Manganese(ii) Complexes with a Bulky Anthracene-Based Dicarboxylic Ligand: Syntheses, Crystal Structures, and Magnetic Properties

Chun-Sen Liu; E. Carolina Sañudo; Jun-Jie Wang; Ze Chang; Li-Fen Yan; Xian-He Bu

doi:10.1071/CH08014

RESEARCH ARTICLE

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Manganese(ii) Complexes with a Bulky Anthracene-Based Dicarboxylic Ligand: Syntheses, Crystal Structures, and Magnetic Properties

Chun-Sen Liu ^A ^B ^D , E. Carolina Sañudo ^C , Jun-Jie Wang ^A , Ze Chang ^A , Li-Fen Yan ^A and Xian-He Bu ^A ^D

+ Author Affiliations

- Author Affiliations

^A Department of Chemistry, Nankai University, Tianjin 300071, China.

^B Zhengzhou University of Light Industry, Henan Provincial Key Laboratory of Surface & Interface Science, Zhengzhou, Henan 450002, China.

^C Departament de Química Inorgànica, Universitat de Barcelona, Diagona, 647, 08028 Barcelona, Spain.

^D Corresponding authors. Email: buxh@nankai.edu.cn; chunsenliu@zzuli.edu.cn

Australian Journal of Chemistry 61(5) 382-390 https://doi.org/10.1071/CH08014
Submitted: 14 January 2008 Accepted: 1 April 2008 Published: 22 May 2008

Abstract

To investigate the influence of the bulky aromatic ring skeleton with a large conjugated π-system on the structures and properties of its complexes, two Mn^II complexes with the anthracene-based dicarboxylic ligand anthracene-9,10-dicarboxylic acid (H₂L) and different 2,2′-bipyridyl-like chelating ligands were synthesized and characterized: {[Mn₂(L)₂(bipy)₂(H₂O)₂]}_∞ (1) and {[Mn(L)(phen)₂](H₂O)_2.5}_∞ (2) (L = anthracene-9,10-dicarboxylate, bipy = 2,2′-bipyridine, and phen = 1,10-phenanthroline). Complex 1 has a (4,4) two-dimensional (2D) sheet structure that is further assembled to form a three-dimensional (3D) supramolecular network by the co-effects of C–H···π and O–H···O hydrogen-bonding interactions. Complex 2 adopts a one-dimensional (1D) polymeric chain structure by using the chelating phen instead of bipy in 1, which is further interlinked by interchain C–H···π interactions, which results in a higher-dimensional supramolecular network from the different crystallographic directions. The relevant results reveal that the steric bulk of the anthracene ring in H₂L may play an important role in the formation of 1 and 2. Moreover, the magnetic properties of 1 and 2 show that the long Mn···Mn intermetallic separations result in weak magnetic coupling, along with the corresponding coupling constant J parameters related to their structural characteristics, –0.35 cm^–1 for 1 and –3.0 cm^–1 for 2.

Acknowledgements

This work was supported by the National Natural Science Funds of China (Nos. 50673043 and 20531040), the Natural Science Fund of Tianjin, China (no. 07JCZDJC00500), the Spanish government (Grant CTQ2006/03949/BQU and Juan de la Cierva Fellowship to E. Carolina Sañudo), and the Startup Fund for PhDs in Natural Scientific Research of Zhengzhou University of Light Industry (2007BSJJ001 to Chun-Sen Liu).

References

Manganese(ii) Complexes with a Bulky Anthracene-Based Dicarboxylic Ligand: Syntheses, Crystal Structures, and Magnetic Properties

Abstract

Acknowledgements

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