Synthesis, structures, magnetic and fluorescent sensing properties of 1D Co(II)/Ni(II) coordination polymers

Two new coordination polymers [Co(L)(0.5)(1,4-bib)(H2O)(3)]n (1) and [Ni(L)(0.5)(1,4-bib)(H2O)(3)](n) (2) (H4L=1,4-bis (2,6-dimethyl-3,5-dicarboxypyridyl) benzene, 1,4-bib=1,4-bis(1-imidazolyl) benzene) were synthesized by hydrothermal method. Their structures were characterized by single crystal and powder X-ray diffraction, elemental analysis, infrared spectroscopic analysis, and thermogravimetric analysis. Structural analysis shows that complexes 1 and 2 are heterogeneous isomorphisms and 1D structures. The antiferromagnetic interaction between Co(II)/Ni(II) ions in complexes 1 and 2 was found by variable temperature magnetic susceptibility measurement. In addition, complex 1 can be used to detect cefixime (CEF) by fluorescence quenching method, and complex 2 can be used to detect tetracycline (TET). This method had high sensitivity and good selectivity, and their detection limits were 0.86 mu mol center dot L-1 (CEF) and 0.49 mu mol center dot L-1 (TET), respectively. CCDC: 2201063, 1; 2201064, 2.