Rational selection of metal ions and organic ligands to synthesize metal-organic complexes (MOCs) is necessary for constructing multifunctional materials. Herein, we have obtained a novel heterotrimetallic ZnDyIr pentanuclear MOC by the assembly of Dy, luminescent Zn(valpn), and [Ir(HL)(ppy)]Cl metalloligands (Hppy = 2-phenylpyridine, HL = 2,2'-bipyridine-5,5'-di--benzoic acid). Single-crystal structural analysis shows that the central [Ir(L)(ppy)] bridges two ZnDy moieties using two carboxylates of L. Measurements of organic light-emitting diodes (OLEDs) show that the maximum luminance is 284.2 cd/m and the turn-on voltage is 6 V. Magnetic studies reveal that ZnDyIr is a field-induced single-molecule magnet (SMM) with an energy barrier of 19.1(2) K under a 2 kOe dc field. ZnDyIr shows luminescence sensing with a quenching efficiency of up to 99.0% for 2,4,6-trinitrophenol (TNP).
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