Coumarins as ligands. Studies on metal complexes of 8-Amino-7-hydroxy-4-methylcoumarin and 7-Hydroxy-4-methylcoumarin-6-carboxylic acid
- 1 January 1972
- journal article
- research article
- Published by CSIRO Publishing in Australian Journal of Chemistry
- Vol. 25 (4) , 729-737
- https://doi.org/10.1071/ch9720729
Abstract
Some platinum and rare earth metal complexes of 8-amino-7-hydroxy-4- methylcoumarin, viz. Na2[R~(C10H2NO3)Cl4],H2O, [Ir(C10H8N03)2(0H)(H20)],- 3H20, [Ce(C10H8NO3)3(H2O)2I,6H2O, and [Pr(C10H8N03)3(H20)2],8H2O, and 7-hydroxy-4-methylcoumarin-6-carboxylic acid, viz. [Pd(CllH7O5)2], [Ce(CllH705)3- (H20)2],3HzO, and [Pr(CllH7O5)3(H2O)2], have been studied. These complexes have been isolated and characterized by analyses, conductometric, magnetic, and spectroscopic studies. An octahedral stereochemistry has been assigned to these complexes except for the PdII complex which has a typical square-planar stereo- chemistry. The visible spectra of the PrIII complexes show characteristic f-f transitions and the nephelauxetic effect (1-β) of these transitions has been evaluated.Keywords
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