Abstract
An unprecedented dinuclear CuII complex, [Cu2(L2)2], derived from a salamo-like chelating ligand H2L2, was produced by the cleavage of a newly synthesized, half-salamo-like ligand HL1 (2-[O-(1-ethyloxyamide)]oxime-3,5-dichloro-phenol). This was synthesized and characterized by elemental analyses, IR, UV–Vis and fluorescent spectra, single crystal X-ray diffraction analysis, and Hirshfeld surface analysis. X-ray crystallographic analysis indicated that the two CuII (Cu1 and Cu2) ions bore different (N2O3 and N2O2) coordination environments, the penta-coordinated Cu1 ion possessed a slightly twisted tetragonal pyramid geometry with the τ value τ = 0.004, and the tetra-coordinated Cu2 ion showed a slightly twisted square planar geometry. Interestingly, one oxime oxygen atom participated in the coordination reported previously. Moreover, an infinite two-dimensional layered supramolecular network was formed. Compared with HL1, the CuII complex possessed the characteristic of fluorescence quenching.
Highlights
Salen-like ligand and its derivatives (R–CH=N–(CH2 )n –N=CH–R) have received extensive attention in the field of coordination chemistry in the past decades
They can coordinate with alkaline earth, rare earth, and d-block transition metal ions to form stable mononuclear or multinuclear metal coordination compounds [1,2,3,4,5]
X-ray structure data was collected by a CCD surface detecting diffractometer (Bruker, Germany), and Mo-Kα (λ = 0.71073 Å) ray radiation was monochromated with graphite, IR spectra were recorded on a VERTEX 70 spectrophotometer with samples prepared as KBr (500–4000 cm−1 ) from Bruker, Germany, UV–Vis spectra were measured on a UV-3900 spectrophotometer from Hitachi, Tokyo, Japan, fluorescence spectra were recorded on a F-7000 FL 220-240V spectrophotometer from Hitachi, Tokyo, Japan, and Hirshfeld surface analysis of the CuII complex was performed using the Crystal Explorer program were all made according to similar methods previously reported [56]
Summary
Salen-like ligand and its derivatives (R–CH=N–(CH2 )n –N=CH–R) have received extensive attention in the field of coordination chemistry in the past decades. The salamo-like ligands and their metal complexes have special properties and potential applications They are widely used in the fields of magnetic materials [18,19,20,21], electrochemistry [22,23,24,25], catalysis [26,27,28,29,30], luminescence [31,32,33,34,35,36], ion recognition [37,38,39,40], biological antibacterial [41,42,43], and supramolecular architecture [44,45,46,47,48,49]. The fluorescence property and Hirshfeld surface analysis of the CuII complex were studied [54]
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