Temperature‐Dependent Fluorescence of Cu₅ Metal Clusters: A Molecular Thermometer

Abstract

Warm oder kalt? Ein Cu5‐Metallcluster hat markante photophysikalische Eigenschaften, die in Lösung und Festkörper zwischen −45 und +80 °C in einer temperaturabhängigen Fluoreszenzquantenausbeute und Lebensdauer angeregter Zustände resultieren. Der Komplex ermöglicht eine beispiellose Genauigkeit der Temperaturbestimmung durch Fluoreszenzmessungen und eignet sich damit für Anwendungen z. B. in der Biologie und den (Nano)materialwissenschaften.

Different Color Emissive Copper Nanoclusters for Cancer Cell Imaging

“…This observation is consistent with the previously reported work by Rivas and co‐workers, which describes that only copper nanoclusters in which the number of copper atoms within the nanocluster is ≤13 show fluorescence . Many other groups have reported fluorescent metal clusters with Cu, Cu 4 , Cu 6 , Cu 7 , and Cu 9 metallic frameworks. XPS and FT‐IR studies for the orange‐red CuNCs suggest the presence of chemisorbed S atom and the absence of S−H of glutathione indicating the presence of the Cu−S bond in the cluster.…”

Organic Fluorescent Thermometers Based on Borylated Arylisoquinoline Dyes

“…Fluorophore-modified organic polymers in which temperature-dependent conformational changes and connected variations of the microenvironment of the fluorophore constitute the basic design principle were also used abundantly. [4,[18][19][20][21][22][23][24] Inorganic luminescent compounds and materials such as nanoparticles, [25][26][27][28][29] metal-organic frameworks, [30] metal clusters, [31] and organometallic complexes [32][33][34][35][36][37][38] have received increased attention as well.…”

Bright-yellow to orange-red thermochromic luminescence of an AgI6–ZnII2 heterometallic aggregate

“…5 Recently, Prodi group reported a cluster-based fluorescence thermometry, trizwitterionic dicationic Cu 5 clusters, which exhibit excellent thermochromic luminescence performance in the range between −45 and +80 °C with the high sensitivity and the high temporal (sub-millisecond) and spatial (sub-micrometer) resolution. 6 Anyway, despite some sporadic reports on thermochromic phosphors, dyes, and coordination compounds, 7 these kinds of smart molecules are still in their infancy. Based on our previous work 8 and inspired by the exploration of thermochromic luminescent materials, 9 we used the liquid-liquid diffusion method to assemble a heterometallic Ag I 6 -Zn II 2 aggregate based on a [Ag 6 (mna) 6 ] 6− metalloligand (hereafter, [Ag 6 (mna) 6 ] 6− is abbreviated as L Ag ), 10 namely,…”