scholarly journals Preparation and Electronic Property Investigation of Zinc(II)-Schiff Base Complexes in the Confined Space

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Peng Shang ◽  
Lei Zhang
Keyword(s):  
Schiff Base ◽  
Molecular Orbital ◽  
Schiff Base Complex ◽  
Initial Study ◽  
Density Variation ◽  
Schiff Base Complexes ◽  
Confined Space ◽  
Electron Density Variation ◽  
Calculation Results ◽  
Space Effect

Metal-Schiff base complexes have attracted continued research interest regarding their intriguing and useful features, while the electronic properties of these complexes in the confined space have not been sufficiently addressed in previous studies. In this work, a new zinc(II)-Schiff base complex bis(N-dodecyl salicylideneiminato)Zn(II) (1) was synthesized and subsequently loaded in an inorganic solid host. A large red shift (~40 nm) of the absorption onset was recorded, when the microenvironment of1changed from the solvent ethanol to the inorganic solid medium, evidencing the confined space effect. The marked shift of the absorption onset was associated with a band-gap reduction between the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO). Theoretical calculation results showed that the confined space effect is distance dependent and exerts a more profound influence on the HOMO than the LUMO within an effective distance range. An initial study implied that the confined space effect is also accompanied with the electron density variation.

Synthesis, Characterization, and Antimicrobial Activities of New Organic-Inorganic Hybird Compound Based on Polyoxovanadate and Metal-Schiff-Base Complex

2015 ◽  
Vol 1105 ◽  
pp. 215-219
Author(s):  
Qiong Wu ◽  
Xiao Lin Ji ◽  
Lu Jing ◽  
Hong Ping Ju ◽  
Hai Wang
Keyword(s):  
Schiff Base ◽  
Human Cancer ◽  
Synergetic Effect ◽  
Schiff Base Complex ◽  
Antimicrobial Activities ◽  
Schiff Base Complexes ◽  
X Ray Diffraction ◽  
Base Complex ◽  
X Ray ◽  
Vis Spectroscopy

The reaction of polyoxovanadate and metal-Schiff base complex resulted in the formation of a new organic-inorganic hybrid compounds with the formula Na2[Mn (Salen)(H2O)2]4[V10O28]·9H2O (1) (salen=N,N’-ethylene-bis (salicylideneiminate). Compound 1 have been structurally characterized by IR, UV-vis spectroscopy and single crystal X-ray diffraction. Crystal data for 1: Triclinic, P-1, a=14.1123(3)Å, b=13.9397(7) Å, c=14.2564(5)Å, α=65.4160(9)°, β=81.3920(6)°, γ=89.5740(7) °. Structural analyses revealed that compound 1 represent a rare example of isopolyoxovanadate based metal-Schiff-base complexes, moreover, this is the first POM based metal Schiff-base complex isolated in aqueous solution medium, which may also propose a green chemical way to the synthesis of POM based hybrid. Compare with isopolyoxovanadate precusor Na6 [V10O28], compound 1 exhibit higher antimicrobial activities against human cancer cell, the phenomenon can be explained by the synergetic effect between POM and Schiff-base complex.

Traceable in-cell synthesis and cytoplasm-to-nucleus translocation of a zinc Schiff base complex as a simple and economical anticancer strategy

2019 ◽  
Vol 55 (54) ◽  
pp. 7852-7855 ◽  
Author(s):  
Qian Cao ◽  
Jing Yang ◽  
Hang Zhang ◽  
Liang Hao ◽  
Gang-Gang Yang ◽  
...  
Keyword(s):  
Schiff Base ◽  
Schiff Base Complex ◽  
Schiff Base Complexes ◽  
Specific Therapy ◽  
Base Complex ◽  
Cell Synthesis

A facile and cheap strategy based on visualized in-cell synthesis of theranostic Zn Schiff base complexes realizes cancer-specific therapy.

A new class of quadruplex DNA-binding nickel Schiff base complexes

2020 ◽  
Vol 49 (15) ◽  
pp. 4843-4860 ◽  
Author(s):  
Son Q. T. Pham ◽  
Nawal Assadawi ◽  
Jadon Wells ◽  
Reece A. Sophocleous ◽  
Kimberley J. Davis ◽  
...  
Keyword(s):  
Schiff Base ◽  
Dna Binding ◽  
Cancer Cells ◽  
Schiff Base Complex ◽  
Schiff Base Complexes ◽  
Selective Binding ◽  
Quadruplex Dna ◽  
Base Complex ◽  
New Class ◽  
Binding Behaviour

A new nickel Schiff base complex shows selective binding behaviour towards quadruplex DNA and cytotoxicity against cancer cells.

