Assembly of a Heterotrimetallic Zn 2 Dy 2 Ir Pentanuclear Complex toward Multifunctional Molecular Materials.

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