科研之友
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摘要
Two ligands, 2-{5,5-dimethyl-3-[2-(pyridin-3-yl)-ethenyl]cyclohex-2-enylidene}propanedinitrile (L1) and 2-{5,5-dimethyl-3-[2-(pyridin-2-yl)-ethenyl]cyclohex-2-enylidene}propanedinitrile (L2), were synthesized. By reaction of mercury thiocyanate with L1 and L2, respectively, coordination polymers [Hg(L1)((1,3)-SCN)(2)](n) (1), [Hg(L1)(2)((1,3)-SCN)(2)](n) (2), and [Hg(L2)((1,3)-SCN)(SCN)](n) (3) with different structures and topologies were obtained. In 1, the thiocyanate shows (1,3)-SCN bridging coordination, and adjacent Hg(II) ions are bridged by two (1,3)-SCN ions to form an infinite chain with the remaining position of five-coordinate Hg(II) occupied by L1. In 2, the thiocyanate has the same coordination as 1. However, Hg(II) has octahedral coordination with two L1 involved in coordination. An unusual feature of 3 is the presence of two types of thiocyanates, one has a S-terminal ligand and the other has a (1,3)-SCN bridge. The mercury(II) in 3 is four-coordinated by L2 and three thiocyanates. Luminescent properties and thermal stabilities of 1-3 were studied.
