Abstract
A unprecedented hetero-bimetallic 3d-4f BDC-salamo-based coordination polymer, [(L)Ni(BDC)Gd(NO3)(DMF)] was prepared and validated via elemental analyses, IR and UV–Visible absorption spectra, DFT calculation, and X-ray crystallography. The six-coordinated Ni1 ion lies at the N2O2 donor site of the L2− moiety, and one DMF O atom and carboxylate O atom occupy, collectively, the axial positions, and form a twisted octahedron. The nine-coordinated Gd1 ion consists of three oxygen atoms (O12, O13, and O14) of two carboxylate groups, two oxygen atoms (O8 and O9) derived from one bidentate nitrate group, and an O2O2 coordination site (O1, O2, O6, and O5) of the L2− unit, forming a twisted three-capped triangular prism coordination geometry. Compared to the ligand (H2L), the fluorescence intensity decreases due to the coordination of metal ions. Meanwhile, the antibacterial activities are researched.
Highlights
The salen-like compounds are an important class of Schiff bases having a C2 axis of symmetry [1,2,3,4,5], and the coordinating group of the salen-like ligands mostly contain two Schiff base N and phenol O atoms on the skeleton [6,7,8,9,10,11] which constitutes a tetradentate N2 O2 coordination cavity, and is easy to bind with transition metal ions, alkaline earth metal ions, and rare earth metal ions to obtain various metal complexes such as mononuclear, binuclear, multinuclear, and heteropolynuclear complexes [12,13,14,15,16,17]
The salamo-like ligands are a very important kind of versatile chelating bisoxime ligands including N2 O2 -donor cavity [47]. These ligands are synthesized by structural modification of the salen-like ligands, and are generally coordinated with metal ions to obtain multinuclear metal complexes
It is generally true that the self-assembly process of organometallic complexes is frequently used to construct metal organic framework (MOF) materials [59]
Summary
The salen-like compounds are an important class of Schiff bases having a C2 axis of symmetry [1,2,3,4,5], and the coordinating group of the salen-like ligands mostly contain two Schiff base N and phenol O atoms on the skeleton [6,7,8,9,10,11] which constitutes a tetradentate N2 O2 coordination cavity, and is easy to bind with transition metal ions, alkaline earth metal ions, and rare earth metal ions to obtain various metal complexes such as mononuclear, binuclear, multinuclear, and heteropolynuclear complexes [12,13,14,15,16,17]. The salamo-like ligands are a very important kind of versatile chelating bisoxime ligands including N2 O2 -donor cavity [47]. These ligands are synthesized by structural modification of the salen-like ligands, and are generally coordinated with metal ions to obtain multinuclear metal complexes. Transition metal complexes of salamo-based compounds have aroused wide concern on their photophysical properties and reported successively [51,52,53,54,55,56,57], and heterobimetallic 3d-4f salamo-like complexes, especially containing auxiliary ligands, have rarely been reported [58]. The paper introduces DFT calculations to study the electronic structure and properties of the polymer
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