Endo- and/or exocyclic silver(i) and mercury(ii) complexes of an NO2S2-macrocycle: effect of ligand ratio and anion

• DOI: 10.1039/b921033d
• Publication Date: 2010-01-07T14:30:21Z
• Authors: Hyun Jee Kim; Kaniz Fatima Sultana; Jai Young Lee; Shim Sung Lee
• Keywords: 01 natural sciences; 0104 chemical sciences

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.