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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 >Efficient microwave synthesis of luminescent europium(III) complexes with polypyridine and the study of electrospectrochemistry
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Efficient microwave synthesis of luminescent europium(III) complexes with polypyridine and the study of electrospectrochemistry

机译：高效微波合成聚吡啶发光synthesis（III）配合物及电光谱研究

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We have developed an efficient synthetic method of photosensitive Eu(III)-polypyridine complexes, assisted with microwave irradiation. We succeeded in obtaining pure complexes in a shorter time with a 70 percent or more yield by reflux synthesis in ethyleneglycol under microwave irradiation and report their physicochemical properties.The results of the absorption spectra of the complexes in ethyleneglycol solution are obtained. All the Eu(III) complexes exhibit a very strong spectral absoiption at 397 and 664 run. These bands are attributed to intraligand IT -> n~* transition and n -> TT~* charge transfer transition. A general feature in the spectra of Eu(III) ion is a shift of absorption bands toward lower energy on complex formation. "Nephelauxetic effect;beta". We calculated the values of beta, b~(1/2) (measure of covalent), and 8 percent (Sinha's parameter) of Eu(III)-polypyridine complexes. The values of b~(l/2 )was in the ligand order: (pyre) > (tpy) > (bpyca)>(biq), (dmbpy) > (bpy). The fluorescent intensity of Eu(III) complex with bpyca ligand was strong enhanced by about 7.56 times when compared with that of Eu(III) ion, and for strong Eu(ffl) complex with tpy ligand it was enhanced by about 30 times. The dominant fluorescent transition of intramolecular energy transfer (IMET) process takes place from chelate absorption band state in Eu(III)-polypyridine to the J manifold of ~7F, which is a spin forbidden type and the role of the triplet state is enormously important.The formula of Nicolson-Shain was used for the analysis of an electrode reaction parameter. From the analytic results of C-V, the transfer coefficient (a), the diffusion coefficient (D, cm~2/s), the standard rate constants, k~°f(cm/s) of the electrode reaction for Eu(III) complexes with polypyridine were obtained. And the formation constants (Kf) were also discussed.
机译：我们已经开发了一种有效的光敏Eu（III）-聚吡啶配合物的合成方法，并辅以微波辐射。我们成功地在微波辐射下通过乙二醇的回流合成在较短的时间内以70％或更高的产率获得了纯络合物，并报告了其理化性质。获得了该络合物在乙二醇溶液中的吸收光谱结果。所有的Eu（III）配合物在397和664运行时均表现出非常强的光谱吸收。这些频带归因于配体内IT-> n〜*跃迁和n-> TT〜*电荷转移跃迁。 Eu（III）离子光谱的一般特征是复合物形成时吸收带向较低能量的转移。 “肾小球效应;β”。我们计算了Eu（III）-聚吡啶配合物的β，b〜（1/2）（共价度量）和8％（Sinha参数）的值。 b〜（l / 2）的值按配体顺序排列：（pyre）>（tpy）>（bpyca）>（biq），（dmbpy）>（bpy）。与Eu（III）离子相比，具有bpyca配体的Eu（III）配合物的荧光强度增强了约7.56倍，对于具有tpy配体的强Eu（ffl）配合物，其荧光强度增强了约30倍。分子内能量转移（IMET）过程的主要荧光跃迁发生于从Eu（III）-聚吡啶的螯合物吸收带状态到〜7F的J歧管，这是自旋禁止型，三重态的作用极为重要Nicolson-Shain的公式用于分析电极反应参数。从CV的分析结果来看，Eu（III）的电极反应的传递系数（a），扩散系数（D，cm〜2 / s），标准速率常数k〜°f（cm / s）获得了与聚吡啶的配合物。并讨论了形成常数（Kf）。

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