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The nitrogen-boron-nitrogen (NBN) unit modified polycyclic aromatic hydrocarbons (PAHs) have garnered significant attention due to their captivating electronic and optoelectronic properties. Herein, we present a succinct palladium-catalyzed cyclization strategy methodology, yielding a diverse array of NBN-phenalenes. The inherent structural diversity of these compounds renders an auspicious avenue the to probe into their intricate structure-property correlations. Notably, thorough scrutiny involving ultraviolet-visible, fluorescence spectra, and density functional theory (DFT) calculations reveals the tunable nature of their geometric, and electronic structures, as well as their photophysical characteristics. Remarkably, the NBN-fused ring system has been effectively harnessed for the detection of nitro explosives, proving its high sensitivity and ability to detect trinitrotoluene (TNT) at the ppm level. Test strips were used to identify TNT visually. The potential applications of this expeditious and precise TNT detection technique encompass a fortified public safety apparatus. This research offers a strategic approachy to constructing nitrogen-boron-nitrogen fused ring structures, exploring their luminescent properties, and forging innovative capabilities.
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