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The development of aggregation induced emission luminogens (AIEgens) has attracted increasing attention in recent years as the potential of their application in various areas, including data storage and bioimaging has been realised. However, most of the AIEgens have large conjugation systems which were obtained via lengthy synthetic processes. Herein, we have successfully developed a new pair of far-red fluorescent molecules (λ_max = 652 nm, 688 nm), ROF1 and ROF2, which were designed and derivatized from rofecoxib by one-step reaction. Specifically, ROF1 with a para-piperidine shows a classical aggregation caused quenching (ACQ) effect. In contrast, by shifting the piperidine group from para-to ortho-position, the ROF2 exhibits typical AIE behavior. Based on the analyses of single-crystal X-ray data, the AIE property of ROF2 could be ascribed to the highly twisted molecular conformation and loose …