Publication date: 17th July 2025
Multiphoton excitation can enable near-infrared (NIR) activation of well-known
chromophores, but it requires high-power ultrashort-pulsed lasers and suffers from
drawbacks, such as photobleaching and short luminescence lifetimes. Long-lived
emissive probes are of great interest for photoluminescence imaging and NIR-to-
visible (Vis) molecular photon upconversion (UC).
Such probes can include transition metal complexes and organic compounds with
extended conjugation, capable of room-temperature phosphorescence, while organic
dyes can display delayed fluorescence, and lanthanide cations can be sensitized by
antenna chromophores. However, none of these systems exhibit UC behavior upon
NIR-excitation, an essential feature for practical photonic applications, such as
photocatalysis, bioimaging, and sensing.
Remarkably, high-nuclearity compounds constituted of rigid metal cores (lanthanides)
encapsulated by organic ligands, are emerging as the next generation of optical
materials.
We report here on the successful synthesis of a homometallic lanthanide (Yb) MCA,
including in its structure an organic chromophore covalently linked to ytterbium, and
determined its crystalline structure and their potential application in temperature
sensing.
MINECO (PID2023-152131NB-I00 and PID2020-115710GBI00);
AEI (CEX2019 000919-M); GVA (CIPROM/2022/57, IDIFEDER/2018/064 and
IDIFEDER/2021/064), all of them partially cofinanced with FEDER funds. This study
forms part of the Advanced Materials Programme (MFA/2022/051) and was supported
by MCIN with funding from European Union NextGenerationEU (PRTR-C17.I1) and
by GVA.
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