Lanthanide contraction effect and white-emitting luminescence in a series of metal–organic frameworks based on 2,5-pyrazinedicarboxylic acid

Abstract

Influence of the lanthanide contraction effect on the formation of a series of new MOFs and their wide colour range luminescence spectra.

Crystal Structures, Thermal and Luminescent Properties of Gadolinium(III) Trans-1,4-cyclohexanedicarboxylate Metal-Organic Frameworks

“…430 • C. The TG profile of 4 is close to 3 and includes solvent loss at ca. 130 • C and two steps of the lattice decomposition occurring in the range 320-410 • C and above 490 • C. In summary, thermal stability characteristics of the coordination framework in 1-4 are high [38][39][40][41] and quite similar to each other. However, their stability is limited by the evaporation of the neutral N-donor chelate, occurring below 400 • C.…”

Cinnamal Sensing and Luminescence Color Tuning in a Series of Rare-Earth Metal−Organic Frameworks with Trans-1,4-cyclohexanedicarboxylate

“…Instead, the photoexcitation is released through a phen-centered π*→π transition, which is usually not very effective, as a great deal of the energy is released through a nonemitting relaxation along multiple vibrational states of the antenna ligand. Keeping in mind that the compounds 1-3 are completely isostructural, the coordination matrix 1 with low luminescence activity can be employed for the dilution of photoactive Eu 3+ and/or Tb 3+ cations in the homogeneous crystalline phase [52][53][54][55][56][57]. Such lanthanide doping of the yttrium framework could (i) improve the luminescence efficiency by reducing the concentration quenching known for such luminophores (Eu 3+ , Tb 3+ ) and (ii) allow the mixing of the luminescence colors for more complex optical properties.…”

Intensity and lifetime ratiometric luminescent thermometer based on a Tb(iii) coordination polymer

“…3 Specifically, terbium(III) holds special significance in optical applications because of its strong phosphorescence within the visible region, emitting a green color under the irradiation of a UV lamp. 15 Furthermore, to obtain lanthanide coordination polymers (Ln-CPs), aromatic ligands that tend to enhance the brightness of the lanthanide cation are of particular interest such as the polycarboxylic derivatives 1,2,4,5-tetrakis(4′-carboxyphenyl)-benzene (H 4 bttb) 16,17 and 2,5-pyrazinedicarboxylic acid (H 2 -2,5pzdc) [18][19][20][21][22] that can undergo partial or complete deprotonation (see Table S1, in the ESI †). Moreover, as far as we know, there is no research report in the literature concerning the two polycarboxylic acids in the same reactional system and their coordination behavior with Ln III centers.…”