Three resorcin[4]arene-based complexes with Cu(ii)-exchange characteristics and fluorescence sensing of polyoxometalates in aqueous solutions†
Abstract
Three new resorcin[4]arene-based coordination polymers, [Cd3L(H2L)(H2O)2]·2DMF·11.5H2O (1), [Zn4L2(H2O)4]·2DMF·10H2O (2) and [Mn9L4(HCOO)2(H2O)12·(DMF)2]·2DMF·10H2O (3) (H4L = tetrakis(ω-carboxybutyl)methylene resorcin[4]arene, DMF = N,N′-dimethylformamide), have been solvothermally synthesized. Compounds 1–3 are all bilayer structures constructed by secondary building units (SBUs), where trinuclear clusters are found in 1 and infinite rod-shaped chains are observed in 2 and 3. Strikingly, compounds 1–3 display partial Cu(II)-exchange characteristics. The solid-state emission spectra and fluorescence sensing abilities of 1 and 2 to detect polyoxometalates (POMs) in aqueous solutions were studied.