Four new metal–organic frameworks constructed from H2DBTDC-O2 (H2DBTDC-O2 = dibenzothiophene-5,5′-dioxide-3,7-dicarboxylic acid) ligand with guest-responsive photoluminescence

Abstract

Four new metal–organic frameworks (MOFs): [Cd(L)(Py)₂]_n (1), [Zn₂(L)₂(4,4′-bipy)]_n (2), [Zn(L)(DIB)]_n (3), [Co(L)(2,2′-bipy)]_n (4), (H₂L = dibenzothiophene-5,5′-dioxide-3,7-dicarboxylic acid, Py = pyridine, 4,4′-bipy = 4,4′-bipyridine, 2,2′-bipy = 2,2′-bipyridine, DIB = 1,4-di(1H-imidazol-1-yl)butane) were constructed from H₂L, different metal ions in the presence of various N-donor co-ligands, under solvothermal conditions. 1 displays a 2D 4-connected layered structure and accumulates in ABAB type. 2 exhibits a 3D two-fold interpenetrated pcu uninodal network with a 6-connected (4¹²·6³) Schläfli symbol. 3 shows a parallel four-fold interpenetrated dia uninodal network with a 4-connected (6⁶) Schläfli symbol. Compound 4 is a 1D double-strand catenarian polymer. Solid-state properties for these crystalline materials, such as thermal stability, luminescent emission and the radiative lifetime of their emissions have been investigated. In particular, compounds 2 and 3 present guest-responsive luminescent properties.