Self-assembly of five cobalt(II) coordination polymers from 1,2-bis(1,2,4-triazol-1-yl)ethane

Five cobalt(II) coordination polymers {[Co(bte)2(H2O)2](NO3)2}n (1), {[Co(bte)(H2O)2(NCO)2](H2O)2}n (2), {[Co(bte)2(NCO)2](H2O)}n (3), [Co(bte)2(NCS)2]n (4) and {[Co(bte)(H2O)2(NCS)2][Co(bte)2(NCS)2]}n (5) (bte = 1,2-bis(1,2,4-triazol-1-yl)ethane) have been synthesized and characterized by elementary analyses, IR, thermogravimetric analyses and X-ray diffraction analyses. There are three motifs (2D (4,4) network, single chain and double-stranded chain) in five complexes: 2D (4,4) network (1), single chain (2), double-stranded chain (3 and 4), and a combination of two motifs (single chain + double-stranded chain) (5). A conformational analysis of the ligand molecule demonstrates that the flexibility of bte and the rotational freedom of the triazole rings result in the diversity of the topologies of the complexes.

Graphical abstractThere are three motifs (2D (4,4) network, single chain and double-stranded chain) in five complexes: 2D (4,4) network (1), single chain (2), double-stranded chain (3 and 4), and a combination of two motifs (single chain + double-stranded chain) (5).Figure optionsDownload full-size imageDownload as PowerPoint slide