Pyridine-ring containing twisttetraazaacene: Synthesis, physical properties, crystal structure and picric acid sensing.

Novel pyridine-ring containing twisttetraazaacene 9,14-diphenylpyreno[4,5- g ]isoquinoline ( 1 ) and its full-carbon derivative 9,14-diphenyldibenzo[ de , qr ]tetracene ( 2 ) have been synthesized and fully characterized. Studies showed that compound 1 could identify picric acid (PA) over other common nitro compounds with high selectivity and sensitivity. Upon the addition of PA, the emission peak of compound 1 in CH 3 CN was red shifted from 447 to 555 nm with a fluorescence quenching efficiency as high as 95%, the detection limit was calculated to be 2.42 μM, while its full-carbon derivative ( 2 ) could not exhibit this kind of performance. The possible mechanism with the enhanced PA detection efficiency in pyridine-ring containing twisttetraazaacene ( 1 ) than its full-carbon derivative ( 2 ) was also investigated. [ABSTRACT FROM AUTHOR]