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Isolation of Homoleptic Dicationic Tellurium and Monocationic Bismuth Analogues of Non-N-Heterocyclic Carbene Derivatives
Organometallics ( IF 2.5 ) Pub Date : 2020-01-07 , DOI: 10.1021/acs.organomet.9b00698
Rajesh Deka 1, 2, 3 , Arup Sarkar 1 , Ray J. Butcher 4 , Peter C. Junk 2, 5 , David R. Turner 2, 3 , Glen B. Deacon 2, 3 , Harkesh B. Singh 1, 2
Affiliation  

The first examples of Te analogues of non-N-heterocyclic carbene (non-NHC) derivatives, [(ppy)2Te]·2ClO4, [4]·2ClO4, and[(ppy)2Te]·2OTf, [5]·2OTf [where ppy = 2-(2′-pyridyl)phenyl and Tf = O2SCF3] are reported by the metathesis reaction of diorganoiodotelluronium(IV) cation, [(ppy)2TeI]·I3, [3]·I3, with AgClO4 and AgOTf, respectively. The metathesis reaction of ppyTeCl3, 6, with an excess of AgClO4 resulted in the isolation of [ppyTe(μ-O)]2·2ClO4, [8]·2ClO4. The reaction of triorganotelluronium(IV) cation [(ppy)3Te]·Br, [10]Br, with K2PdCl4 afforded [(ppy)2TeCl]·[(ppy)PdCl2], 11. The generality of the “ppy” group on stabilizing other main-group non-NHC analogues has been further established by synthesizing the second example of a Bi analogue of a non-NHC derivative, namely, bismuthenium ion, [(ppy)2Bi]·Cl, [12]·Cl, using the same aryl group. All of the synthesized compounds are unambiguously authenticated by single-crystal X-ray diffraction studies. DFT calculations [natural bond orbital (NBO), atoms in molecules (AIM), and electron localization function (ELF)] indicate that the stability of the non-NHC carbenoids relies on the σ-hole participation of the Te/Bi atom with the strong intramolecular coordination ability of the pyridyl N atom of the aryl substituent.

中文翻译:

非N-杂环碳衍生物的同阳离子二碲和单阳离子铋类似物的分离

非N杂环卡宾(non-NHC)衍生物的Te类似物的第一个例子是[(ppy)2 Te]·2ClO 4,[ 4 ]·2ClO 4和[(ppy)2 Te]·2OTf,[ 5 ]·2OTf [其中ppy = 2-(2'-吡啶基)苯基,Tf = O 2 SCF 3 ]由二有机碘代碲酸铵(IV)阳离子[[ppy)2 TeI]·I 3,[ 3 ]·I 3,分别为AgClO 4和AgOTf。ppyTeCl的复分解反应36,与过量的AgClO 4导致分离出[ppyTe(μ-O)] 2 ·2ClO 4,[ 8 ]·2ClO 4。三有机碲化铵(IV)阳离子[(ppy)3 Te]·Br,[ 10 ] Br与K 2 PdCl 4的反应得到[(ppy)2 TeCl]·[(ppy)PdCl 2 ],11。通过合成非NHC衍生物的Bi类似物的第二个例子,即双muthiumium离子,[(ppy)2 Bi] ,进一步稳定了“ ppy”基团在稳定其他主族非NHC类似物方面的普遍性。·Cl,[ 12]·Cl,使用相同的芳基。所有合成的化合物均通过单晶X射线衍射研究明确鉴定。DFT计算[天然键轨道(NBO),分子中的原子(AIM)和电子定位功能(ELF)]表明,非NHC类胡萝卜素的稳定性取决于Te / Bi原子与σ空穴的参与。芳基取代基的吡啶基N原子具有很强的分子内配位能力。
更新日期:2020-01-07
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