Synthesis of 2,2′-biimidazole-based platinum( ii ) polymetallaynes and tuning their fluorescent response behaviors to Cu 2+ ions through optimizing the configuration of the organic spacers and steric effect

• Published in: RSC advances 2015, Vol.5 (108), p.88758-88766
• Main Authors: Zhang, Huiming, Yan, Xiaogang, Zhao, Jiang, Yang, Xiaolong, Huang, Zuan, Zhou, Guijiang, Wu, Yong
• Format: Article
• Language: English
• ISSN: 2046-2069; 2046-2069
• DOI: 10.1039/C5RA17853C

Under controlled conditions, platinum( ii ) polymetallaynes with different 2,2′-biimidazole-based organic spacers have been synthesized readily. Their photophysical properties and fluorescent response behaviors to Cu 2+ ions have been investigated in detail. By adjusting both the configuration of the 2,2′-biimidazole-based spacers and the steric effect, the fluorescent response behaviors of the polymetallaynes to Cu 2+ ions can be tuned dramatically. The fluorescent signal from the polymetallayne with an optimized structure can be quenched rapidly by Cu 2+ ions with a high Stern–Volmer constant K SV of ca. 6.8 × 10 4 M −1 and a low detecting limit (DL) of ca. 0.99 ppm. These results not only highlight the great potential of these polymetallaynes as novel Cu 2+ sensors, but also provide new strategies for optimizing the sensing abilities of the 2,2′-biimidazole-based ion sensors.