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Optical properties of europium compounds with L- and DL-α-alanine-hydroxamic acids.
Autorzy
Rok wydania
1996
Czasopismo
Numer woluminu
90
Strony
439-446
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
Two of europium complexes with L- and DL-α-alanine-hydroxamic acidswere synthesized. To our knowledge tley are the frrst examples of X-ray andspectral data of lanthanide single crystals with hydroxamic acid derivatives.Both compounds consist of dlmers in their structures, formed by two OHbridging groups of amino-hydroxamic acid molecules. Besides, two metalions are chelated by CO and OH groups, forming frve-membered rings. Inthe complex with L-ligand, differennt than in the DL-one, two additional per-chloric acid molecules are included in crystal cavities and form hydrogenbondings witl nitrogen and oxygen atoms of the ligand. Absorption, emis-sion and excitation spectra were measured and analyzed at room and lowtemperatures. Structural effect of ligand chirality was found and its spec-troscopic conseqnences are reported. Tle effect of the dimeric structure onspectroscopic properties is discussed.
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