Three alkaline earth metal-organic frameworks based on fluorene-containing carboxylates: syntheses, structures and properties

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• 作者：Xinhui Zhou ; Qiang Chen ; Liang Li ; Tao Yang ; Jin Wang ; Wei Huang
• 关键词：metal ; organic frameworks (MOFs) ; coordination polymers ; alkaline earth ; fluorene
• 刊名：Science China Chemistry
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：60
• 期：1
• 页码：115-121
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry/Food Science, general;
• 出版者：Science China Press
• ISSN：1869-1870
• 卷排序：60

文摘

Three metal-organic frameworks, {[Mg₂(MFDA)₂(DMF)₃]·0.5H₂O}_n (1), {[Ca(MFDA)(DMF)(H₂O)]·0.5DMF}_n (2) and [Ca(MFDA)(DMF)₂]_n (3) (DMF=N,N-dimethylformamide) have been synthesized by the solvothermal reactions between the ligand 9,9-dimethylfluorene-2,7-dicarboxylic acid (H2MFDA) and the corresponding metal salts, respectively. The single crystal X-ray structural analyses reveal that compounds 1–3 display three-dimensional structures based on the M(II)–O–C chains. It is interesting that the MFDA ligands in 1–3 have different dihedral angles between the two carboxylate groups ranging from 9.9(1)° to 41.8(2)°. All of compounds exhibit strong ligand-centered blue emissions under UV lights. Their thermal properties have also been studied.