The series of homoleptic tetranuclear [Ln4(L)2(HL)2(NO3)2(OH)2]·2(NO3) (Ln = Nd, 1; Ln = Yb, 2; Ln = Er, 3; Ln = Gd, 4) have been self-assembled from the reaction of the Salen-type Schiff-base ligand H222L with Ln(NO3)3·6H2O (Ln = Nd, Yb, Er or Gd), respectively (H222L: N,N′-bis(salicylidene)cyclohexane-1,2-diamine). The result of their photophysical properties shows that the strong and characteristic NIR luminescence for complexes 1 and 2 with emissive lifetimes in microsecond ranges are observed and the sensitization arises from the excited state (both 1LC and 3LC) of the Salen-type Schiff-base ligand with the flexible linker.
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