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New Donor‐Functionalized Cp Ligands: Synthesis and Complexation Behaviour of Quinoxalyl and Benzothiadiazolyl Systems
Author(s) -
Schuhen Katrin,
Sieb David,
Wadepohl Hubert,
Enders Markus
Publication year - 2009
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.200900100
Subject(s) - chemistry , ligand (biochemistry) , nucleophile , chelation , catalysis , metal , chromium , polymerization , stereochemistry , medicinal chemistry , combinatorial chemistry , polymer chemistry , inorganic chemistry , organic chemistry , polymer , biochemistry , receptor
Sodium cyclopentadienide reacts as nucleophile with 4,7‐dibromo‐2,1,3‐benzothiadiazole (BTZ) and leads to the new donor‐functionalized ligand Cp BTZ . Related quinoxalyl Cp systems have been prepared 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 centre so that it cannotcoordinate in a chelating manner. With Cp BTZ ligand derivatives severalmetal complexes have been synthesized. The new chromium(III) complex Cp BTZ CrCl 2 ( 12 ) becomes upon activation an active catalyst for the polymerization of ethylene. Relying on DFT calculations and analysis of spin‐density distribution combined with paramagnetic NMR data a chelating coordination of the Cp BTZ ligand is feasible in 12 .