Abstract
A new europium compound [Eu2(H2O)8(MBA−)4](2MBA−) (1; MBA− = methylsulfanyl-benzoic acid anion) was synthesized via an in situ reaction of EuCl3·6H2O, 4,4′,4″-(1,3,5-triazine-2,4,6-triyltrisulfanediyl)tribenzoic acid, methanol and distilled water under hydrothermal conditions. The crystal structure is characterized by single-crystal X-ray diffraction and features a binuclear structure. The molecules are interlinked via hydrogen-bonding interactions to form a one-dimensional (1-D) supramolecular chain. A photoluminescence measurement with solid-state samples reveals that compound 1 can emit brown upconversion photoluminescence with the maximum peak locating at 622 nm and a weaker one at 590 nm. The bands are ascribed to the characteristic emission of the 4f electron intrashell transition of the 5D0 → 7F1 and 5D0 → 7F2 of the Eu3+ ions. Compound 1 exhibits CIE chromaticity coordinates (0.557, 0.4292) and its CCT is 1871 K. The solid-state diffuse reflectance spectra reveals that compound 1 has a bandgap of 4.09 eV.
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