Syntheses, Crystal Structures and Fluorescence Properties of Co(II) Coordination Polymers Based on Anion Regulation Strategy

Two coordination polymers [Co(L)Cl-2](n) (1) and [Co(L)(2)(SCN)(2)](n) (2) were obtained by using 4-methyl-2,6-bis(pyridin-3-ylethynyl) aniline (L) and Co(II) salts in CH2Cl2/MeOH mixed solvent under room temperature. The complexes 1 and 2 were characterized by IR, elemental analysis and X-ray single crystal diffraction. The structural analysis revealed that complex 1 has 1D chain structure and 2 has 2D plane structure. The reason of the structure difference was anion choice because the L in both of the coordination complexes adopts almost same trans-N,N donor configuration. Complex 1 has four-coordinated Co(II)) which coordinated to two L molecules, while complex 2 has six-coordinated Co(II) which coordinated to four L molecules. The XRD and fluorescence property of two complexes were investigated. Compared to the emission spectrum of L, the emission maximum of the complex 1 was red shift and 2 was blue shift. CCDC: 1869513, 1; 1869512, 2.