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Synthesis and characterization of Ln(BTFA)3DMPHEN complexes (Ln= Eu3+, Er3+, Ho3+, Tb3+, Tm3+,AND Yb3+, BTFA=4,4,4-triflouro-1-phenyl-1,3-butanedione,dmphen=4,7-dimethyl-1,10-phenathroline) and sol-gel materials for potential optical applications
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