New metal-organic frameworks of [M(C{sub 6}H{sub 5}O{sub 7})(C{sub 6}H{sub 6}O{sub 7})(C{sub 6}H{sub 7}O{sub 7})(H{sub 2}O)] . H{sub 2}O (M=La, Ce) and [Ce{sub 2}(C{sub 2}O{sub 4})(C{sub 6}H{sub 6}O{sub 7}){sub 2}] . 4H{sub 2}O

Journal Article · Sun Apr 15 00:00:00 EDT 2012 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/J.JSSC.2012.01.046· OSTI ID:22012092

Shengfeng, Weng; Wang, Yun-Hsin ^[1]; Lee, Chi-Shen ^[1]

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1. Department of Applied Chemistry, National Chiao Tung University, 1001 University Rd., Hsinchu 30010, Taiwan (China)

Two novel materials, [M(C{sub 6}H{sub 5}O{sub 7})(C{sub 6}H{sub 6}O{sub 7})(C{sub 6}H{sub 7}O{sub 7})(H{sub 2}O)] . H{sub 2}O (M=La(1a), Ce(1b)) and [Ce{sub 2}(C{sub 2}O{sub 4})(C{sub 6}H{sub 6}O{sub 7}){sub 2}] . 4H{sub 2}O (2), with a metal-organic framework (MOF) were prepared with hydrothermal reactions and characterized with photoluminescence, magnetic susceptibility, thermogravimetric analysis and X-ray powder diffraction in situ. The crystal structures were determined by single-crystal X-ray diffraction. Compound 1 crystallized in triclinic space group P1-bar (No. 2); compound 2 crystallized in monoclinic space group P2{sub 1}/c (No. 14). The structure of 1 is built from a 1D MOF, composed of deprotonated citric ligands of three kinds. Compound 2 contains a 2D MOF structure consisting of citrate and oxalate ligands; the oxalate ligand arose from the decomposition in situ of citric acid in the presence of Cu{sup II} ions. Photoluminescence spectra of compounds 1b and 2 revealed transitions between the 5d{sup 1} excited state and two levels of the 4f{sup 1} ground state ({sup 2}F{sub 5/2} and {sup 2}F{sub 7/2}). Compounds 1b and 2 containing Ce{sup III} ion exhibit a paramagnetic property with weak antiferromagnetic interactions between the two adjacent magnetic centers. - Graphical Abstract: [M(C{sub 6}H{sub 5}O{sub 7})(C{sub 6}H{sub 6}O{sub 7})(C{sub 6}H{sub 7}O{sub 7})(H{sub 2}O)] . H{sub 2}O (M=La(1a), Ce(1b)) and [Ce{sub 2}(C{sub 2}O{sub 4})(C{sub 6}H{sub 6}O{sub 7}){sub 2}] . 4H{sub 2}O (2)-with 1D and 2D structures were synthesized and characterized. Highlights: Black-Right-Pointing-Pointer Two MOF - [M(C{sub 6}H{sub 5}O{sub 7})(C{sub 6}H{sub 6}O{sub 7})(C{sub 6}H{sub 7}O{sub 7})(H{sub 2}O)] . H{sub 2}O (M=La(1a), Ce(1b)) and [Ce{sub 2}(C{sub 2}O{sub 4})(C{sub 6}H{sub 6}O{sub 7}){sub 2}] . 4H{sub 2}O (2) - with 1D and 2D structures. Black-Right-Pointing-Pointer The adjacent chains of the 1D framework were correlated with each other through an oxalate ligand to form a 2D layer structure. Black-Right-Pointing-Pointer The source of the oxalate ligand was the decomposition in situ of citric acid oxidized in the presence of Cu{sup II} ions.

• OSTI ID: 22012092
• Journal Information: Journal of Solid State Chemistry, Vol. . 188; Other Information: Copyright (c) 2012 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ANTIFERROMAGNETISM
CITRIC ACID
COPPER
DECOMPOSITION
EXCITED STATES
GROUND STATES
HYDROTHERMAL SYNTHESIS
INTERACTIONS
LIGANDS
MAGNETIC SUSCEPTIBILITY
MONOCLINIC LATTICES
MONOCRYSTALS
OXALATES
PARAMAGNETISM
PHOTOLUMINESCENCE
RARE EARTHS
SPACE GROUPS
THERMAL GRAVIMETRIC ANALYSIS
WATER
X-RAY DIFFRACTION