The Nature of P(σ<sup>2</sup>λ<sup>3</sup>↔σ<sup>2</sup>λ<sup>1</sup>) Dualism: 3a,6a-Diaza-1,4-diphosphapentalene as a Form of Stabilized Singlet Phosphinidene
作者:Alexander N. Kornev、Yulia S. Panova、Vyacheslav V. Sushev、Diego F. Dorado Daza、Alexander S. Novikov、Anton V. Cherkasov、Georgy K. Fukin、Gleb A. Abakumov
DOI:10.1021/acs.inorgchem.9b02690
日期:2019.12.2
s (DDPs), which are best viewed as stabilized singlet phosphinidenes. It was found that DDPs undergo reversible oligomerization in solution, which provides 1,2,3-diazaphosphole-substituted cyclotetraphosphines, isolated and characterized by X-ray crystal structure analysis. Transformation of the 10-π-electron heteropentalene system into a stabilized phosphinidene occurs when the P-N bond is lengthened
当前的研究提供了对退火3a,6a-diaza-1,4-diphosphapentalenes(DDPs)的化学性质的清晰理解,最好将其视为稳定的单线次膦化物。发现DDP在溶液中经历可逆的低聚反应,其提供了1,2,3-二氮杂磷取代的环四膦,通过X射线晶体结构分析对其进行了分离和表征。当PN键加长时,发生10-π电子杂戊烯系统向稳定的次膦基的转化,这是由弱路易斯酸和弱碱促进的。DFT计算表明,当NP键距达到2.53Å时,DDP的最低未占据分子轨道在磷原子上具有较高的定位。齐聚是浓度依赖性的过程。增加单体溶液的浓度会促进四聚体的形成,反之亦然:强烈稀释会导致形成单体。四聚体溶液是光敏的,并且在辐射时产生单体。合成了新的退火的DDP 2及其基于四氢萘醌嗪的二氯前体4。4以1,4-二氯异构体的形式固态存在,而在溶液中则得到1,1-和1,4-异构体的平衡混合物。环己酮退火的二氮杂二磷杂戊烯1与Ph3B