Active Nature of Primary Amines during Thermal Decomposition of Nickel Dithiocarbamates to Nickel Sulfide Nanoparticles
作者:Nathan Hollingsworth、Anna Roffey、Husn-Ubayda Islam、Maxime Mercy、Alberto Roldan、Wim Bras、Mariette Wolthers、C. Richard A. Catlow、Gopinathan Sankar、Graeme Hogarth、Nora H. de Leeuw
DOI:10.1021/cm503174z
日期:2014.11.11
amounts of [NiS2CN(H)Hex}2] are formed prior to decomposition, but with oleylamine, exchange is slower and [Ni(S2CNBui2)S2CN(H)Oleyl}] is the active reaction component. The primary amine dithiocarbamate complexes decompose rapidly at ca. 100 °C to afford nickel sulfides, even in the absence of primary amine, as shown from thermal decomposition studies of [NiS2CN(H)Hex}2]. DFT modeling of [NiS2CN(H)R}2]
尽管[Ni(S 2 CNBu i 2)2 ]在多种溶剂中在高温下稳定,但在145°C的油胺中会发生溶剂热分解,从而生成纯的NiS纳米颗粒,而在正己胺中的120°C会发生溶剂热分解。 Ni 3 S 4(多水银)和NiS结果。结合实验和理论研究,可以深入了解分解过程,并可以用来解释观察到的差异。当在伯胺溶解,八面体反式- [镍(S 2 CNBu我2)2(RNH 2)2 ]结果如图原位XANES和EXAFS,并通过DFT计算得到证实。加热到90–100°C会导致发生与酰胺交换产物[Ni(S 2 CNBu i 2)S 2 CN(H)R}]和/或[Ni S 2 CN(H )R} 2 ]。DFT建模显示,交换是通过伯胺在二硫代氨基甲酸酯配体的主链碳上的亲核攻击而发生的。使用己胺,酰胺交换很容易,并且在分解之前会形成大量的[Ni S 2 CN(H)Hex} 2 ],但是使用油胺时,交换较慢,[Ni(S