ISSN:
1434-4475
Keywords:
Complex formation
;
Coupling constants,15N−Hand 15N−13C
;
Enaminopyrazolones
;
NMR spectroscopy (15N,13C,1)
;
Pyrazole azomethines
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract In the reaction of 4-aminomethylene-Δ2-pyrazolin-5-ones with metal acetates new chelate complexes with a ligand-metal ratio of 2:1 are formed. For structural investigations15N-labeled compounds and azomethines of the pyrazole type are also prepared. The15N-,13C-, and1H-chemical shifts have been measured in CDCl3. Chemical shifts as well as coupling constantsnJ (13C−15N)n=1, 2;2 J (HC=15N);2 J (=CH−15N) are discussed with regard to the structure of metal complexes and azomethines. It has been shown that complex formation causes a considerable change of the π-electron structure within the merocyanin part.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00906247
Permalink