Tertiary Phosphine and Arsine Complexes of Phosphorus Pentafluoride: Synthesis, Properties, and Electronic Structures.

Tertiary Phosphine and Arsine Complexes of Phosphorus Pentafluoride: Synthesis, Properties, and Electronic Structures.
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五氟化磷的叔膦和胂络合物:合成、性质和电子结构。

DOI:
10.1021/acs.inorgchem.9b03630
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发表时间:
2020
影响因子:
4.6
通讯作者:
Dyke JM
Dyke JM
中科院分区:
化学2区
文献类型:
--
作者:
Dyke JM

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在无水二氯甲烷或正己烷中,PMe 3或PPh 3与PF 5反应生成白色湿敏配合物[PF 5(PR 3)](R = Me,Ph)。类似的反应涉及二膦o-C6 H4(PR 2)2,得到配合物[PF 4 {o-C6 H4(PR 2)2}][PF 6]。[PF_5(PR_3)]和[PF_4 {o-C_6 H_4(PMe_2)_2}][PF_6]的X射线结构显示为假八面体氟磷中心。多核核磁共振谱(1H,19 F {1H},31 P {1H})表明,在CH 2Cl 2/CD 2Cl 2溶液中,晶体学确定的结构是[PF 5(PMe 3)]和[PF 4 {o-C6 H4(PMe 2)2}][PF 6]存在的唯一物质,但[PF 5(PPh 3)]和[PF 4 {o-C6 H4(PPh 2)2}][PF 6]在环境温度下表现出膦的可逆解离,尽管在低温下交换减慢。分析了配合物的~(19)F ~(1H)和~(31)P ~(1H)NMR谱,其中包括阳离子[PF_4 {o-C_6 H_4(PMe_2)_2}]~+的~(19)F ~(1H)和~(31)P ~(1H)NMR谱。不稳定的[PF 5(AsMe 3)],在环境温度下几个小时内分解,也已被分离和光谱表征; AsPh 3和SbEt 3都没有形成类似的复合物。用密度泛函理论计算了PF 5配合物的电子结构。[PF 5(PMe 3)]、[PF 5(PPh 3)]和[PF 4 {o-C6 H4(PMe 2)2}]+的DFT优化几何构型与它们各自的晶体结构几何构型很好地一致。对PF 5-L复合物的密度泛函理论计算表明,P-L键强度随L的福尔斯顺序为PMe 3> PPh 3> AsMe 3,与实验观察到的稳定性一致;在PF 5-L复合物中,形成这些复合物时,从L到PF 5的电子转移也遵循PMe 3> PPh 3> AsMe 3的顺序。
The reaction of PMe3or PPh3with PF5in anhydrous CH2Cl2or hexane forms the white, moisture-sensitive complexes [PF5(PR3)] (R = Me, Ph). Similar reactions involving the diphosphineso-C6H4(PR2)2afford the complexes [PF4{o-C6H4(PR2)2}][PF6]. The X-ray structures of [PF5(PR3)] and [PF4{o-C6H4(PMe2)2}][PF6] show pseudo-octahedral fluorophosphorus centers. Multinuclear NMR spectra (1H,19F{1H},31P{1H}) show that in solution in CH2Cl2/CD2Cl2the structures determined crystallographically are the only species present for [PF5(PMe3)] and [PF4{o-C6H4(PMe2)2}][PF6] but that [PF5(PPh3)] and [PF4{o-C6H4(PPh2)2}][PF6] exhibit reversible dissociation of the phosphine at ambient temperatures, although exchange slows at low temperatures. The complex19F{1H} and31P{1H} NMR spectra have been analyzed, including those of the cation [PF4{o-C6H4(PMe2)2}]+, which is a second-order AA′XX′B2M spin system. The unstable [PF5(AsMe3)], which decomposes in a few hours at ambient temperatures, has also been isolated and spectroscopically characterized; neither AsPh3nor SbEt3forms similar complexes. The electronic structures of the PF5complexes have been explored by DFT calculations. The DFT optimized geometries for [PF5(PMe3)], [PF5(PPh3)], and [PF4{o-C6H4(PMe2)2}]+are in good agreement with their respective crystal structure geometries. DFT calculations on the PF5-L complexes reveal the P–L bond strength falls with L in the order PMe3> PPh3> AsMe3, consistent with the experimentally observed stabilities, and in the PF5-L complexes, electron transfer from L to PF5on forming these complexes also follows the order PMe3> PPh3≈ AsMe3.
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