A Newly Synthesized Heterobimetallic NiII-GdIII Salamo-BDC-Based Coordination Polymer: Structural Characterization, DFT Calculation, Fluorescent and Antibacterial Properties

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Two new tetranuclear Ni II complexes, [Ni 4 (L 1) 2 (N 3) 4 (MeOH) 2 ]ÁCH 3 COCH 3 (1) and [Ni 4 (L 2) 2 (N 3) 4 (MeOH) 2 ]Á4CH 3 COCH 3 (2), were synthesized using NiCl 2 Á6H 2 O, NaN 3 , and asymmetric salamo-based ligands H 2 L 1 and H 2 L 2 , respectively. The structural characterization was made by elemental analyses, infrared (IR) and ultraviolet-visible (UV-vis) spectra, and X-ray diffraction analyses. The results of X-ray diffraction analyses show that the Ni II atoms in complexes 1 and 2 are distorted octahedral geometries. Interestingly, the degree of distortion of the ligands in complexes 1 and 2 is different, which indicates that the interaction of Ni II ions on different ligands is different. Meanwhile, the investigation of molecular packing by employing the Hirshfeld surface analysis exhibits that the percentages of C-H/H-C, O-H/H-O, and H-H/H-H contacts of the complex 1 (or 2) are calculated to be 17.7%, 7.9%, and 53.7% (or 18.8%, 13.8%, and 52.5%), respectively, where the H-H/H-H contacts have the characteristics of strong contacts whereas the O-H/H-O hydrogen bonds are considerably weak, and the studies on fluorescence properties further confirm the Ni II atoms have different binding abilities to the different ligands.

Section: Introductionmentioning

confidence: 99%

Influence of structural variation of salamo‐based ligand on supramolecular architectures, Hirshfeld analyses, and fluorescence properties of new tetranuclear Ni^II complexes

Tao

Feng

et al. 2020

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“…Other than that, there were two sets of intermolecular hydrogen bonds and a set of C–H⋯π interactions in the Co (II) complex, C21–H21B⋯O7, C42–H42C⋯O2, and C42−H42C⋯π, respectively (Figure 6). [ 55,56 ]…”

Section: Resultsmentioning

confidence: 99%

Investigation of mononuclear, dinuclear, and trinuclear transition metal (II) complexes derived from an asymmetric Salamo‐based ligand possessing three different coordination modes

Bian

Wang

et al. 2020

A new asymmetric Salamo-based ligand H 2 L was synthesized using 3-tert-butyl-salicylaldehyde and 6-methoxy-2-[O-(1-ethyloxyamide)]-oxime-1-phenol. By adjusting the ratio of the ligand H 2 L and Cu (II), Co (II), and Ni (II) ions, mononuclear, dinuclear, and trinuclear transition metal (II) complexes, [Cu(L)], [{Co(L)} 2 ], and [{Ni(L)(CH 3 COO)(CH 3 CH 2 OH)} 2 Ni] with the ligand H 2 L possessing completely different coordination modes were obtained, respectively. The optical spectra of ligand H 2 L and its Cu (II), Co (II) and Ni (II) complexes were investigated. The Cu (II) complex is a mononuclear structure, and the Cu (II) atom is tetracoordinated to form a planar quadrilateral structure. The Co (II) complex is dinuclear, and the two Co (II) atoms are pentacoordinated and have coordination geometries of distorted triangular bipyramid. The Ni (II) complex is a trinuclear structure, and the terminal and central Ni (II) atoms are all hexacoordinated, forming distorted octahedral geometries. Furthermore, optical properties including UV-Vis, IR, and fluorescence of the Cu (II), Co (II), and Ni (II) complexes were investigated. Finally, the antibacterial activities of the Cu (II), Co (II), and Ni (II) complexes were explored. According to the experimental results, the inhibitory effect was found to be enhanced with increasing concentrations of the Cu (II), Co (II), and Ni (II) complexes.

“…Among the recently studied salamo‐based complexes, it was found that Cu (II) complexes show excellent antibacterial activities. [ 71–73 ] The E. coli was selected as the test source to test the antibacterial ability of the ligand H 3 L and its complexes 1 and 2 . Three of the most common methods for test antibacterial properties are use of Oxford cup method, spread plate, and streak plate 74 .…”

Section: Applicationmentioning

confidence: 99%

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

Dou

Tong

et al. 2022

Two helical centrosymmetric homotetranuclear Cu (II) complexes, [Cu 4 (L) 2 (EtOH) 2 ](ClO 4 ) 2 Á2EtOHÁ2CHCl 3 (1) and [{Cu 4 (L) 2 (EtOH) 2 }{Cu 4 (L) 2 (HNO 3 ) 2 }] (NO 3 ) 4 Á3EtOHÁ3MeOH (2), were synthesized by the reactions of a symmetric bis (salamo)-based ligand H 3 L with Cu(ClO) 2 Á6H 2 O and Cu(NO) 3 Á3H 2 O, respectively, and certified by elemental analyses, UV-Visible absorption spectra, infrared spectra and single-crystal X-ray analysis techniques. X-ray crystal structure analyses reveal that four Cu (II) atoms of complex 1 are attached to two deprotonated ligand (L) 3À units with the help of two coordinated ethanol molecules, and then forming a helical centrosymmetric complex by H-bonding and πÁ Á Áπ interactions. While complex 2 unit cell contains two crystallographically independent but chemically identical homotetranuclear complexes (molecules A and B), eight Cu (II) atoms are coordinated by four deprotonated ligand (L) 3À units. The coordination mode of four Cu (II) atoms from molecule A is the same as complex 1; at the same time, oxygen atoms on nitrates are involved in the coordination of another four Cu (II) atoms from molecule B. The short-range interactions in complexes 1 and 2 were calculated by Hirshfeld surfaces analyses. The molecular orbital energy levels, molecular stabilities of complexes 1 and 2 were analyzed by DFT calculations. In addition, antibacterial assays were also investigated in detail.