Construction of novel hexanuclear Co(II) and dinuclear Ni(II) bis(salamo)‐type complexes

Two novel homomultinuclear complexes [Co6(L)2(μ‐OAc)4]·2CHCl3·CH3COCH3 (1) and [Ni2(L)(H2O)2(Py)2]·2CHCl3 (2) with a newly designed rigid bis(salamo)‐type tetraoxime ligand (H4L) were synthesized and characterized by elemental analyses, Fourier transform infrared (FT‐IR) spectra, UV–Vis absorption s...

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Bibliographic Details
Published in:Applied organometallic chemistry 2022-02, Vol.36 (2), p.n/a
Main Authors: Feng, Shan‐Shan, Li, Li‐Li, Li, Peng, Dong, Wen‐Kui
Format: Article
Language:English
Subjects:
Absorption spectra
Chemistry
complex
Coordination
crystal structure
Fluorescence
fluorescence property
Fourier transforms
Hirshfeld surface analysis
Infrared analysis
Infrared spectra
Ligands
rigid bis(salamo)‐type ligand
Titration
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Summary:Two novel homomultinuclear complexes [Co6(L)2(μ‐OAc)4]·2CHCl3·CH3COCH3 (1) and [Ni2(L)(H2O)2(Py)2]·2CHCl3 (2) with a newly designed rigid bis(salamo)‐type tetraoxime ligand (H4L) were synthesized and characterized by elemental analyses, Fourier transform infrared (FT‐IR) spectra, UV–Vis absorption spectra, and X‐ray single‐crystal diffractions. Complex 1 is a novel triple‐decker symmetrical six‐core cluster structure with twofold axis and inversion center. The Co(II) atoms were sandwiched between the bis(salamo)‐type ligands and possess two different geometries of distorted tetragonal pyramid and octahedron, respectively. Complex 2 possesses a dinuclear structure and the Ni(II) atoms are located in the N2O2 cavities of the ligand, and axial coordination atoms come from the coordinated water and pyridine molecules. Both Ni(II) atoms adopt distorted octahedral geometries. The interactions were quantitatively determined by Hirshfeld surfaces analyses of complexes 1 and 2. The coordination ratios were determined by studying the fluorescence properties of complexes 1 and 2. The results of fluorescence titration experiment show that the metals to ligand binding ratios are 6:2 and 2:1 for complexes 1 and 2, respectively. Two novel homomultinuclear complexes [Co6(L)2(μ‐OAc)4]·2CHCl3·CH3COCH3 (1) and [Ni2(L)(H2O)2(Py)2]·2CHCl3 (2) with a newly designed rigid bis(salamo)‐type tetraoxime ligand H4L were synthesized and characterized structurally. Complexes 1 and 2 showed strong fluorescence quenching, but the shapes and positions of the emission bands remain unchanged.
ISSN:0268-2605
1099-0739
DOI:10.1002/aoc.6501