Photoluminescence Tuning and Water Detection of Yttrium Diazinedicarboxylate Materials through Lanthanide Doping

Abstract A series of yttrium(III)‐based compounds with three diazinedicarboxylate ligands, namely, {[Y 2 (μ‐pmdc) 2 (μ‐ox)(H 2 O) 6 ] · 4H 2 O} n ( 1 , pmdc = pyrimidine‐4,6‐dicarboxylato, ox = oxalato), {[Y 2 (μ‐pmdc) 3 (H 2 O) 6 ] · 2DMF · 8H 2 O} n ( 2 , DMF = N , N ‐dimethylformamide), {[Y 2 (μ 3 ‐pmdc) 2 (μ‐ox)(H 2 O) 4 ] · x H 2 O} n ( 3 , x ≈ 4.66), {[Y(μ 4 ‐pmdc)(NO 3 )(H 2 O)] · H 2 O} n ( 4 ), [Y 2 (μ‐pddc) 3 (H 2 O) 6 ] · 7H 2 O ( 5 , pddc = pyridazine‐3,6‐dicarboxylato) and {[Y 6 (μ 4 ‐pzdc) 6 (NO 3 )(H 2 O) 16 ](NO 3 ) 5 · 2H 2 O} n ( 6 , pzdc = pyrazine‐2,5‐dicarboxylato), have been prepared by different synthetic approaches. The crystal structures range from 0D to 3D architectures, and all of the compound show solvent‐occupied volumes. The thermal behaviour of these compounds has been analysed, and the open structure of 3 shows a reversible uptake/release of water. Moreover, the yttrium matrix of 3 has been doped with Eu 3+ and Tb 3+ ions to investigate the photoluminescence response of the hybrid materials. In addition to a tuneable emission colour through the concentration of luminescent ions and the excitation wavelength, these hybrid materials could serve as potential photofluorescent sensors for water detection through the reversible dehydration/rehydration process.