Two phenoxo- and cyanido-bridged one-dimensional complexes NiII2GdIII2FeIII3 (1) and NiII2DyIII2FeIII3 (2) have been prepared. They are the first pentacyanidoferrite-bridged heterotrimetallic complexes. Magnetic studies reveal that overall ferromagnetic interactions are present in complexes 1 and 2, and complex 2 shows single-molecule magnet (SMM) behaviour with an energy barrier of 14.8 K.
![Graphical abstract: Heterotrimetallic Ni2Ln2Fe3 chain complexes based on [Fe(1-CH3im)(CN)5]2−](http://hg.y866.cn/compound/lib/scimg/usr/1/D1DT00693B.jpg)
