The reaction of [Cu(valen)] with Tb(NO3)3 and (Bu3NH)3[W(CN)8] affords two types of crystals: [{W(CN)8}Cu(valen)Tb(OH2)5]·2H2O (1, a discrete trinuclear complex) and [{W(CN)8}Cu(valen)Tb(OH2)4]·CH3CN·H2O (2, an infinite zig-zag chain), both compounds showing slow relaxation of the magnetization (H2valen is the
![Graphical abstract: Self-assembly of [CuIITbIII]3+ and [W(CN)8]3− tectons: a case study of a mixture containing two complexes showing slow-relaxation of the magnetization](http://hg.y866.cn/compound/lib/scimg/usr/1/C2DT32081A.jpg)