Preparation, spectroscopic properties of 1,4-di (N,N-diisopropylacetamido)-2,3(1H,4H)-quinoxalinedione (L) lanthanide complexes and the supramolecular structure of [Nd2L2(NO3)6(H2O)2]·H2O
| Autor: | Wei Dou, Yang Yu, Weisheng Liu, Jiang-Rong Zheng, Xue-Qin Song, Jun-Na Yao |
|---|---|
| Rok vydání: | 2007 |
| Předmět: |
Lanthanide
Stereochemistry Chemistry Hydrogen bond Ligand Supramolecular chemistry Infrared spectroscopy chemistry.chemical_element Crystal structure Condensed Matter Physics Electronic Optical and Magnetic Materials Inorganic Chemistry Crystallography X-ray crystallography Materials Chemistry Ceramics and Composites Physical and Theoretical Chemistry Europium |
| Zdroj: | Journal of Solid State Chemistry. 180:2616-2624 |
| ISSN: | 0022-4596 |
| DOI: | 10.1016/j.jssc.2007.06.034 |
| Popis: | The reaction of lanthanide nitrate with 1,4-di (N,N-diisopropylacetamido)-2,3(1H,4H)-quinoxalinedione (L) yields six novel Ln(III) complexes ([Ln(2)L(2)(NO3)(6)(H2O)(2)] center dot H2O) which are characterized by elemental analysis, thermogravimetric analysis (TGA), conductivity measurements, IR, electronic and H-1 NMR spectroscopies. A new quinoxalinedione-based ligand is used as antenna ligand to sensitize the emission of lanthanide cations. The lowest triplet state energy level of the ligand in the nitrate complex matches better to the resonance level of Eu(III) and Sm(III) than Tb(III) and Dy(III) ion. The f-f fluorescence is induced in the EU3+ and SM3+ complexes by exciting into the pi-pi* absorptions of the ligand in the UV. Furthermore, the crystal structures of a novel binuclear complex [Nd2L2(NO3)(6)(HO)(2)]center dot H2O has been determined by single-crystal X-ray diffraction. The binuclear [Nd2L2(NO3)(6)(H2O)(2)] center dot H2O Complex units are linked by the intermolecular hydrogen bonds and pi-pi interactions to form a two-dimensional (2-13) layer supramolecule. (c) 2007 Elsevier Inc. All rights reserved. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect