Two cobalt coordination polymers with a highly undulated 2-D network and a 2-D (4,4) network

Abstract

Two cobalt(II) coordination polymers [Co3(ttmb)2(H2O)6Cl6] · 3H2O (1) and Co(ttmb)2(H2O)2](NO3)2 · 4H2O (2) were synthesized by the reaction of 1,3,5-tri(1,2,4-triazol-1-ylmethyl)-2,4,6-trimethylbenzene (ttmb) and CoCl2 or Co(NO3)2. In 1, each ttmb shows a tri-monodentate coordination mode and bonds three Co(II)s to form a highly undulated 2-D network. The Schläfla symbol for the 2-D network is 3262. The highly undulated 2-D networks are not catenated, but interdigitate each other. In 2, each ttmb shows a two-monodentate coordination mode and connects two Co(II)s to extend a 2-D (4,4) network. The ttmb exhibits the cis,cis,cis-conformation in 1 and the cis,trans,trans-conformation in 2. The thermal stability of 1 was studied.