Aggregation-induced emission enhancement (AIEE) of tetrarhenium(<scp>i</scp>) metallacycles and their application as luminescent sensors for nitroaromatics and antibiotics
Mohammad Nurnabi, Shunmugasundaram Gurusamy, Jing‐Yun Wu, Chung‐Chou Lee, Malaichamy Sathiyendiran, Shengming Huang, Che‐Hao Chang, Ito Chao, Gene‐Hsiang Lee, Shie‐Ming Peng, Veerasamy Sathish, Pounraj Thanasekaran, Kuang‐Lieh Lu
Abstract
-thaq = 1,2,4-trihydroxy-9,10-anthraquinone) under solvothermal conditions is described. The metallacycles 3a,b and 4 underwent aggregation-induced emission enhancement (AIEE) in THF upon the incremental addition of water. TEM images revealed that metallacycle 3a in a 60% aqueous THF solution formed rectangular aggregates with a wide size distribution, while a 90% aqueous THF solution resulted in the formation of a mixture of nanorods and amorphous aggregates due to rapid and abrupt aggregation. UV-vis and emission spectral profiles supported the formation of nanoaggregates of metallacycles 3a,b and 4 upon the gradual addition of water to a THF solution containing metallacycles. Further studies indicated that these nanoaggregates were excellent probes for the sensitive and selective detection of nitro group containing picric acid (PA) derivatives as well as antibiotics.