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Synthesis and Spectroscopic Characterization of l-aspartic Acid Complexes with Metals of the Lanthanides Family

Mohamed M. E.

International Letters of Chemistry, Physics and Astronomy

2013

Vol. 6

91-115

The complexes between l-aspartic acid and metals of lanthanide series (La3+, Pr3+, Eu3+, Gd3+) have been prepared and characterized using a variety of techniques including, infrared spectroscopy, 1H NMR, 13C NMR, elemental analysis and metal contents. The sought metal effect on the electronic environment of the chiral carbon and its neighbouring atoms was observed in case of Europium and Praseodymium. The 13C downfield shift indicates a lower electron density at the carbon with consequent downfield shift observed on the ?-H attached to it increasing its acidity.

Dimeric Silver(I) Complexes with Trimethylphosphine and Aliphatic Perfluorinated Carboxylates

Szłyk E., Łakomska I.

Polish Journal of Chemistry

2002

Vol. 76 / nr 10

1399-1403

Silver(I) complexes with trimethylphosphine and perfluorinated carboxylates of general formula [{Ag(PMe3)2}2(_-OOCR)2], where R = CF3, C2F5, C3F7, C4F9, C7F15, have been prepared and characterized with IR, 1H, 13C, 19F, 31P NMR. Spectral analysis suggests four coordinated Ag(I) with two monodentate trimethylphosphine and bidentate carboxylates forming bridges between silver(I) ions. Thermal decomposition process was studied between 293-973 K in nitrogen. Decomposition proceeds in one exothermic stage corresponding to the elimination of perfluorinated carboxylate and trimethylphosphine. The final product was a mixture of metallic silver and carbon, formed between 473-633 K.