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1H NMR titration by addition of excess 1/8 (b), 1/6(c) equivalent of Eu(OTf)3 to a 6 mM solution of [Eu(R-Phbipox)2)](OTf) in anhydrous acetonitrile (a) at 298 K and 500 MHz. Blue, green dots and red squares: trinuclear, mononuclear and heptanuclear (1) complexes, respectively.