Synthesis, structure, and fluorescence properties of a calcium-based metal-organic frameworkCCDC 1813621. For crystallographic data in CIF or other electronic format see DOI: 10.1039/c8ra06043f

• Main Authors: Kojima, Daichi, Sanada, Tomoe, Wada, Noriyuki, Kojima, Kazuo
• Format: Journal Article
• Language: English
• Published: 10.09.2018
• ISSN: 2046-2069
• DOI: 10.1039/c8ra06043f

The solvothermal reaction of a mixture of calcium acetylacetonate and 1,4-naphthalenedicarboxylic acid (H 2 NDC) in a solution containing ethanol and distilled water gave rise to a metal-organic framework (MOF), {(H 3 O + ) 2 [Ca(NDC)(C 2 H 5 O)(OH)]} 4 ·1.1H 2 O. This MOF possesses a new structure composed of calcium clusters and H 2 NDC linker anions and shows a unique fluorescence property; it exhibits a fluorescence peak at 395 nm ( λ ex = 350 nm) at room temperature, which is blue-shifted compared with that exhibited by the free H 2 NDC ligand. One of the possible mechanisms for this fluorescence is likely attributable to a ligand-to-metal charge transfer (LMCT) transition and is the first example of a calcium-based MOF exhibiting blue-shifted fluorescence due to LMCT. The solvothermal reaction of a mixture of calcium acetylacetonate and 1,4-naphthalenedicarboxylic acid (H 2 NDC) in a solution containing ethanol and distilled water gave rise to a metal-organic framework (MOF), {(H 3 O + ) 2 [Ca(NDC)(C 2 H 5 O)(OH)]} 4 ·1.1H 2 O.