Indian researchers solve a long-standing puzzle – in chemistry

Indian researchers have solved a decades-old chemistry puzzle by creating a carbon-free molecule that replicates the ‘sandwich’ structure of ferrocene, a compound central to modern technologies like medicines and electronics. Ferrocene, discovered in the 1950s, features an iron atom trapped between two carbon rings, but scientists had long struggled to replicate this structure without carbon. A team from IIT Madras, led by Sundargopal Ghosh and Stutee Mohapatra, and Eluvathingal Jemmis from the Indian Institute of Science, Bengaluru, succeeded by designing a molecule with osmium at its core and boron-based rings instead of carbon. The discovery, published in *Science*, confirms that non-carbon elements can form similarly stable ‘sandwiched’ structures, addressing a fundamental question in chemistry. Ferrocene’s unique stability and versatility have made it essential in fields like batteries and advanced materials, but its reliance on carbon limited alternatives. The new molecule, though still under investigation for practical applications, shows strong bonding between osmium and boron rings, suggesting potential robustness over ferrocene. Researchers emphasize its academic significance while exploring future material innovations. The breakthrough follows global efforts to replicate ferrocene’s structure without carbon, which had repeatedly failed until this achievement. Ghosh noted the discovery opens new avenues for designing materials with specialized properties, though its full implications remain under study. The molecule’s stability and novel composition mark a milestone in inorganic chemistry, challenging long-held assumptions about structural constraints in molecular design.