Institut de Physique et de Chimie des Matériaux-Université de Strasbourg23, Rue du Loess, BP 43, F-67034 Strasbourg, France.
Dalton Trans. 2019 Oct 22;48(41):15321-15337. doi: 10.1039/c9dt02085c.
The spin-crossover (SCO) phenomenon is one of the most prominent examples of bi-stability in molecular chemistry, and the SCO complexes are proposed for nanotechnological applications such as memory units, sensors, and displays. Since the discovery of the SCO phenomenon in tris(N,N-dialkyldithiocarbamato)iron(iii) complexes, numerous investigations have been made to obtain bi-stable SCO complexes undergoing spin-state switching at or around room temperature (RT). Valiant efforts have also been made to elucidate the structure-property relationship in SCO complexes to understand the factors-such as ligand-field strength, molecular geometry, and intermolecular interactions-governing the SCO. Schiff base ligands are an important class of nitrogen-rich chelating ligands used to prepare SCO complexes, because the Schiff base ligands are easy to synthesize and tailor with additional functionalities. Iron(ii)-Schiff base SCO complexes are a well-studied class of SCO active complexes due to the propensity of the complexes to undergo bi-stable SCO. In this context, this perspective attempts to elucidate the structure-SCO property relationships governing SCO in selected mono-, bi-, and multi-nuclear iron(ii)-Schiff base complexes.
自旋交叉（SCO）现象是分子化学中最突出的双稳态现象之一，SCO 配合物被提议用于纳米技术应用，如存储单元、传感器和显示器。自从在三（N，N-二烷基二硫代氨基甲酸盐）铁（III）配合物中发现 SCO 现象以来，已经进行了大量的研究以获得在室温（RT）或接近室温下进行自旋态切换的双稳态 SCO 配合物。人们还做出了巨大的努力来阐明 SCO 配合物中的结构-性质关系，以了解控制 SCO 的因素，如配体场强度、分子几何形状和分子间相互作用。席夫碱配体是一类重要的富氮螯合配体，用于制备 SCO 配合物，因为席夫碱配体易于合成，并可以通过添加额外的官能团进行定制。由于配合物易于发生双稳态 SCO，因此铁（II）-席夫碱 SCO 配合物是一类研究得很好的 SCO 活性配合物。在这种情况下，本观点试图阐明在选定的单核、双核和多核铁（II）-席夫碱配合物中控制 SCO 的结构-SCO 性质关系。
