Synthesis, crystal structures and spectral characterization of trans-bisaquabis(o-vanillinato)copper(II), cis-aquabis(o-vanillinato)copper(II) and aqua[bis(o-vanillinato)-1,2-ethylenediimin]copper(II)

Odabaşoğlu, Mustafa; Arslan, Figen; Ölmez, Halıs; Büyükgüngör, Orhan

doi:10.1016/j.dyepig.2006.06.033

Cited by 47 publications

(12 citation statements)

References 24 publications

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“…In the first step, Ni(II) and Cu(II) have been used to bind to the N 2 O 2 cavity of L, yielding literature-known compounds 83−86 LNi and LCu, used further as ligands for alkali metal ions (detailed data on all the individual titrations can be found in the Supporting Information, Figures S2−S4). Solid state structures of the compounds LCu and LNi obtained as single crystals confirm the binding of the metal ions in the N 2 O 2 pocket of the Ω-shaped ligand 45,87,88 ( Figure S1). The difference between the two complexes is that in LCu, a water molecule coordinates the copper ion in order to yield a square pyramidal environment, while the nickel ion in LNi remains with a square planar coordination.…”

Section: ■ Results and Discussionmentioning

confidence: 84%

Threading Salen-type Cu- and Ni-Complexes into One-Dimensional Coordination Polymers: Solution versus Solid State and the Size Effect of the Alkali Metal Ion

Finelli

Hérault

Crochet

et al. 2018

Crystal Growth & Design

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Compartmentalization of metal ions is crucial in biology as well as in materials science. For the synthesis of single source precursors, the preorganization of different metal ions is of particular interest for the lowtemperature generation of mixed metal oxides. On the basis of a potentially Ω-shaped salen-type ligand providing an N 2 O 2 as well as an O 2 O 2 coordination site, mixed metal coordination compounds with Cu(II) or Ni(II) and alkali metal ions have been studied for their structural and optical properties. UV− vis and 1 H NMR titrations show that the obtained compounds adopt partially different structures in solution compared to the solid state. In the latter case, the coordination geometry is mainly governed by the size of the alkali metal ion as well as the transition metal ion used. ■ INTRODUCTIONThe precise arrangement and compartmentalization of metal ions are important both in biology as well as in materials science.1−5 Siderophores such as iron chelators produced by microbes are for example prototypes for metal specific uptaking agents. These could be used in industrial or environmental cleanup processes to selectively extract metal ions.6 Artificial systems such as salen (N,N′-disalicylidene-ethylenediamine) and its derivatives are commonly employed as versatile chelate ligands in coordination chemistry and obtained by a straightforward condensation reaction. 7 Containing two Schiff base 8 coordinating moieties, this family of ligands is able to bind to transition-metal ions in a tetradentate fashion forming stable complexes through its N 2 O 2 site. Furthermore, they represent versatile ligands type thanks to their tunable design. Several structural studies were undertaken on bi-or trinuclear mono-or heterometallic Schiff base complexes. 33−37Interesting trinuclear structures of Zn-salen based complexes were reported in Cai's work, by tuning the counterions, the solvent, or the reaction conditions. 68 A structural description of a binuclear Zn complex able to undergo transmetalation as well as polynuclear salen compounds was presented by Kleij and coworkers. 69,70 On the basis of salen-type ligands, Nabeshima et al. have described multiple-metal containing host−guest complexes using transmetalation reactions to incorporate the guest ions. 22,71 These ligands can adopt, depending on the ionic radius of the metal ions, a helical conformation in solution. 72,73 They also reported the first efficient and selective introduction of three different metal ions into one ligand under thermodynamic control. 4 While numerous transition metal ions were widely employed along with the salen-derived ligands for multiple purposes, the series with alkali metal ions remain however not entirely investigated. 21,74,75 Previous tests to use alkali ions as guests in larger H 2 L salen-type ligands using also transmetalation were unsuccessful.72 While a recent publication by the Nabeshima group deals with the formation of alkali metal ion complexes with macrocyclic ligands in solution, no 1

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Section: ■ Results and Discussionmentioning

confidence: 84%

Threading Salen-type Cu- and Ni-Complexes into One-Dimensional Coordination Polymers: Solution versus Solid State and the Size Effect of the Alkali Metal Ion

