Researchers have developed a groundbreaking organic ink known as R-(BN)₂, which demonstrates substantial promise for security writing and imaging applications. R-(BN)₂ is assembled from only 1 wt% of a chiral scaffold. This small quantity imparts such distinct properties that it’s unlike traditional building materials. A group from the Indian Institute of Chemical Technology (IPC) led the path on this breakthrough. Professor P Thilagar was the corresponding author for this project.
The preparation of R-(BN)₂ followed an elaborate synthetic route that results in two naphthalene-type chromophores being interlocked around a central helix. This design greatly suppresses non-radiative decay, enabling R-(BN)₂ to show long-lived phosphorescence. Initially, the research team performed the reaction using n-butyllithium. They controlled the atmosphere to be inert and cooled the reaction down to -78°C, creating a perfect environment for the formation of the B–N bond.
Enhanced Fluorescence and Phosphorescence
R-(BN)₂ glows spectacularly bright under ultraviolet (UV) light, revealing its almost superlative fluorescence. This distinctive feature unlocks thrilling opportunities for duties such as security writing. The phosphorescent chiral ink exhibits a substantially brighter phosphorescence compared to its achiral counterpart, (BN)₁. This ensures that it is a very attractive option for industries where safety and long lasting visibility is critical.
The long afterglow of R-(BN)₂ at 298 K in N2 atmosphere increases the applicability and utility. This quality is particularly useful in areas where persistent exposure is key. This property would be highly advantageous in security applications, for example anti-counterfeiting applications on sensitive documents or currency.
The sensitivity of the B–N bond formation in R-(BN)₂ to moisture and oxygen poses difficulties. It creates amazing new opportunities for real world applications. The study’s researchers indicate that proper treatment and storage environments will be crucial for preserving the quality of the ink.
Collaboration and Research Findings
To do this, Professor Thilagar’s team at IPC collaborated with Neal Hickey from the University of Trieste, Italy. El-Bayoumi’s lab, and together they laid the groundwork for R-(BN)₂. Hickey’s expertise and credibility helped them confirm the crystal structure of R-(BN)₂, further lending credence to the ground-breaking approach taken by the researchers.
These results were recently released from our study which is available online at DOI 10.1038/s42004-025-01529-8. This study demonstrates the potential use of R-(BN)₂ for imaging and security applications. It’s a great affirmation of how new organic materials can push the technology forward.
R-(BN)₂ also has other unique properties that distinguish it as a major innovation in organic chemistry. This breakthrough is sure to fuel future development opportunities in security technologies. This research is more than just academic interest. If so, it would have far-reaching effects on sectors that depend on tamperproof documentation and advanced imaging methods.