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The reaction of the zinc(II) Schiff base complex ZnL [H2L = N,N′-bis(3-methoxysalicylidene)ethylene-1,2-diamine] with one equivalent of Ln(NO3)3·xH2O (Ln = Nd, Ho, Er or Yb) gives the neutral 3d-4f bi-metallic Schiff base complexes [Zn(NO3)(μ-L)Ln(NO3)2(H2O)], which in solution exhibit emission corresponding to the Ln(III) ions (Ln = Nd, Er and Yb) in the near-infrared region.
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Wong et al. (2002) studied this question.
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