Finelli

Hérault

Crochet

et al. 2018

Crystal Growth & Design

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“…1 H NMR spectral studies 1 HNMR spectra of ATS and Zn(II) complex were recorded in DMSO-d 6 solvent and the data along with the assignments are included in Table 4. The 1 HNMR spectra of ATS Schiff base shows one singlet at 13.17 ppm corresponding to phenolic-OH proton and one singlet at 8.67 ppm corresponding to azomethine proton (-CH N-) [57,58]. Also, the 1 HNMR spectra of ATS-Schiff base ligand revealed a multiplet at 7.47-7.72 ppm corresponding to aromatic protons [59].…”

Section: Electron Spin Resonancementioning

confidence: 92%

Synthesis, spectral characterization, solution equilibria, in vitro antibacterial and cytotoxic activities of Cu(II), Ni(II), Mn(II), Co(II) and Zn(II) complexes with Schiff base derived from 5-bromosalicylaldehyde and 2-aminomethylthiophene

El‐Sherif

Eldebss

2011

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

142

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“…* and n ! * transitions of C¼N chromophore or charge-transfer transition arising from electron interactions between the metal and ligand, which involves either a metal-to-ligand or ligand-to-metal electron transfer [15,16]. The n-* bands in the complexes show a slight shift due to donation of electrons to the metal and hence, coordination of azomethine, with a reduction of intensity.…”

Section: Electronic and Magnetic Moment Studiesmentioning

confidence: 97%

Studies on DNA binding, electrochemical activation, DNA photocleavage, and biopotency of N and O donor bidentate ligands with Cu(II), Co(II), and Zn(II)

Raman

Selvan

2011

Journal of Coordination Chemistry

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Three Schiff-base ligands, namely 2-(3,4-dimethoxybenzylideneamino)phenol (HL 1 ), 2-(3-hydroxy-4-nitrobenzylidene-amino)phenol (HL 2 ), and 2-(3-methoxy-4-hydroxybenzylideneamino)phenol (HL 3 ) and their Cu(II), Co(II), and Zn(II) complexes were synthesized and characterized by spectroanalytical techniques. The UV-Vis and magnetic moment data revealed square-planar Cu(II) and tetrahedral Co(II) and Zn(II). Conductivity data showed the non-electrolytic nature of the complexes. Absorption and viscometric titration as well as cyclic voltammetry studies revealed the complexes as avid binders of calf thymus (CT) DNA through intercalation. A profound effect of substituents on the Schiff base was observed on binding of complexes to CT-DNA and in cleavage of supercoiled pBR322 DNA. All the complexes showed DNA cleavage in the presence of mercaptopropionic acid (MPA) except HL 1 complexes. The cleavage activity increased with longer exposure time of irradiation at 365 nm and higher complex concentration. The cleavage reactions in the presence of MPA involve hydroxyl radical. The synthesized Schiff bases and their metal complexes were also tested for antibacterial and antifungal activities. The metal complexes exhibited higher antibacterial and antifungal activities than the parent ligands and their biopotency is discussed.

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Synthesis, crystal structures and spectral characterization of trans-bisaquabis(o-vanillinato)copper(II), cis-aquabis(o-vanillinato)copper(II) and aqua[bis(o-vanillinato)-1,2-ethylenediimin]copper(II)

Cited by 47 publications

References 24 publications

Threading Salen-type Cu- and Ni-Complexes into One-Dimensional Coordination Polymers: Solution versus Solid State and the Size Effect of the Alkali Metal Ion

Threading Salen-type Cu- and Ni-Complexes into One-Dimensional Coordination Polymers: Solution versus Solid State and the Size Effect of the Alkali Metal Ion

Synthesis, spectral characterization, solution equilibria, in vitro antibacterial and cytotoxic activities of Cu(II), Ni(II), Mn(II), Co(II) and Zn(II) complexes with Schiff base derived from 5-bromosalicylaldehyde and 2-aminomethylthiophene

Studies on DNA binding, electrochemical activation, DNA photocleavage, and biopotency of N and O donor bidentate ligands with Cu(II), Co(II), and Zn(II)

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