Multifunctional luminescent magnetic cryocooler in a Gd5Mn2 pyramidal complex. Issue 33 (16th February 2018)

• Record Type: Journal Article
• Authors: Huang, Wei; Huang, Shuaidan; Zhang, Ming; Chen, Yancong; Zhuang, Gui-Lin; Li, Yao; Tong, Ming-Liang; Yong, Juan; Li, Yujie; Wu, Dayu
• Is Part Of: Chemical communications. Volume 54:Issue 33(2018)
• Page Start: 4104
• Page End: 4107
• Publication Date: 2018-02-16
• Subjects: Chemistry -- Periodicals; 540
• DOI: 10.1039/c8cc00433a
• Languages: English
• ISSNs: 1359-7345

Abstract

Abstract : A [GdIII5MnII2] pyramidal complex was developed for multifunctional PL, ML, and MCE applications involving red-light sources, thermometers, and stress imaging. In particular, this provides a novel resolution to design a visualized PL cooler. Abstract : Magnetic cooling is a highly efficient refrigeration technique with the potential of replacing expensive and rare helium-3 in the field of ultra-low temperature cooling. However, the visualization of a cryogen at an extremely low temperature and in a strong magnetic field is challenging, but it is crucial for the precise positioning and in situ thermal probe measurements in potential practical applications. Here, the activation of a red-emissive Mn(ii ) ion using 3d/4f chemistry produces a luminescent molecule cooler, [Gd5 Mn2 (L OMe )2 (OH)4 (Ac)6 (MeOH)10 Cl2 ]Cl3 ·2MeOH (1 ), with the core of an Mn(ii )-anchored heptanuclear [GdIII5MnII2] pyramid. The photoluminescence (PL) of the Mn 2+ emission, with a large Stokes shift ( λ em ∼ 690 nm) from 4 T1 ( 4 G) → 6 A1 ( 6 S), shows not only a sensitive temperature sensing property but also reversible mechanoluminescence (ML). More attractively, these findings reveal a considerable magnetocaloric effect (MCE) coupled with a tunable emission window, opening up new opportunities in the multifunctional applications of PL, ML, and the MCE involving red-light sources, thermometers, and stress imaging. In particular, this provides a novel resolution to design visualized PL coolers.