Similarities of Coordination Polymer and Dimeric Complex of Europium(III) with Joint and Separate Terpyridine and Benzoate

Abstract

A dimeric complex of trivalent europium [Eu2Cl4(bc)2(ptpy)2] (1), containing the separate ligands 4'‐phenyl‐2,2':6',2''‐terpyridine (ptpy) and benzoate (bc–) and a one‐dimensional double strand coordination polymer of the composition 1∞[EuCl2(cptpy)] (2) with 4‐[2,2':6',2''‐terpyridin]‐4'‐yl‐benzoate (cptpy–) were obtained. The products exhibit structural similarities despite the character of joint and separate functionality of the ligands. The dimer 1 shows photoluminescence with high quantum yield [61(2) %]. Eu3+ emission lifetime is 1.493(1) ms at room temperature and rises to 1.649(1) ms upon cooling to 77 K.

S-Heptazine N-ligand based luminescent coordination materials: synthesis, structural and luminescent studies of lanthanide–cyamelurate networks

“…9, right), and are consistent with the literature. Indeed, the emission lifetimes are occasionally reported to be > 1.0 ms for other Eu 3+ - and Tb 3+ -containing coordination polymers, 86,87 but values of several hundred μs are generally encountered. 88–91…”

“…9, right), and are consistent with the literature. Indeed, the emission lifetimes are occasionally reported to be > 1.0 ms for other Eu 3+ -and Tb 3+containing coordination polymers, 86,87 but values of several hundred µs are generally encountered. [88][89][90][91] The absorption, excitation and emission spectra and the emission decays of the Dy-Cy and Er-Cy networks at 298 and 77 K are shown in Fig.…”

Rapid Spectrometer-Free Luminescence-Based Detection of Tb3+ and Eu3+ in Aqueous Solution for Recovery and Urban Mining

“…It was found that the sum concentration of trivalent lanthanides influences the retardation factor of individual Ln 3+ complexes formed (SI Figure S20). As trivalent lanthanides can form coordination compounds with different Ln 3+ :terpyridine ratios from 2:1 to 1:3, − different species can be also formed during a TLC process. At a higher amount of Eu 3+ /Tb 3+ applied on the plate, the retardation factor of formed highly luminescent species is close to 1.…”

“…Moreover, ptpy can be easily obtained on a gram scale at room temperature, it is water-stable, thermally stable, and stable vs air . Although terpyridine derivatives are known for decades to form highly luminescent coordination compounds with Eu 3+ and Tb 3+ , − they were neither considered in detection schemes of trivalent lanthanides, nor for recovery concepts, until now. Combined with the typically intense and characteristic Eu 3+ and Tb 3+ luminescence in the visible region, it is possible to detect these ions in the aqueous solution “on the fly” within parts of a second, without the use of a spectrophotometer.…”

Phosphorescence Afterglow and Thermal Properties of [ScCl3(ptpy)] (ptpy: 4'‐phenyl‐2,2',6',2''‐terpyridine)

“…For comparison, Eu 3+ complexes with ptpy [EuCl 3 (ptpy)(L)] (L=pyridine, acetamide) and [Eu 2 Cl 6 (ptpy) 2 (4,4’‐bipy)] ⋅ 4,4’‐bipy first release co‐coordinated organic molecules (L or 4,4’‐bipy) at 250–295 °C, with the resulting residue EuCl 3 (ptpy) being stable up to 435–445 °C [47] . In the another example, [Eu 2 Cl 4 (bc) 2 (ptpy) 2 ] is stable up to 395 °C, where a carboxylate group is responsible for the start of the decomposition [48] . As can be seen, [ScCl 3 (ptpy)] has a higher thermal stability than the Eu 3+ complexes with ptpy.…”