Synthesis, Crystal Structure and Fluorescence Property of Ag(I) Complex with Schiff Base N,N′-Bis(3-pyridinecarboxaldehyde)-(1R,2R)-cyclohexanediimine Ligand

The Schiff base ligand L-1 (N,N'-bis(3-pyridinecarboxaldehyde)-(1R,2R)-cyclohexanediimine) was synthesized from the condensation reaction of (1R,2R)-1,2-cyclohexanediamine with 3-pyridinecarboxaldehyde. AgNO3 reacted with L-1 to give the complex [Ag(L-1)(NO3)](n) (1), which was characterized by elemental analysis, FT-IR, single crystal X-ray diffraction, thermogravimetric Analysis (TGA) and powder X-ray diffraction. In the complex, the coordination environment of Ag(I) adopted a distorted tetrahedral geometry, being bound to one oxygen donor from a monodentate nitrate anion as well as to nitrogen atoms and imine nitrogen atoms from three adjacent molecules of L-1. In compound 1, the L-1 ligands coordinated to the Ag(I) ions in two different ways. The first involved L-1 bridging of Ag(I) centers in a bidentate fashion via the two terminal pyridyl N-donors only. The other binding mode involved L-1 coordination to Ag(I) ions in a tetradentate mode through both terminal pyridyl N-donors and both amine nitrogen atoms. In this mode, the complex 3D porous structure of 1 was formed. At the same time, the fluorescent properties of ligand and complex 1 are investigated in the solid state at room temperature. CCDC: 969699, L-1; 969700, 1.