Kojima Daichi, Sanada Tomoe, Wada Noriyuki, Kojima Kazuo
Department of Applied Chemistry, College of Life Sciences, Ritsumeikan University 1-1-1 Noji-Higashi Kusatsu-City Shiga 525-8577 Japan
Department of Materials Science and Engineering, National Institute of Technology, Suzuka College Shiroko-Cho Suzuka-City Mie 510-0294 Japan.
RSC Adv. 2018 Sep 10;8(55):31588-31593. doi: 10.1039/c8ra06043f. eCollection 2018 Sep 5.
The solvothermal reaction of a mixture of calcium acetylacetonate and 1,4-naphthalenedicarboxylic acid (HNDC) in a solution containing ethanol and distilled water gave rise to a metal-organic framework (MOF), {(HO)[Ca(NDC)(CHO)(OH)]}·1.1HO. This MOF possesses a new structure composed of calcium clusters and HNDC linker anions and shows a unique fluorescence property; it exhibits a fluorescence peak at 395 nm ( = 350 nm) at room temperature, which is blue-shifted compared with that exhibited by the free HNDC 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.
乙酰丙酮钙与1,4-萘二甲酸（HNDC）的混合物在含有乙醇和蒸馏水的溶液中进行溶剂热反应，生成了一种金属有机框架（MOF），即{(HO)[Ca(NDC)(CHO)(OH)]}·1.1HO。这种MOF具有由钙簇和HNDC连接体阴离子组成的新结构，并表现出独特的荧光特性；它在室温下于395 nm（λex = 350 nm）处呈现一个荧光峰，与游离的HNDC配体所呈现的荧光峰相比发生了蓝移。这种荧光的一种可能机制可能归因于配体到金属的电荷转移（LMCT）跃迁，并且是基于钙的MOF因LMCT而呈现蓝移荧光的首个实例。
