Calix[4]azacrowns as Novel Molecular Scaffolds for the Generation of Visible and Near-Infrared Lanthanide Luminescence

Luminescence enhancement by deuterium

Created literally at the dawn of time, deuterium has been extremely valuable in so many chemistry roles. The subject of this review focuses on one deuterium application in particular: its enhancement of luminescence in many substances. After providing general overviews of both deuterium and luminescence, the early exploration of deuterium's effect on luminescence is described, followed by a number of specific topics. These sections include a discussion of deuterium-influenced luminescence for dyes, proteins, singlet oxygen, and the lanthanide elements, as well as anomalous inverse deuterium luminescence effects. Future directions for this important research topic are also proposed, as well as a summary conclusion.

Combining the Best of Two Chelating Titans: A Hydroxypyridinone-Decorated Macrocyclic Ligand for Efficient and Concomitant Complexation and Sensitized Luminescence of f-Elements

An ideal chelator for f-elements features rapid kinetics of complexation, high thermodynamic stability, and slow kinetics of dissociation. Here we present the facile synthesis of a macrocyclic ligand bearing four 1-hydroxy-2-pyridinone units linked to a cyclen scaffold that rapidly forms thermodynamically stable complexes with lanthanides (Sm³⁺ , Eu³⁺ , Tb³⁺ , Dy³⁺ ) and a representative late actinide (Cm³⁺ ) in aqueous media and concurrently sensitizes them. Extended X-ray absorption fine structure (EXAFS) spectroscopy revealed an increase in the Ln/An-O bond lengths following the trend Cm>Eu>Tb and EXAFS data were compatible with time-resolved luminescence studies, which indicated one to two water molecules in the inner metal coordination sphere of Eu(III) and two water molecules for the Cm(III) complex. Spectrofluorimetric ligand competition titrations against DTPA confirmed the high thermodynamic stability of DOTHOPO complexes, with pM values between 19.9(1) and 21.9(2).

Magnetic, luminescence, topological and theoretical studies of structurally diverse supramolecular lanthanide coordination polymers with flexible glutaric acid as a linker

This contribution explores the topological, supramolecular, magnetic and luminescent properties of previously unknown CPs, which fall into category of glutarates without auxiliary coligands.

N-Alkyl calix[4]azacrowns for the selective extraction of uranium

Novel N-substituted calix[4]azacrown extractants display selective extraction properties in regards to uranium from sulfuric acid solution.

Multi-component luminescent lanthanide hybrids of both functionalized IRMOF-3 and SBA-15

Both metal organic frameworks (IRMOF-3) and SBA-15 have been used to assemble novel photofunctional multi-component lanthanide hybrid materials, whose luminescent color can be tuned by adjusting the composition.

Color-tunable and white-light emission of one-dimensional l-di-2-thenoyltartaric acid mixed-lanthanide coordination polymers

l-Di-2-thenoyltartaric acid mix-lanthanide coordination polymers with one-dimensional ladder-like chain structures present color-tunable and white-light emission upon varying the excitation wavelength.

Lanthanide coordination polymers constructed from 5-(1H-tetrazol-5-yl)isophthalic acid ligand: white light emission and color tuning

A series of lanthanide coordination polymers (LnCPs), namely [Ln(TZI) (H₂O)₅]_n(1–5) [Ln = Nd (1), Eu (2), Gd (3), Tb (4) and Sm (5)], were synthesized through the self-assembly of 5-(1H-tetrazol-5-yl)isophthalic acid (H₃TZI) ligand and lanthanide ions.

Towards full-color-tunable emission of two component Eu(iii)-doped Gd(iii) coordination frameworks by the variation of excitation light

Eu(iii)-doped Gd(iii) pyrazine-2,3,5,6-tetracarboxylate alkali–lanthanide metal–organic frameworks (LnMOF) with a unique (4¹¹·6⁸·8²)(4³·6²·8)(4³) topology present full color-tunable luminescence and white emission by the variation of excitation wavelengths.

Calix[4]bis(thiacrown): Assembly of an Endocyclic Disilver(I) Complex and Exocyclic 3D Copper(I) Coordination Polymers

Calix[4]bis(thiacrown-5) (L) with 1,3-alternating conformation was employed as a strong dinucleating ligand for the soft metal ions AgI and CuI. The reaction of L with AgPF6 afforded a discrete endo-coordinated disilver(I) complex 1, [Ag2L](PF6)2. In contrast, mixed products (2a + 2b) consisting of 3D networks were obtained from the reaction of L and CuI; 2b linked with a Cu4I4 cubane unit was shown to generate photoluminescence, while 2a linked with a Cu2I2 rhomboid unit does not.