Two cobalt(II) coordination polymers [Co 3 (ttmb) 2 (H 2 O) 6 Cl 6 ] Á 3H 2 O (1) and Co(ttmb) 2 (H 2 O) 2 ](NO 3 ) 2 Á 4H 2 O (2) were synthesized by the reaction of 1,3,5-tri(1,2,4-triazol-1-ylmethyl)-2,4,6-trimethylbenzene (ttmb) and CoCl 2 or Co(NO 3 ) 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 Schla¨fla symbol for the 2-D network is 3 2 6 2 . 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.
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