Abstract
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.
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This work was supported by the National Natural Science Foundation of China (61136003, 61575096, 51173081), the Ministry of Education of China (IRT1148), the Natural Science Foundation of Jiangsu Province (BM2012010, BK20151512), Priority Academic Program Development of Jiangsu Higher Education Institutions (YX03001), Specialized Research Fund for the Doctoral Program of Higher Education (20113223110005), and the National Basic Research Program of China (2012CB933301).
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Zhou, X., Chen, Q., Li, L. et al. Three alkaline earth metal-organic frameworks based on fluorene-containing carboxylates: syntheses, structures and properties. Sci. China Chem. 60, 115–121 (2017). https://doi.org/10.1007/s11426-016-0291-3
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DOI: https://doi.org/10.1007/s11426-016-0291-3