IIT-M, IISc team makes carbon-free version of ferrocene sandwich, Pg13

Key Highlights:

• Researchers from IIT-Madras and IISc Bengaluru created a stable, carbon-free analogue of ferrocene.
• The new compound uses boron rings and osmium instead of carbon rings and iron.
• The team used computer modelling to predict which metal would best stabilize a boron sandwich, identifying osmium.
• The discovery demonstrates that the sandwich architecture is not exclusive to carbon-based organic chemistry.

Detailed Insights:

• Ferrocene, discovered over seven decades ago, is an iron atom sandwiched between two flat carbon rings and is significant in organometallic chemistry.
• The team reacted a polymeric osmium-bromine precursor with a borane-dimethyl sulphide reagent, heating the mixture to 100°C for eight hours to create the complex.
• X-ray analysis revealed a sandwich structure with an osmium atom between two parallel, five-membered boron rings, which used bridging hydrogen atoms between the boron atoms.
• The boron rings' bridging hydrogen atoms redirect electron orbitals towards the metal, creating a stronger bond than in ferrocene, potentially leading to new catalysts stable at higher temperatures.
• This breakthrough could pave the way for metal sandwiched/intercalated bilayers and multilayers, expanding the possibilities in 2D chemistry of boron.

Scientific/Technical Concepts Involved:

• Ferrocene: A compound with an iron atom sandwiched between two flat carbon rings.
• Organometallic Chemistry: The study of compounds containing bonds between carbon and a metal.
• X-ray Diffraction: A technique used to determine the arrangement of atoms within a crystal.