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Synthesis of Oligomeric Zinc Complexes with Bicyclic and Acyclic Guanidinate Ligands
Author(s) -
Neuhäuser Christiane,
Reinmuth Matthias,
Kaifer Elisabeth,
Himmel HansJörg
Publication year - 2012
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201101223
Subject(s) - chemistry , dimethylzinc , bicyclic molecule , deprotonation , medicinal chemistry , zinc , pyridine , intramolecular force , quinoline , hydrogen bond , alkyl , stereochemistry , organic chemistry , molecule , ion
Zinc dichloride and dimethylzinc were treated with several acyclic and bicyclic guanidines. Three different bicyclic guanidines and their potassium guanidinate salts were treated with ZnCl 2 . The reaction with the neutral guanidines afforded mononuclear complexes, stabilized by intramolecular hydrogen bonding. The reaction with the potassium guanidinate salts led to trinuclear complexes, which were extremely water sensitive. The reaction in the presence of added water furnished a tetranuclear complex with a central OZn 4 unit in good yield, to which six guanidinate ligands were bound. The reaction of dimethylzinc with 2‐[ N , N ′‐diisopropylguanidino]pyridine and 2‐[ N , N ′‐diisopropylguanidino]quinoline afforded di‐ and tetranuclear Zn methyl complexes with mono‐ and dianionic guanidinate ligands. Dinuclear complexes of the monoanionic guanidinate ligands were formed at room temperature. At higher temperatures (75 °C), complete deprotonation of the guanidino groups and formation of tetranuclear Zn alkyl complexes was observed, which feature low‐coordinate zinc sites.