A Radical Tricationic Rhomboid Tetraborane(4) with Four‐Center,Five‐Electron Bonding |
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| Authors: | Sebastian Litters Dr. Elisabeth Kaifer Prof. Hans‐Jörg Himmel |
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| Affiliation: | Anorganisch-Chemisches Institut, Ruprecht-Karls-Universit?t Heidelberg, Heidelberg, Germany |
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| Abstract: | The red‐colored tetraborane(4) [B4(hpp)4]3+. ( 3 ; hpp=1,3,4,6,7,8‐hexahydro‐2H‐pyrimido[1,2‐a]pyrimidinate) with a rhomboid B4 skeleton stabilized by four N donors, was synthesized by the reaction of the strong hydride abstraction reagent [(acridine)BCl2][AlCl4] with the electron‐rich diborane(4) [HB(hpp)]2 ( 1 ). The salt 3 [AlCl4]3 was structurally characterized and the presence of unpaired electrons proven by EPR measurements. The unprecedented radical tricationic 3 is distinguished by a high positive charge and boron atoms in a low oxidation state (less than two). |
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| Keywords: | boron hydride abstraction multiple-center bonding radicals |
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