Ratiometric luminescence behavior of lanthanide-mixed benzenedicarboxylates frameworks

Hetero-hexalanthanide Complexes: A New Synthetic Strategy for Molecular Thermometric Probes

“…Because of the unique optical properties of lanthanide ions (sharp emission peaks, high color purity, and long luminescence lifetimes), lanthanide-based coordination compounds (coordination polymers or complexes) have attracted great attention over the past decades. Indeed, they could find their application in various technological fields, , such as display and lighting, − imaging, , the fight against counterfeiting, − or molecular thermometry. − Some of these potential applications, such as ratiometric molecular thermometry or materials vintage, require heteropoly lanthanide compounds. − Numerous lanthanide-based coordination polymers have been reported to date, − but examples of coordination polymers with heteropoly lanthanide complexes as metallic centers are still quite scarce, − and examples of heterolanthanide complexes that can be isolated and used as molecular precursors are even rarer . Indeed, most often, heteropoly lanthanide complexes are obtained via one-pot synthesis from simple rare-earth salts or oxides. − For more than a decade, our group is working on hexanuclear complexes with general chemical formula [Ln 6 (μ 6 -O)­(μ 3 -OH) 8 (NO 3 ) 6 (H 2 O) 12 ]·2NO 3 ·2H 2 O, where Ln = Sm–Lu and Y (hereafter symbolized by [Ln 6 ]) , (see Figure ).…”

Microcrystalline Core–Shell Lanthanide-Based Coordination Polymers for Unprecedented Luminescent Properties

“…They have been assumed to be isostructural to [Tb 2 (bdc) 3 (H 2 O) 4 ] ∞ on the basis of their powder X-ray diffraction patterns (Figure S5). This series of isostructural compounds has been chosen because its 3D crystal structure (Figure ) is very compact and stable and because luminescent properties of molecular alloys based on terephthalate have been extensively studied. − …”

“…This series of isostructural compounds has been chosen because its 3D crystal structure ( Figure 10) is very compact and stable 67 and because luminescent properties of molecular alloys based on terephthalate have been extensively studied. [68][69][70][71][72][73][74][75][76] Emission spectra as well as luminescence lifetimes of Eu 3+ and Tb 3+ ions have been measured for both compounds at room-temperature ( Figure 11 Additionally, luminance has been measured for both samples ( Figure S6). Core-shell sample luminance is 90(1) cd.m -2 while that of the molecular alloy sample is only 22(1) cd.m -2 .…”