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

Sheng Feng Weng, Yun Hsin Wang, Chi-Shen Lee*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

Two novel materials, [M(C 6H 5O 7)(C 6H 6O 7)(C 6H 7O 7)(H 2O)]. H 2O (M=La(1a), Ce(1b)) and [Ce 2(C 2O 4)(C 6H 6O 7) 2]. 4H 2O (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 (No. 2); compound 2 crystallized in monoclinic space group P2 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 II ions. Photoluminescence spectra of compounds 1b and 2 revealed transitions between the 5d 1 excited state and two levels of the 4f 1 ground state ( 2F 5/2 and 2F 7/2). Compounds 1b and 2 containing Ce III ion exhibit a paramagnetic property with weak antiferromagnetic interactions between the two adjacent magnetic centers.

Original languageEnglish
Pages (from-to)77-83
Number of pages7
JournalJournal of Solid State Chemistry
Volume188
DOIs
StatePublished - 1 Apr 2012

Keywords

  • Citric acid
  • Copper
  • Hydrothermal
  • Metal organic framework
  • Oxalate
  • Rare earth

Fingerprint Dive into the research topics of 'New metal-organic frameworks of [M(C <sub>6</sub>H <sub>5</sub>O <sub>7</sub>)(C <sub>6</sub>H <sub>6</sub>O <sub>7</sub>)(C <sub>6</sub>H <sub>7</sub>O <sub>7</sub>)(H <sub>2</sub>O)]. H <sub>2</sub>O (M=La, Ce) and [Ce <sub>2</sub>(C <sub>2</sub>O <sub>4</sub>)(C <sub>6</sub>H <sub>6</sub>O <sub>7</sub>) <sub>2</sub>]. 4H <sub>2</sub>O'. Together they form a unique fingerprint.

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