A series of POM/Ag-based hybrids: distinct forms and assembly of [AgxLy] complexes through combinational effects of POM and isomeric ligands

Five POM/Ag-based hybrids were obtained under hydrothermal conditions: (AgLa)(2)[Ag2L2a(SiW12O40)](1), [(AgLb)(2)-Ag2L2b][(SiW12O40)] (2) Na-2[AgLa(HLa)](2)[Ag5L4a(H2O)(2)][H(P2W18O62)(2)]center dot 21.6H(2)O (3), [Ag5L5b][K2(OH)P2W18O62]center dot H2O (4) and [Ag2L2a][HPW12O40]center dot 7.5H(2)O (5) (L-a = 1,2-bis(imidazol-1-ylmethyl)benzene; L-b = 1,3-bis(imidazol-1-ylmethyl)benzene). It is likely that the forms and assembly of [AgxLy]complexes are crucial to the eventual structures, which are quite dependent on the POM and isomeric ligands in combination. Compound 1 shows a S-like chain structure with [(AgLa)(2)](n)(2n+) templates, while compound 2 features a unique 2D layer constructed by polypseudo-rotoxane motifs and infinite Ag chains. Compound 3 exhibits a 2D layer consisting of {Dawson-Ag-5} double chain and [AgL2a] complexes. Compound 4 possesses a 3D poly-threading framework containing {POM-K} chains and interdigitated metal-organic layers. Compound 5 is a 1D chain, formed by Keggin anions and [Ag2L2a]circles. Further, the luminescent and electrochemical properties of 1-5 are also investigated.