Insight into Rare Structurally Characterized Homotrinuclear CuII Non-Symmetric Salamo-Based Complex

Abstract

A rare homotrinuclear CuII salamo-based complex [Cu3(L)2(μ-OAc)2(H2O)2]·2CHCl3·5H2O was prepared through the reaction of a non-symmetric salamo-based ligand H2L and Cu(OAc)2·H2O, and validated by elemental analyses, UV-Visible absorption, fluorescence and infrared spectra, molecular simulation and single-crystal X-ray analysis techniques. It is shown that three CuII atoms and two wholly deprotonated ligand (L)2− moieties form together a trinuclear 3:2 (M:L) complex with two coordination water molecules and two bi-dentate briging μ-acetate groups (μ-OAc−). Besides, the Hirshfeld surface analysis of the CuII complex was investigated. Compared with other ligands, the fluorescent strength of the CuII complex was evidently lowered, showing that the CuII ions possess fluorescent quenching effect.

Exploring two helical centrosymmetric homotetranuclear Cu (II) bis (salamo)‐based complexes

“…Furthermore, there are two isoabsorption points occurred around 332 and 361 nm. These results could also further certify the formation of new species 63 …”

An investigation of structure, Hirshfeld surface, and fluorescence properties of two dinuclear Ni (II) and Zn (II) salamo‐type complexes

“…The Ni (II) atom (Ni1) of 1 A molecule is in a hexa‐coordinated N 2 O 4 coordination environment, and four of the equatorial sites about the Ni1 center are occupied by the donor atoms (N1, N3, O1 and O6) of the ligand (L) 3− unit, while the remaining available axial areas are occupied by O14 atom of the methanol molecule and O13 atom of μ ‐OAc − counteranion, respectively, finally, the distorted octahedron geometry around the Ni1 is formed (Figure 3b). [ 22,50 ] At the same time, although, the Ni (II) atom (Ni1) is located in the N 2 O 4 (N4, N5, O1, O6, O9, and O12) coordination environment, the equatorial sites of distorted octahedral geometry of the Ni2 atom is not the usual N 2 O 2 chelating cavity similar to the Ni1 atom. For the Ni2 atom, four of the equatorial sites about the Ni2 center are occupied by the donor atoms (N4, N5, O1, and O6) of the ligand (L) 3− unit, O9 atom of the 5‐nitrosalicylic aldehyde is not in equatorial site, but participates in the coordination in the axial area, and the other axial area is O13 atom of μ ‐OAc − counteranion (Figure 3c).…”

“…Recent years, a new type of salen‐based analogue, salomo‐based ligands (R‐CH=N‐O‐[CH 2 ] n ‐O‐N=CH‐R) were developed. [ 22–30 ] Due to the electronegativity of the oxygen atoms, which can significantly affect the reversible reaction of the imine bond, salomo‐based compounds with specific functions [ 31–37 ] and novel structures were synthesized. [ 38–45 ] With the continuous deepening and expansion of their research, a lot of 3d, [ 46–50 ] 3d‐s, [ 51 ] 3d‐4f [ 52–55 ] complexes have been synthesized by coordination‐driven self‐assembling, at the same time, the fast and efficient chemical probes have also been developed.…”