Unexpected Enhanced acidity of Diborane-Nitrogen Base complexes

IF 2.9 3区 化学 Q3 CHEMISTRY, PHYSICAL Chemical Physics Letters Pub Date : 2025-02-01 Epub Date: 2024-11-29 DOI:10.1016/j.cplett.2024.141782
Manuel Yáñez , Otilia Mó , M.Merced Montero-Campillo , Ibon Alkorta , José Elguero
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Abstract

The effect that borane and diborane have on the structure and acidity of various N-bases was analyzed using G4 ab-initio calculations. Although diborane is expected to be a stronger Lewis acid than borane, its interaction with N-bases is weaker due to the loss of one of its (3c,2e) bonds. Surprisingly, however, diborane has a significantly greater effect on the intrinsic acidity of these bases than borane. Upon deprotonation of the base, the interaction strength increases by a factor of 10 with diborane and only 3 with borane, as both the B–N and BH3···BH3 interactions are reinforced in diborane.

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二硼烷-氮碱配合物的意外酸性增强
采用G4从头算分析了硼烷和二硼烷对各种n碱的结构和酸度的影响。虽然二硼烷被认为是比硼烷更强的路易斯酸,但由于失去了一个(3c,2e)键,二硼烷与n碱的相互作用较弱。然而,令人惊讶的是,二硼烷对这些碱的固有酸度的影响比硼烷大得多。碱去质子化后,由于B-N和BH3···BH3相互作用在二硼烷中得到加强,与二硼烷的相互作用强度增加了10倍,而与硼烷的相互作用强度仅增加了3倍。
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来源期刊
Chemical Physics Letters
Chemical Physics Letters 化学-物理:原子、分子和化学物理
CiteScore
5.70
自引率
3.60%
发文量
798
审稿时长
33 days
期刊介绍: Chemical Physics Letters has an open access mirror journal, Chemical Physics Letters: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. Chemical Physics Letters publishes brief reports on molecules, interfaces, condensed phases, nanomaterials and nanostructures, polymers, biomolecular systems, and energy conversion and storage. Criteria for publication are quality, urgency and impact. Further, experimental results reported in the journal have direct relevance for theory, and theoretical developments or non-routine computations relate directly to experiment. Manuscripts must satisfy these criteria and should not be minor extensions of previous work.
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