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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Investigations of the spectral properties of lanthanide(III) complexes with 3,3'-bi-isoquinoline-2,2'-dioxide (biqO_2) and biqO_2-cryptate in solution, solids, and gels
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Investigations of the spectral properties of lanthanide(III) complexes with 3,3'-bi-isoquinoline-2,2'-dioxide (biqO_2) and biqO_2-cryptate in solution, solids, and gels

机译：镧系元素（III）与3,3'-bi-isoquinoline-2,2'-dioxide（biqO_2）和biqO_2-cryptate在溶液，固体和凝胶中的配合物的光谱性质研究

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摘要

Increasing interest has been observed in thespectroscopic properties of lanthanide ions in cryptates andheteroaromatic ligands where the lanthanide ions are encapsulatedinto the ligand structure (B. Alphov, J.M. Lehn, G. Matkis, Angen.Chem. 99 (1987) 259; J.M. Lehn, in: V Balzani (Ed.),Supramolecular Photochemistry, Reidel, Dordrecht, 1987, pp.29-42; N. Sabbatini, S. Perathoner, V Balzani, B. Alpha, J.M. Lehn, in:V Balzani (Ed.), Supramolecular Photochemistry, Reidel,Dordrecht, 1987, pp.187-206). Of special interest are thosecryptates and chelating ligands in which efficient energy transferbetween the ligands and the rare-earth ion takes place. The goal ofthe present studies is the description of the best conditions for thisintra-system energy transfer in two types of compounds with 3,3'-biisoquinoline-2,2'-dioxide (biqO_2), and for a cryptateincorporating biqO_2. Results are reported for these complexesprepared in water and non-aqueous solutions, and in gels obtainedby different methods. Spectroscopic methods, including absorption,emission and excitation spectra, at 293 and 77 K were used tocharacterize the type and symmetry of the complexes formed insolutions and gels under different conditions (pH andconcentration). It is demonstrated that the type of solvent used inthe sol-gel process affects the emission intensity throughperturbation of the ligand: metal electronic energy levels, and thesymmetry and stability of the complexes. Correlation of the solidstate spectroscopic results with those in solution and gel for Eu(III)ions, illustrates the role of the energy back transfer process inemission quenching. This is found to be temperature dependent.
机译：在镧系元素被封装到配体结构中的隐窝和杂芳族配体中，人们对镧系元素的光谱学特性越来越感兴趣（B. Alphov，JM Lehn，G. Matkis，Angen.Chem。99（1987）259; JM Lehn，in ：V Balzani（Ed。），超分子光化学，Reidel，Dordrecht，1987，第29-42页; N。Sabbatini，S。Perathoner，V Balzani，B。Alpha，JM Lehn，in：V Balzani（Ed。），超分子光化学，Reidel，Dordrecht，1987，pp.187-206）。特别令人感兴趣的是那些在配体和稀土离子之间发生有效能量转移的加密和螯合配体。本研究的目的是描述在两种类型的具有3,3'-二异喹啉-2,2'-二氧化物（biqO_2）的化合物中进行系统内能量转移的最佳条件，以及对结合有biqO_2的加密物的最佳条件。报告了在水和非水溶液中以及通过不同方法获得的凝胶中制备的这些配合物的结果。采用光谱方法，包括在293和77 K下的吸收，发射和激发光谱，表征了在不同条件（pH和浓度）下溶液和凝胶形成的配合物的类型和对称性。结果表明，溶胶-凝胶过程中所用的溶剂类型会通过扰动配体：金属电子能级以及配合物的对称性和稳定性而影响发射强度。固态光谱结果与溶液和凝胶中Eu（III）离子的相关性说明了能量回传过程非发光猝灭的作用。发现这与温度有关。

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