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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >High-performance fluorescence sensing of lanthanum ions (La3+) by a polydentate pyridyl-based quinoxaline derivative
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High-performance fluorescence sensing of lanthanum ions (La3+) by a polydentate pyridyl-based quinoxaline derivative

机译：多齿吡啶基喹喔啉衍生物对镧离子（La3 +）的高性能荧光传感

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摘要

A polydentate pyridyl derivative, 2,3,6,7,10,11-hexa(2-pyridy0-dipyrazino (2,3-f:2',3'-h]quinoxaline (HPDQ), exhibits a high-performance fluorescence response to La3+ with an similar to 65 nm redshifted emission wavelength and 38 fold enhanced intensity, in contrast to its weakened emission for other lanthanide ions. The final La3+ coordination complex in solution has a stoichiometric ratio of 1: 3 of ligand-to-metal, as testified by the Job's plot and single crystal structure analyses. The red shift of the luminescence emission as well as UV-vis absorption was rationalized in terms of the change of the electron structure as indicated by nuclear magnetic titration, electrochemical experiment and density functional theoretical calculation, while the significant enhancement of emission was attributed to the enhanced pi conjugated extent of HPDQ caused by La3+ coordination.
机译：多齿吡啶基衍生物2,3,6,7,10,11-六（2-吡啶基0-二吡嗪并（2,3-f：2'，3'-h]喹喔啉（HPDQ））表现出高性能的荧光与其他镧系离子的发射减弱相比，对La3 +的响应具有类似65nm的红移发射波长和38倍的增强强度，溶液中最终的La3 +配位络合物的化学计量比为配体与金属的1：3 ，通过Job's图和单晶结构分析证明，通过核磁滴定，电化学实验和密度泛函表明的电子结构变化，可以合理化发光发射的红移以及UV-vis吸收理论计算，而发射的显着增强归因于La3 +配位引起的HPDQ的π共轭增强。

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