Abstract
Two europium(III) coordination polymers (CPs), namely, poly[[diaquabis(μ4-1H-benzimidazole-5,6-dicarboxylato-κ6
N
3:O
5,O
5′:O
5,O
6:O
6′)(μ2-oxalato-κ4
O
1,O
2:O
1′,O
2′)dieuropium(III)] dihydrate], {[Eu2(C9H4N2O4)2(C2O4)(H2O)2]·2H2O}
n
(1), and poly[(μ3-1H-benzimidazol-3-ium-5,6-dicarboxylato-κ5
O
5:O
5′,O
6:O
6,O
6′)(μ3-sulfato-κ3
O:O′:O′′)europium(III)], [Eu(C9H5N2O4)(SO4)]
n
(2), have been synthesized via the hydrothermal method and structurally characterized. CP 1 shows a three-dimensional network, in which the oxalate ligand acts as a pillar, while CP 2 has a two-dimensional network based on a europium(III)–sulfate skeleton, further extended into a three-dimensional framework by hydrogen-bonding interactions. The structural diversity in the two compounds can be attributed to the different acidification abilities and geometries of the anionic ligands. The luminescence properties of 1 display the characteristic europium red emission with CIE chromaticity coordinates (2/3, 0.34). Interestingly, CP 2 shows the characteristic red emission with CIE chromaticity coordinates (0.60, 0.34) when excited at 280 nm and a near-white emission with CIE chromaticity coordinates (0.38, 0.29) when excited at 340 nm.
Funder
Fujian Key Laboratory of Functional Marine Sensing Materials, Minjiang University
Publisher
International Union of Crystallography (IUCr)
Subject
Materials Chemistry,Inorganic Chemistry,Physical and Theoretical Chemistry,Condensed Matter Physics