Luminescent Lanthanide Complexes with 1,2-Bis(ethylsulfinyl)ethane: Structural Dependences on Reacting Solvent, Ratio, and Co-Ligand

Jian-Rong Li; Ruo-Hua Zhang; Xian-He Bu

doi:10.1071/CH07279

RESEARCH ARTICLE

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Luminescent Lanthanide Complexes with 1,2-Bis(ethylsulfinyl)ethane: Structural Dependences on Reacting Solvent, Ratio, and Co-Ligand

Jian-Rong Li ^A , Ruo-Hua Zhang ^A and Xian-He Bu ^A ^B

+ Author Affiliations

- Author Affiliations

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

^B Corresponding author. Email: buxh@nankai.edu.cn

Australian Journal of Chemistry 61(2) 115-121 https://doi.org/10.1071/CH07279
Submitted: 6 August 2007 Accepted: 29 November 2007 Published: 11 February 2008

Abstract

The present paper reports our sequential efforts to investigate the structures and properties of flexible disulfoxide–lanthanide complexes. Combining our reported results, on the basis of changing synthesis conditions and using a co-ligand, six new complexes, [Ln(meso-L)₄](ClO₄)₃(H₂O) _n (n = 0.5, Ln = Eu (1), Gd (2); n = 0, Ln = Tb (3)) and [Ln(meso-L)₂(phen)₂](ClO₄)₃(CHCl₃)₂ (Ln = Eu (4), Gd (5), and Tb (6)) (herein, L = 1,2-bis(ethylsulfinyl)ethane, phen = 1,10-phenanthroline) were synthesized, and their structures were characterized by IR spectroscopy, elemental analysis, and X-ray single-crystal diffraction. The dependence of the formation of 1–3 on the solvents used and reaction ratios in the preparation was confirmed. Complexes 1–3 are isomorphous ionic complexes, and the coordination cation is chiral and has a mononuclear structure, in which the Ln^III atom is eight-coordinated by four L ligands. Complexes 4–6 are also isomorphous mononuclear ionic complexes, and in each complex cation, the central Ln^III atom is eight-coordinated by two L ligands and two phen molecules. In 1–6, all the L ligands exhibit the meso configuration and bis-monodentate chelating coordination mode. Further, the absorption and luminescent spectra of L, phen and complexes 4–6 in solution were investigated at room temperature. The absorption spectra show that only a very slight shift of the absorption band occurred for the ligands L and phen when coordinating to metal ions, being consistent with their origin. The photoluminescence of 4 and 6 exhibits the usual metal-centred emission spectra arising from ligand-to-metal energy transfer and the emission of π → π* transitions from the phen ligand; the latter is also seen in the emission spectrum of 5.

Acknowledgements

The present work was supported by the National Natural Science Foundation of China (nos 5067304, 20531040, and 20773068) and the Natural Science Fund of Tianjin, China (no. 07JCZDJC00500).

References

Luminescent Lanthanide Complexes with 1,2-Bis(ethylsulfinyl)ethane: Structural Dependences on Reacting Solvent, Ratio, and Co-Ligand

Abstract

Acknowledgements

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