Two-Dimensional Layered Metal–Organic Frameworks of Lanthanum(iii) Pyridine-2,6-dicarboxylate

Yong-Ru Liu; Tao Yang; Lei Li; Jun-Min Liu; Cheng-Yong Su

doi:10.1071/CH09002

RESEARCH ARTICLE

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Two-Dimensional Layered Metal–Organic Frameworks of Lanthanum(iii) Pyridine-2,6-dicarboxylate

Yong-Ru Liu ^A , Tao Yang ^A , Lei Li ^A , Jun-Min Liu ^A and Cheng-Yong Su ^A ^B ^C

+ Author Affiliations

- Author Affiliations

^A MOE Laboratory of Bioinorganic and Synthetic Chemistry, State Key Laboratory of Optoelectronic Materials and Technologies, School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275, China.

^B State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China.

^C Corresponding author. Email: cesscy@mail.sysu.edu.cn

Australian Journal of Chemistry 62(12) 1667-1674 https://doi.org/10.1071/CH09002
Submitted: 3 January 2009 Accepted: 13 May 2009 Published: 10 December 2009

Abstract

Three two-dimensional (2D) La^III metal–organic frameworks, {[La₄(pda)₆(H₂O)₈]·2H₂O} _n (1), {[La₂(pda)₃(H₂O)₄]·H₂O} _n (2), and {[La₂(pda)₂(H₂O)₅SO₄]·2H₂O} _n (3) (pda = pyridine-2,6-dicarboxylate), have been synthesized under hydro(solvo)thermal conditions and characterized by means of X-ray single-crystal diffraction, X-ray powder diffraction, and IR spectroscopy. Complexes 1 and 2 crystallize in the same triclinic system of a P-1 space group, share the same composition, and 4·8² net topology, but have a different local coordination environment and symmetry for the La^III ions, thus they form a pair of supramolecular isomers. Complex 3 contains two kinds of crystallographically independent La^III ions and bis-chelating SO₄ ^2– anions, to generate a 2D grid structure of (4, 4) topology. All three complexes display layered crystal packing in the crystal lattice. The thermogravimetric analyses indicate that the solvated and coordinated water molecules in all complexes can be removed upon heating, and the frameworks decompose above 400°C.

Acknowledgements

This work was supported by the NSF for Distinguished Young Scholars of China (Grant 20525310), 973 Program of China (Grant 2007CB815302), the NSF of China (Grants 20673147, 20773167, 20731005), and RFDP of Higher Education.

References

Two-Dimensional Layered Metal–Organic Frameworks of Lanthanum(iii) Pyridine-2,6-dicarboxylate

Abstract

Acknowledgements

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