Synthesis and Thermally and Light Driven Cleavage of an N‐Heterocyclic Diphosphine with Inorganic Backbone
作者:Markus Blum、Christoph M. Feil、Martin Nieger、Dietrich Gudat
DOI:10.1002/zaac.202000252
日期:2021.2.24
carbon‐free “inorganic” 1,3,2,4,5‐diazaphosphadisilolidine rings was prepared by reductive coupling of a P‐chloro‐substituted monocyclic precursor molecule. VT‐EPR studies revealed that the diphosphine exists in solution, like other compounds of this kind, in dynamic equilibrium with the corresponding phosphinyl radicals. Determination of the radical concentration from the EPR spectra permitted to calculate
通过还原偶联一个P-氯取代的单环前体分子,制备了一个具有无支撑PP键的二膦连接两个无碳的“无机” 1,3,2,4,5-二氮杂磷二甲硅烷基环。VT-EPR研究表明,与其他此类化合物一样,二膦与相应的次膦酰基基团动态平衡存在于溶液中。由EPR光谱确定自由基浓度可以计算出均相PP键裂变的热化学参数。结果表明,解离的焓和熵都高于拓扑相关的双(二氮杂膦烷)。熵项的影响可以解释为,无论是否存在能量上相当稳定的PP键,即使在环境温度下也可以观察到解离的开始。