| http://www.w3.org/ns/prov#value | - In one group of compounds represented by Formula I, M is selected from Eu, Tb, Dy, Sm, Rh, Re, Ru, Cr, and In; n varies from 1 to 5; X1 is an antenna; each of X2 and X3 is independently ???O???, ???NH(CH2)aOH, ???NH(CH2)aCO2H, ???NH(CH2)aSO3 ???, or ???O(CH2)aSO3 ???; a ranges from 1 to 6; each of Y1 and Y2 is independently a single bond, ???(CH2)m???, ???(CH2)mO???, ???(CH2)mOCO???, ???CH2)mCO2??
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