Spectroscopic and Magnetic Properties of Gadolinium Macroacyclic and Macrobicyclic Complexes

2007 ◽  
Vol 128 ◽  
pp. 199-205
Author(s):  
G. Leniec ◽  
Slawomir M. Kaczmarek ◽  
J. Typek ◽  
Beata Kołodziej ◽  
Eugeniusz Grech ◽  
...  
Keyword(s):  
Schiff Base ◽  
Metal Ion ◽  
Molecular Spectroscopy ◽  
Schiff Base Complex ◽  
Schiff Base Complexes ◽  
Magnetic Interactions ◽  
Paramagnetic Resonance ◽  
Complex Samples ◽  
Integrated Intensity ◽  
Electron Paramagnetic

As a result of the Schiff base condensation the gadolinium macroacyclic and macrobicyclic Schiff base complexes have been synthesized and investigated by infrared spectroscopy (IR) and electron paramagnetic resonance (EPR). Both electron ionization and electron spray Molecular Spectroscopy spectra confirmed the [1:1] proportion of a ligand to metal in gadolinium macrocyclic and mocrobicyclic Schiff base complex samples. The thermogravimetrydifferential thermal analysis (TG-DTA) indicated the presence of two water molecules in the innersphere of the macrobicyclic complex and confirmed no water coordination of the metal ion in the macroacyclic complex. The temperature dependence of the integrated intensity of the EPR spectra enabled the magnetic interactions in the spin system of these compounds to be revealed.

scholarly journals Schiff base complex conjugates of bovine serum albumin as artificial metalloenzymes for eco-friendly enantioselective sulfoxidation

RSC Advances ◽  
2018 ◽  
Vol 8 (71) ◽  
pp. 40720-40730 ◽  
Author(s):  
Jie Tang ◽  
Pengfei Yao ◽  
Lina Wang ◽  
Hedong Bian ◽  
Meiyi Luo ◽  
...  
Keyword(s):  
Schiff Base ◽  
Bovine Serum Albumin ◽  
Serum Albumin ◽  
Bovine Serum ◽  
Schiff Base Complex ◽  
Docking Studies ◽  
Host Protein ◽  
Schiff Base Complexes ◽  
Uv Visible ◽  
Artificial Metalloenzymes

Artificial metalloenzymes have been prepared by non-covalent insertion of transition metal Schiff-base complexes into bovine serum albumin as the host protein and were characterized by UV-visible spectroscopy, ESI-TOF mass spectrometry and molecular docking studies.

scholarly journals Development of Carbon Paste Electrode Chemically Modified with Schiff Base Complexes for Forensic Analysis of Cocaine

2021 ◽  
Author(s):  
Ana Beatriz da Silva ◽  
Alex Castro ◽  
Marcelo de Oliveira
Keyword(s):  
Schiff Base ◽  
Carbon Paste Electrode ◽  
Schiff Base Complex ◽  
Forensic Analysis ◽  
Schiff Base Complexes ◽  
Carbon Paste ◽  
Chemically Modified ◽  
Cocaine Hydrochloride ◽  
Electrode Passivation ◽  
Paste Electrode

In this article we have studied the electrochemical behavior of cocaine hydrochloride on the surface of a carbon paste electrode chemically modified with a Schiff base complex, namely [FeIII(salen)], [ZrOII(salen)], or [NiII(salen)], during voltametric analyses. Among the tested complexes, [NiII(salen)] provided amperometric and thermal stability and it was only degraded at temperatures above 400 ºC. To prepare the cocaine hydrochloride was used hydrochloric acid (HCl 1 mol L-1) after we tested the electrode, the HCl did not cause electrode passivation. In this study we can see that the voltammetric analyses revealed a satisfactory result, that the peak current obtained between 0.1 and 0.2 V (vs. Ag/AgCl) varied linearly with cocaine hydrochloride concentration and the average amperometric sensitivity, the LOD, and the LOQ were 5.5 μmol L-1, 0.945 μmol L-1, and 3.16 μmol L-1, respectively.

