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

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Title: [Os(η5-B5H10)2]: A carbon-free analog of ferrocene.
Authors: Mohapatra, Stutee (AUTHOR), Saha, Suvam (AUTHOR), Joshi, Gaurav (AUTHOR), Gupta, Urvashi (AUTHOR), Patel, Deepak Kumar (AUTHOR), Jemmis, Eluvathingal D. (AUTHOR), Ghosh, Sundargopal (AUTHOR)
Source: Science. 4/23/2026, Vol. 392 Issue 6796, p411-414. 4p.
Subjects: Organometallic chemistry, Osmium compounds, Boranes, Crystallography, Molecular conformation, Orbital hybridization, Metallic bonds
Abstract: 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(η5-B5H10)2], which is qualitatively similar to ferrocene in structure and bonding. The metal-ring bonding is much stronger in [Os(η5-B5H10)2], owing to rehybridization of the π 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(η5-B5H10)(η3-B5H10)], which features a coordination mode unknown for ferrocene, has also been isolated. A similar attempt for [Ru(η5-B5H10)2] resulted only in [Ru(η5-B5H10)(η3-B5H10)]. Editor's summary: Elucidation of the structure of ferrocene was a foundational event in the development of organometallic chemistry. Once it was clear that iron could be sandwiched between two flat rings of carbon, all manner of other sandwich compounds with numerous catalytic and electrochemical applications were produced. Inorganic chemists have long sought to replicate the bonding motif using elements other than carbon. Mohapatra et al. now report a ferrocene analog in which two boron rings sandwich an osmium ion. Each boron center in the pentagonal rings is bonded to its neighboring borons, as well as to one terminal and two bridging hydrides. —Jake S. Yeston [ABSTRACT FROM AUTHOR]
Copyright of Science is the property of American Association for the Advancement of Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Psychology and Behavioral Sciences Collection
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  Data: [Os(η<superscript>5</superscript>-B<subscript>5</subscript>H<subscript>10</subscript>)<subscript>2</subscript>]: A carbon-free analog of ferrocene.
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  Data: <searchLink fieldCode="AR" term="%22Mohapatra%2C+Stutee%22">Mohapatra, Stutee</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Saha%2C+Suvam%22">Saha, Suvam</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Joshi%2C+Gaurav%22">Joshi, Gaurav</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Gupta%2C+Urvashi%22">Gupta, Urvashi</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Patel%2C+Deepak+Kumar%22">Patel, Deepak Kumar</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Jemmis%2C+Eluvathingal+D%2E%22">Jemmis, Eluvathingal D.</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ghosh%2C+Sundargopal%22">Ghosh, Sundargopal</searchLink> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Science%22">Science</searchLink>. 4/23/2026, Vol. 392 Issue 6796, p411-414. 4p.
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  Data: <searchLink fieldCode="DE" term="%22Organometallic+chemistry%22">Organometallic chemistry</searchLink><br /><searchLink fieldCode="DE" term="%22Osmium+compounds%22">Osmium compounds</searchLink><br /><searchLink fieldCode="DE" term="%22Boranes%22">Boranes</searchLink><br /><searchLink fieldCode="DE" term="%22Crystallography%22">Crystallography</searchLink><br /><searchLink fieldCode="DE" term="%22Molecular+conformation%22">Molecular conformation</searchLink><br /><searchLink fieldCode="DE" term="%22Orbital+hybridization%22">Orbital hybridization</searchLink><br /><searchLink fieldCode="DE" term="%22Metallic+bonds%22">Metallic bonds</searchLink>
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  Data: 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(η5-B5H10)2], which is qualitatively similar to ferrocene in structure and bonding. The metal-ring bonding is much stronger in [Os(η5-B5H10)2], owing to rehybridization of the π 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(η5-B5H10)(η3-B5H10)], which features a coordination mode unknown for ferrocene, has also been isolated. A similar attempt for [Ru(η5-B5H10)2] resulted only in [Ru(η5-B5H10)(η3-B5H10)]. Editor's summary: Elucidation of the structure of ferrocene was a foundational event in the development of organometallic chemistry. Once it was clear that iron could be sandwiched between two flat rings of carbon, all manner of other sandwich compounds with numerous catalytic and electrochemical applications were produced. Inorganic chemists have long sought to replicate the bonding motif using elements other than carbon. Mohapatra et al. now report a ferrocene analog in which two boron rings sandwich an osmium ion. Each boron center in the pentagonal rings is bonded to its neighboring borons, as well as to one terminal and two bridging hydrides. —Jake S. Yeston [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Science is the property of American Association for the Advancement of Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1126/science.aed9192
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        Text: English
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      – SubjectFull: Organometallic chemistry
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      – SubjectFull: Osmium compounds
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      – SubjectFull: Boranes
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      – SubjectFull: Crystallography
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      – SubjectFull: Molecular conformation
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      – SubjectFull: Orbital hybridization
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      – SubjectFull: Metallic bonds
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      – TitleFull: [Os(η5-B5H10)2]: A carbon-free analog of ferrocene.
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              Text: 4/23/2026
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              Y: 2026
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