Four Coordination Polymers Based on 5-Tert Isophthalic Acid and Rigid Bis(imidazol-1yl)benzene Linkers: Synthesis, Luminescence Detection of Acetone and Optical Properties

Abstract

Four coordination polymers including, [Co(µ-Htbip)<inf>2</inf>(µ-dib)]<inf>n</inf> (1), [Co(µ-tbip)(µ-dmib)<inf>0.5</inf>]<inf>n</inf> (2), [Zn<inf>2</inf>(µ-tbip)(µ<inf>3</inf>-tbip)(µ-dmib)<inf>1.5</inf>]<inf>n</inf> (3) and [Cd(µ<inf>3</inf>-tbip)(µ-dib)<inf>0.5</inf> (H<inf>2</inf>O)]<inf>n</inf> (4) (tbip: 5-tert-butylisophthalate, dib: 1,4-bis(imidazol-1yl)benzene, dmib: 1,4-bis(imidazol-1yl)-2,5-dimethylbenzene), were hydrothermally synthesized and characterized by elemental analysis, IR spectra, single crystal and powder X-ray diffraction and thermal analysis (TG/DTA). The structural diversity is observed depending on ligands and coordination number of metal centers in the synthesized complexes. The tbip ligand displayed five different coordination modes in its complexes. In 1 and 2, complex 1 is 3D framework with the dia topology while complex 2 has 2D structure with the sql topology depending on coordination geometries of Co ions. Complex 3 is 3D framework with the fsh 4,6-conn topology and complex 4 has 2D 4-connected sql topology. Photoluminescent properties of complex 3 dispersed in various organic solvents were investigated and the results showed that 3 dispersed in methanol could be used as a fluorescent sensor for the detection of acetone. Moreover, thermal and optical properties of the complexes were also studied. © 2017 Elsevier Inc.