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Luminescent Ir(III)–Ln(III) coordination polymers showing slow magnetization relaxation

Abstract

A series of iridium(III)-lanthanide(III) bimetallic coordination polymers were successfully obtained by hydrothermal reactions based on the Ir unit [Ir(ppy)2(Hdcbpy)], namely, [Ln{Ir(ppy)2(dcbpy)}2(NO3)(H2O)n]solvent (Ir2Ln, n = 5, Ln = Gd, Dy; n = 4, Ln = Er, Yb) and [Ln2(OH){Ir(ppy)2(dcbpy)}4(NO3)(H2O)4]·solvent (Ir4Ln2, Ln = Gd, Dy, Er, Yb). Compounds Ir2Ln show chain structures in which the lanthanide ions are bridged by Ir(ppy)2(dcbpy)- ligands through carboxylate groups. Compounds Ir4Ln2 display double-chain structures, where dimers of Yb2(OH) are connected by Ir(ppy)2(dcbpy)- ligands. Magnetic studies reveal that Ir2Dy and Ir4Dy2 exhibit slow magnetic relaxation behaviour at zero dc field characteristic of single molecule magnet, but Ir2Er, Ir2Yb, Ir4Er2 and Ir4Yb2 require a field to induce such characteristics. Moreover, since the iridium(III) moiety can serve as an “antenna” to effectively sensitize the f-f transitions of the lanthanide ions, near-infrared luminescence was observed for the YbIII and ErIII complexes. As far as we know, this is the first observation of SMM behaviour and NIR luminescence in iridium(III)-lanthanide(III) bimetallic coordination polymers.

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Supplementary files

Article information


Submitted
20 Nov 2019
Accepted
13 Jan 2020
First published
13 Jan 2020

Inorg. Chem. Front., 2020, Accepted Manuscript
Article type
Research Article

Luminescent Ir(III)–Ln(III) coordination polymers showing slow magnetization relaxation

K. Fan, S. Bao, R. Huo, X. Huang, Y. Liu, Z. Yu, M. Kurmoo and L. Zheng, Inorg. Chem. Front., 2020, Accepted Manuscript , DOI: 10.1039/C9QI01504C

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