Solvent free mechanochemical synthesis of Eu³⁺ complex and its luminescent sensing of trace water and temperature

Abstract

A solid state Eu(iii) complex was synthesized by a mechanochemical method and used for luminescent sensing of trace water and temperature.

Enhanced Near-IR Luminescence and Thermal-Resistant Properties of Yb(III) Complexes Under Solvent-Free Mechanochemical Conditions

“…Evidence for the presence of water molecules of Yb­(tta) 3 ·3H 2 O is provided by the absorption band at 3420 cm –1 in Figure b. Bands from 1602 to 1567 cm –1 of the L 1 in Figure a are attributed to the asymmetric stretching of CN, which indicates the terpyridine rings of L 1 . The absorption band at 1606 cm –1 Yb­(tta) 3 ·3H 2 O is attributed to the stretching vibration of CO in the tta moiety and then shifts to 1614 cm –1 in Yb­(tta) 3 · L 1 .…”

“…Due to the rich coordination chemistry and generally high binding affinity toward Yb 3+ , terpyridine ligands have received much attention in coordination chemistry and materials science . Yet, terpyridines, particularly symmetrical terpyridines, have rarely been used to prepare efficient NIR luminescent materials due to their low solubility in solvents . In this regard, the development of solvent-minimized or solvent-free techniques is highly desirable for material synthesis and remains challenging.…”

“…30 Yet, terpyridines, particularly symmetrical terpyridines, have rarely been used to prepare efficient NIR luminescent materials due to their low solubility in solvents. 31 In this regard, the development of solvent-minimized or solvent-free techniques is highly desirable for material synthesis and remains challenging. Mechanochemical synthesis has a long history since 1887, 32 and has become more and more important because of its remarkable advantages, such as shorter reaction times, the avoidance of hazardous or undesirable solvents, simpler operational handling, and even its applicability to substrates that are insoluble in common organic solvents.…”

Highly sensitive and precise optical temperature sensors based on new luminescent Tb3+/Eu3+ tetrakis complexes with imidazolic counterions

“…This thermometric feature has enormous disadvantages as the thermometric parameter is compromised by (i) variations in the sensor concentration, (ii) optoelectronic drifts in the excitation source and detecting system, and (iii) material homogeneity effects. [13][14][15] Such disadvantages were overcome with the use of ratiometric probes, which use the ratio between two transitions or two spectral regions and, consequently, are selfcalibrating. 16,17 It is worth mentioning that several other emission parameters were used as the thermometric parameter (e.g., bandwidth and lifetimes).…”

Luminescent Europium Complex‐Grafted Octenyl Succinylated Starch Nanoparticles

“…[4][5][6] Among the various fluorescent probes available, lanthanide complexes have attracted extensive interest due to their high luminescence quantum yields, large Stokes shifts, narrow bandwidths, long lifetimes, and intrinsic protection against photobleaching. [7][8][9][10] In particular, europium (Eu) complexes are undoubtedly one of the most important. They have excellent luminescence properties owing to the antenna effect of ligands and the f-f electron transitions of Eu 3+ ions.…”