Synthesis, structures and selective luminescence sensing of cobalt(II) and copper(II) coordination architectures with 5,5'-(diazene-1,2-diyl)diisophthalic acid and 1,10-phenanthroline

Co(II) and Cu(II) complexes, [Co2(H2L)2(phen)2(H2O)4](H2O)2 (1) and [Cu2(L)0.5(phen)2Cl2]n (2) [H4L = 5,5'-(diazene-1,2-diyl)diisophthalic acid, phen = 1,10-phenanthroline], have been solvothermally synthesized by a mixed-ligand strategy and structurally characterized by elemental analyses, IR spectra and X-ray diffraction (XRD) analyses. Single crystal XRD analyses indicate that 1 and 2 exhibit a binuclear structure and a 1D chain structure, respectively. The results reveal that the coordination configuration of M(II) has a pivotal part in formation of final structures. Moreover, they can conditionally detect Fe3+ through luminescence quenching. In addition, 1 can also detect Cr2O72− ions in the absence of S2− and H2P2O72− ions.