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In this study, the use of the novel 1,6,7,10-tetramethylfluoranthene as an acceptor in the organic solar cell has been demonstrated.

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<p>Herein, we report<b> </b>a novel fluorescent probe for the sequential detection of Copper II (Cu²⁺) and lactic acid. The probe based on acyl-thiourea derivative, N-((6-methoxypyridin-2-yl)carbamothioyl)benzamide (<b>1</b>) was synthesized, and its application as dual sensor for Cu²⁺ and lactic acid is reported. The dual detection by the probe is possible since <b>1 </b>formed complex with Cu²⁺and yielded yellow solution which disappeared after the addition of lactic acid. The probe exhibits yellow fluorescence with Cu²⁺and LOD of Cu²⁺ with fluorescence is as low as 0.1ppm. The fluorescence is quenched after the addition of lactic acid and LOD of fluorescence quenching by lactate is as low as 1 ppm. Further, structural modification in the probe <b>1</b> suggest crucial role of both pyridine and acyl-thiourea moiety in the binding of Cu²⁺. Interestingly, <b>1</b> also assembles to fluorescent fibers which show tunable emission properties. These fibers are broken in the presence of Cu²⁺ and regenerated in the presence of lactic acid. Hence, disaggregation at molecular level might play a crucial role in causing yellow fluorescence in the presence of Cu²⁺. To, the best of our knowledge, this is the first report wherein a dual sensor for Cu²⁺ and lactate ion is synthesized and it may in all possibilities pave the way for diagnosis of Cu²⁺ associated disorders like Wilson’s disease and in the detection of elevated lactate levels which are associated with wide range of pathologies like mitochondrial diseases, cerebral ischemia and cancer.<b></b></p>

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