Multifunctional luminescent magnetic cryocooler in a Gd5Mn2 pyramidal complex

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 c...

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Bibliographic Details
Published in:Chemical communications (Cambridge, England) England), 2018, Vol.54 (33), p.4104-4107
Main Authors: Huang, Wei, Huang, Shuaidan, Zhang, Ming, Chen, Yancong, Gui-Lin, Zhuang, Yao, Li, Ming-Liang, Tong, Yong, Juan, Li, Yujie, Wu, Dayu
Format: Article
Language:English
Subjects:
Air conditioning
Coolers
Cooling
Emission
Gadolinium
Helium
Helium isotopes
Light sources
Magnetic cooling
Mechanoluminescence
Photoluminescence
Refrigeration
Thermal imaging
Thermometers
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Summary: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, [Gd5Mn2(LOMe)2(OH)4(Ac)6(MeOH)10Cl2]Cl3·2MeOH (1), with the core of an Mn(ii)-anchored heptanuclear [Gd5IIIMn2II] pyramid. The photoluminescence (PL) of the Mn2+ emission, with a large Stokes shift (λem ∼ 690 nm) from 4T1(4G) → 6A1(6S), 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.
ISSN:1359-7345
1364-548X
DOI:10.1039/c8cc00433a