZ ligand derivs. several metal complexes have been synthesized. The new chromium(III) complex CpBTZCrCl2 (12) becomes upon activation an active catalyst for the polymn. of ethylene. Relying on DFT calcns. and anal. of spin-d. distribution combined with paramagnetic NMR data a chelating coordination of the CpBTZ ligand is feasible in 12.» weiterlesen» einklappen
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