A Series of 3D Rare-Earth-Metal-Organic Frameworks with Isolated Guest Keggin Silicotungstate Fragments as Anion Templates

• Published in: European Journal of Inorganic Chemistry 2011-12, Vol.2011 (35), p.5397-5404
• Main Authors: Li, Suzhi, Zhang, Dongdi, Guo, Yuanyuan, Ma, Pengtao, Zhao, Junwei, Wang, Jingping, Niu, Jingyang
• Format: Article
• Language: English
• Subjects: Metal-organic frameworks; Photoluminescence; Polyoxometalates; Rare earths; Silicotungstate
• ISSN: 1434-1948; 1099-0682
• DOI: 10.1002/ejic.201100944

Six rare‐earth (RE) metal constructed 3D metal–organic frameworks, [RE(pydc)(H2O)n]4[SiW12O40]·4H2O [RE = TmIII (1), YIII (2), PrIII (3), LaIII (4), SmIII (5), EuIII (6); n = 3 (1, 2), 4 (3–6); H2pydc = pyridine‐2,6‐dicarboxylic acid], have been synthesized and characterized by elemental analyses, inductively coupled plasma techniques, IR and UV spectroscopy, thermogravimetric analyses (for 1 and 3), X‐ray powder diffraction, and single‐crystal X‐ray diffraction. The structural analyses indicate that 1–6 are basically isostructural and show a rare host 3D framework that contains [SiW12O40]4– Keggin polyoxoanions as templates. Photoluminescence measurements reveal that 1–5 show the luminescence of pydc ligands, whereas 6 displays a unique red luminescence. Six rare‐earth‐metal‐constructed 3Dmetal–organic frameworks have been synthesized. The structural analyses indicate that 1–6 are basically isostructural and show a rare host 3D framework that contains Keggin polyoxoanions [SiW12O40]4– as templates. The photoluminescence measurements reveal that 6 shows obvious red luminescence.