Extra-long C C single bonds via negative hyperconjugation in perfluoropinacolate complexes
Extra-long C C single bonds via negative hyperconjugation in perfluoropinacolate complexes
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全氟频那醇复合物中通过负超共轭形成超长 C C 单键
DOI:
10.1016/j.poly.2022.116040
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发表时间:
2022
期刊:
影响因子:
2.6
通讯作者:
Doerrer, Linda H.
中科院分区:
文献类型:
--
作者:
Homuth, Paul A.;McNeely, James;Doerrer, Linda H.
A computational study on a series of pinacolate ligands with varying degrees of fluorination (from four to zero CF3groups) has been carried out to understand the exceptionally long central Csingle bondC bonds in crystal structures with the perfluoropinacolate ligand, (pinF). The systems were studied with both DFT (PBE0) andab-initio(MP2 NEVPT2) models to elucidate the features of the electronic structure responsible for the elongated central bond routinely observed in {A(pinF)} species. Two main influences are responsible: (i) negative hyperconjugation exists between the alkoxide O atom lone pairs and the central Csingle bondC σ* bond which also have resonance forms that formally break the central Csingle bondC bond and (ii) the lack of hydrogen bonding between any Csingle bondH bonds and the ligand O atoms. Steric influences do not play a significant role, but a central atom A with a point charge of at least plus two bound to pinFis required to reproduce the crystallographically determined Csingle bondC distances.
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DOI:
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发表时间:
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期刊:
影响因子:
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作者:
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通讯作者:
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DOI:
--
发表时间:
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期刊:
影响因子:
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