科研之友
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摘要
Synthesis and structural behaviours of a pyridine-containing NO2S2-macrocycle L and its soft metal complexes 1-4 with different types of coordination modes and topologies are presented. The reactions of L with AgPF6 in different ligand-to-metal ratios lead to the formation of two solid complexes with different topologies: an endocyclic 1 : 1 (L : M) complex 1a and an unprecedented 2 : 1 endo/exo-type complex 2. NMR titrations confirm that both silver(I) complexes with 1 : 1 and 2 : 1 ratios also retain in solution. In the reactions of L with HgCl2 and Hg(ClO4)(2), anion-controlled exo- and endocyclic 1 : 1 complexes were afforded, respectively. The tendency to adopt this respective arrangement suggests the possibility that metal coordination modes and/or topologies including the stoichiometries can be controlled by varying ligand-to-metal ratios and anions.
- 出版日期2010
