Thermally-transferable fluorescent europium complexes
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United States of America Patent
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Apr 9, 1991
Grant Date -
N/A
app pub date -
Mar 13, 1990
filing date -
Mar 13, 1990
priority date (Note) -
Expired
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Abstract
A donor element for thermal transfer comprising a support having on one side thereof a fluorescent europium complex dispersed in a polymeric binder. In a preferred embodiment, the complex has the formula: ##STR1## wherein: D is a substituted or unsubstituted, aromatic, 5- or 6-membered carbocyclic or heterocyclic moiety; and J is --CF.sub.3, --CH.sub.3, --CH.sub.2 F or --CHF.sub.2. In another preferred embodiment, the europium atom may also have attached thereto at least one monodentate ligand with an electron-donating oxygen or nitrogen atom or at least one bidentate ligand with two electron-donating oxygen, nitrogen or sulfur atoms atoms capable of forming a 5- or 6-membered ring with the europium atom.
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