[Os(η5-B5H10)2]: A carbon-free analog of ferrocene

• 成果类型: Article
• 署名作者: Mohapatra, Stutee; Saha, Suvam; Joshi, Gaurav; Gupta, Urvashi; Patel, Deepak Kumar; Jemmis, Eluvathingal D.; Ghosh, Sundargopal
• 署名单位: Indian Institute of Technology System (IIT System); Indian Institute of Technology (IIT) - Madras; Indian Institute of Science (IISC) - Bangalore
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-8075; 1095-9203
• DOI: 10.1126/science.aed9192
• 发表日期: 2026-04-23
• 页码: 411-414
• 关键词: compound; complex

摘要

The synthesis of a carbon-free analog of ferrocene has been a long-standing goal in inorganic chemistry. We report here the preparation and crystallographic characterization of the carbon-free sandwich complex [Os(eta 5-B5H10)2], which is qualitatively similar to ferrocene in structure and bonding. The metal-ring bonding is much stronger in [Os(eta 5-B5H10)2], owing to rehybridization of the pi molecular orbitals brought in by the bridging B-H-B hydrogens and the bent B-Ht bonds of the larger B5H10 ring (where B-Ht is the terminal B-H bond). This also leads to an unusually short ring-ring separation of 3.071 angstroms and a staggered conformation. The isomeric [Os(eta 5-B5H10)(eta 3-B5H10)], which features a coordination mode unknown for ferrocene, has also been isolated. A similar attempt for [Ru(eta 5-B5H10)2] resulted only in [Ru(eta 5-B5H10)(eta 3-B5H10)].