A Family of Metal–Organic Frameworks with a New Chair-Conformation Resorcin[4]arene-Based Ligand: Selective Luminescent Sensing of Amine and Aldehyde Vapors, and Solvent-Mediated Structural Transformations

Abstract

By utilizing a new chair-conformation resorcin[4]arene-based octacarboxylate ligand, four functional metal–organic frameworks (MOFs), namely, [(CH3)2NH2]4[Cd2(L)]·4H2O (1), [(CH3)2NH2]4[Zn2(L)]·2DMF·6H2O (2), [(CH3)2NH2]4[Co2(L)]·2DMF·4H2O (3), and [(CH3)2NH2]2[Co3(L)(H2O)12] (4) (H8L = 2,8,14,20-tetra-methylphenyl-4,6,10,12,16,18,22,24-octa-carboxymethoxy-resorcin[4]arene and DMF = N,N-dimethylformamide), were solvothermally synthesized and structurally characterized. In 1, each L8– anion bridges eight Cd(II) atoms to give a three-dimensional (3D) (4,8)-connected (46)(412.610.86) framework. In isostructural 2 and 3, each L8– anion links eight adjacent Zn(II) or Co(II) atoms to yield a 3D (4,8)-connected (46)(411.612.85) net. In 4, each L8– anion only bridges four Co(II) atoms by using its four carboxylates each in a monodentate coordination mode to generate an infinite one-dimensional (1D) chain. Remarkably, the highly selective luminescent sensing of amine and aldehyde vapors was studied for 1 and 2 as ...