The most widely studied spin crossover (SCO) systems are those involving hexacoordinate iron(II) complexes immerse in the “magic” N₆ coordination sphere. In this review the properties of SCO-active metal complexes containing unusual metal centres and/or coordination spheres are analysed, except for Fe³⁺ complexes that have been recently reviewed. The SCO-properties of the less studied SCO metal centres Cr²⁺, Mn²⁺, Mn³⁺ and Co²⁺ are presented, showing great advances in the development of bistable materials containing first row transition metals other than Fe. Finally, an analysis of the changes in the structural parameters, bond lengths and angles, during the spin conversion is presented for those complexes structurally characterised by X-ray crystallography in both high- and low-spin states.

研究最广泛的自旋交叉（SCO）系统是涉及浸入“魔术” N ₆配位球中的六配位铁（II）配合物的系统。在这篇综述中，分析了含有异常金属中心和/或配位球的SCO活性金属配合物的性能，但最近已对Fe ³⁺配合物进行了分析。研究较少的SCO金属中心Cr 2 ⁺，Mn 2 ⁺，Mn ³⁺和Co ²⁺的SCO性质提出，表明了在开发除铁以外的第一行过渡金属的双稳态材料方面的巨大进展。最后，对在自旋转换过程中在高和低自旋状态下通过X射线晶体学表征的那些配合物的结构参数，键长和角度的变化进行了分析。