Two new POM-based compounds modified by lanthanide–Schiff base complexes with interesting NLO properties

2018 ◽  
Vol 74 (11) ◽  
pp. 1370-1377 ◽  
Author(s):  
Xi-Ming Luo ◽  
Chen-Hui Cui ◽  
Jia-Peng Cao ◽  
Qing-Fang Lin ◽  
Yan Xu
Keyword(s):  
Schiff Base ◽  
Nonlinear Optics ◽  
Three Dimensional ◽  
Schiff Base Complex ◽  
Schiff Base Complexes ◽  
Photon Absorption ◽  
X Ray Diffraction ◽  
Hydrothermal Conditions ◽  
X Ray ◽  
Two Photon

Two POM-based lanthanide derivatives, namely {triaqua[2,6-diacetylpyridine bis(semicarbazone)-κ5 O,N,N′,N′′,O′]terbium(III)}-μ-oxido-[tricosa-μ2-oxido-dodecaoxido-μ12-phosphato-dodecamolybdenum(VI)] pentahydrate (1), [Tb(C11H15N7O2)(H2O)3][PMo12O40]·5H2O, and the dysprosium(III) analogue (2), have been isolated successfully by the reaction of Keggin–POM [PMo12O40]3− (abbreviated as PMo12 ), the Ln3+ ion and the Schiff base 2,6-diacetylpyridine bis(semicarbazone) (DAPSC) ligand under hydrothermal conditions. [Ln(DAPSC)(H2O)3][PMo12O40]·5H2O is a PMo12 -supported cluster featuring a lanthanide–Schiff base complex [denoted Ln– L (Schiff base)]. Single-crystal X-ray diffraction analysis reveals that the LnIII ion is in a distorted tricapped trigonal prismatic arrangement, coordinated by six O atoms and three N atoms. Two O atoms and three N atoms are provided by one DAPSC ligand, while the additional O atoms originate from a PMo12 cluster and three water molecules. Hydrogen-bonding interactions between adjacent clusters form an interesting three-dimensional supramolecular structure. The identities of 1 and 2 were characterized by IR spectroscopy, thermogravimetric analysis and powder X-ray diffraction. Interestingly, both compounds possess excellent two-photon absorption (TPA) responses to the third-order nonlinear optics (NLO) (2264 GM for 1 and 941 GM for 2), suggesting that they have potential applications in the field of nonlinear optics (NLO). To our knowledge, 1 and 2 are the first POM-based Ln– L (Schiff base) complexes showing excellent two-photon responses. Meanwhile, the electrochemical properties of both compounds were studied in detail.

Synthesis, characterization, and thermodynamics of tertiary phosphine cobalt(III) Schiff-base complexes

2001 ◽  
Vol 79 (9) ◽  
pp. 1360-1365 ◽  
Author(s):  
Mozaffar Asadi ◽  
Ali Hossein Sarvestani
Keyword(s):  
Schiff Base ◽  
Ionic Strength ◽  
Thermodynamic Parameters ◽  
Stability Constants ◽  
Schiff Base Complex ◽  
Axial Ligand ◽  
Adduct Formation ◽  
Schiff Base Complexes ◽  
Tertiary Phosphine ◽  
The Stability

[Co(5-nitroSalen)(PBu3)]ClO4·H2O and [Co(Salpd)(PBu3)]ClO4·H2O were synthesized and characterized. The stability constants and the thermodynamic parameters were measured spectrophotometrically for 1:1 adduct formation of [CoL(PBu3)]ClO4·H2O, (L = Salen, 5-nitroSalen, Salpd), and [Co(Salen)(PMe2Ph)]ClO4·H2O as acceptors with P(OR)3, (R = Me, Et, i-Pr) as donors, in acetonitrile solvent and in constant ionic strength (I = 0.01 M) and at various temperatures. The trend of the reactivity of cobalt(III) Schiff-base complexes with PBu3 axial ligand toward a given donor is as follows: 5-nitroSalen > Salen > Salpd.Also, the following reactivity trend of the donors toward a given cobalt(III) Schiff-base complex is in the operation: P(O-i-Pr)3 > P(OEt)3 > P(OMe)3.Key words: cobalt(III) Schiff-base complexes, thermodynamic parameters, trialkylphosphite, adduct complexes, stability constants.

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