首页> 外文期刊>Chemistry: A European journal >Heterodinuclear Cryptates [EuML(dmf)](ClO_4)_2 (M = Ca, Cd, Ni, Zn): Tuning the Luminescence of Europium(III) through the Selection of the Second Metal Ion
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Heterodinuclear Cryptates [EuML(dmf)](ClO_4)_2 (M = Ca, Cd, Ni, Zn): Tuning the Luminescence of Europium(III) through the Selection of the Second Metal Ion

机译:异核隐窝[EuML(dmf)](ClO_4)_2(M = Ca,Cd,Ni,Zn):通过选择第二种金属离子来调节((III)的发光

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摘要

Four heterodinuclear cryptates [EuML(dmf)](ClO_4)_2 (M = Ca, Cd, Ni, Zn) were synthesized by a two-step method (L denotes deprotonated anionic cryptand synthesized by condensation of tris(2-aminoethyl)amine with 2,6-diformyl-4-chlorophenol). The ES-MS spectra of the four cryptates and the crystal structure of [EuNiL(dmf)](ClO_4)_2(centro dot)MeCN confirm that a strict dinuclear Eu~(III)-M~(III) entity exits in the cryptates. The cyclic voltammeter and luminescence spectral investigations indicate that the introduction of second metal ions into the mononuclear Eu~(III)cryptate result in a negative shift of the redox potential of Eu~(III) and a change in luminescence intensity of Eu~(III). The cryptate [EuML(dmf)](ClO_4)_2 was shown to quench the emission of Eu~(III) when M = Ni and to enhance the emission of Eu~(III) when M = Ca, Cd, and Zn in the sequence: mononuclear < Eu-Ca < Eu-Cd < En-Zn.
机译:通过两步法合成了四个异双核密码子[EuML(dmf)](ClO_4)_2(M = Ca,Cd,Ni,Zn)(L表示去质子化的阴离子密码子,并通过三(2-氨基乙基)胺与2,6-二甲酰基-4-氯苯酚)。四个隐窝的ES-MS光谱和[EuNiL(dmf)](ClO_4)_2(中心点)MeCN的晶体结构证实了严格的双核Eu〜(III)-M〜(III)实体存在于隐窝中。循环伏安法和发光光谱研究表明,将第二种金属离子引入单核Eu〜(III)加密物中会导致Eu〜(III)的氧化还原电势发生负移并导致Eu〜(III)的发光强度发生变化。 )。研究表明,当M = Ni时,加密的[EuML(dmf)](ClO_4)_2可以猝灭Eu〜(III)的发射,而当M = Ca,Cd和Zn时,可以增强Eu〜(III)的发射。顺序:单核

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