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- Title
Hexagonal Planar [B<sub>6</sub>H<sub>6</sub>] within a [B<sub>6</sub>H<sub>12</sub>] Borate Complex: Structure and Bonding of [(Cp*Ti)<sub>2</sub>(μ‐ɳ<sup>6</sup> : ɳ<sup>6</sup>‐B<sub>6</sub>H<sub>6</sub>)(μ‐H)<sub>6</sub>]
- Authors
Kar, Sourav; Bairagi, Subhash; Haridas, Anagha; Joshi, Gaurav; Jemmis, Eluvathingal D.; Ghosh, Sundargopal
- Abstract
Isolation of planar [B6H6] is a long‐awaited goal in boron chemistry. Several attempts in the past to stabilize [B6H6] were unsuccessful due to the domination of polyhedral geometries. Herein, we report the synthesis of a triple‐decker sandwich complex of titanium [(Cp*Ti)2(μ‐η6 : η6‐B6H6)(μ‐H)6] (1), which features the first‐ever experimentally achieved nearly planar six‐membered [B6H6] ring, albeit within a [B6H12] borate. The small deviation from planarity is a direct consequence of the predicted structural pattern of the middle ring in 24 Valence Electron Count (VEC) triple‐decker complexes. The large ring size of [B6H6] in 1 brings the metal–metal distance into the bonding range. However, significant electron delocalization from the M−M bonding orbital to the bridging hydrogen and B−B skeleton in the middle decreases its bond strength.
- Subjects
CONDUCTION electrons; BORATES; ELECTRON delocalization; BOND strengths; METAL-metal bonds
- Publication
Angewandte Chemie, 2022, Vol 134, Issue 35, p1
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.202208293