Mononuclear Zn(II) and trinuclear Ni(II) complexes derived from a coumarin-containing N2O2 ligand: Syntheses, crystal structures and fluorescence properties

• Published in: Polyhedron 2018-01, Vol.139, p.7-16
• Main Authors: Gao, Lei, Wang, Fei, Zhao, Qing, Zhang, Yang, Dong, Wen-Kui
• Format: Article
• Language: English
• Subjects: Complex; Coumarin-containing N2O2 ligand; Crystal structure; Fluorescent property; Synthesis
• ISSN: 0277-5387
• DOI: 10.1016/j.poly.2017.10.004

Two newly designed fluorescent complexes, [Zn(L)(MeOH)]·CH2Cl2 (1) and [{NiL(MeOH)(μ-OAc)}2Ni]·4CH2Cl2 (2) based on a coumarin-containing Salamo-type chelating ligand (H2L) have been synthesized and characterized structurally. The complex 1 forms an infinite 2D supramolecular network, while complex 2 forms a 3D supramolecular structure. The fluorescence properties of complexes 1 and 2 were investigated, and they exhibits unique fluorescent emissions in different solvents. [Display omitted] Two newly designed fluorescent complexes, [Zn(L)(MeOH)]·CH2Cl2 (1) and [{NiL(MeOH)(μ-OAc)}2Ni]·4CH2Cl2 (2) based on a coumarin-containing N2O2 chelating ligand H2L have been synthesized and characterized by elemental analyses, IR and UV–Vis spectra, fluorescence spectra and X-ray crystallography. Complex 1 includes one Zn(II) atom, one completely deprotonated (L)2− unit, one coordinated methanol molecule and one crystalling dichloromethane molecule, and forms an infinite 2D supramolecular network. While complex 2 contains three Ni(II) atoms, two completely deprotonated (L)2− units, two μ2-acetate ions, two coordinated methanol molecules and four crystalling dichloromethane molecules, and possesses an infinite 3D supramolecular structure. The fluorescence titration experiment is used to characterize fluorescence properties of complexes 1 and 2. The normalized fluorescent spectra show clearly that complexes 1 and 2 have favorable fluorescent emissions in different solvents.