| 摘要 |
There is provided rare earth metal complexes of formula (I): wherein M is a cation, RE is a rare earth metal; X is a counter anion; and R, R, R, and R4 are each independently selected from hydrogen, alkyl of 1-8 carbon atoms, aryl, halo, and alkoxy. Also provided is a composition of europium bis(2,2'-bipyridine-N,N')-trinitrate with a diketonate dopant. The disclosure also provides processes for preparing the rare earth metal complexes. A mark comprising the rare earth metal complexes, and a method of applying the mark, are disclosed. The rare earth metal complexes may be used in printing systems, and for security applications.
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