Dinuclear Cu(ii) complexes based on two flexible Schiff-base ligands and one unusual in situ formed diphenolate 2,6-piperidin-4-one derivative

2014 ◽  
Vol 43 (37) ◽  
pp. 13831-13834 ◽  
Author(s):  
Yuan Dai ◽  
Yin-Ge Wang ◽  
Jiao Geng ◽  
Yu-Xin Peng ◽  
Wei Huang
Keyword(s):  
Schiff Base ◽  
Schiff Base Ligand ◽  
Side Product ◽  
Schiff Base Ligands

A dinuclear Cu(ii) complex 3, having an unprecedented in situ formed 2,6-piperidin-4-one-based ligand produced from a flexible Schiff-base ligand HL1, can be yielded as a side product in Cu(OAc)2·H2O–NH3·H2O dissolved in methanol–acetone besides the expected dinuclear Cu(ii) complex 1.

Screening of metal complex catalysts using bidentate Schiff base ligands for controlled cationic polymerization of vinyl ethers using in situ complexation method

2019 ◽  
Vol 10 (30) ◽  
pp. 4209-4219 ◽  
Author(s):  
Sensho Kigoshi ◽  
Arihiro Kanazawa ◽  
Shokyoku Kanaoka ◽  
Sadahito Aoshima
Keyword(s):  
Schiff Base ◽  
Metal Complex ◽  
Schiff Base Ligand ◽  
Cationic Polymerization ◽  
Vinyl Ethers ◽  
Schiff Base Ligands ◽  
Bidentate Schiff Base Ligand ◽  
Ligand Scaffolds ◽  
Metal Complex Catalysts

Appropriate ligand scaffolds in cationic polymerization were screened using various bidentate Schiff base ligand/ZrCl4 initiating systems.

scholarly journals Structural Characterization of Heterodinuclear ZnII-LnIII Complexes (Ln = Pr, Nd) with a Ring-Contracted H2valdien-Derived Schiff Base Ligand

2021 ◽  
Author(s):  
Shabana Noor ◽  
Richard Goddard ◽  
Fehmeeda Khatoon ◽  
Sarvendra Kumar ◽  
Rüdiger W. Seidel
Keyword(s):  
Molecular Structure ◽  
Schiff Base ◽  
Structural Characterization ◽  
Schiff Base Ligand ◽  
Crystal And Molecular Structure ◽  
X Ray ◽  
X Ray Crystallography ◽  
Imidazoline Ring

AbstractSynthesis and structural characterization of two heterodinuclear ZnII-LnIII complexes with the formula [ZnLn(HL)(µ-OAc)(NO3)2(H2O)x(MeOH)1-x]NO3 · n H2O · n MeOH [Ln = Pr (1), Nd (2)] and the crystal and molecular structure of [ZnNd(HL)(µ-OAc)(NO3)2(H2O)] [ZnNd(HL)(OAc)(NO3)2(H2O)](NO3)2 · n H2O · n MeOH (3) are reported. The asymmetrical compartmental ligand (E)-2-(1-(2-((2-hydroxy-3-methoxybenzylidene)amino)-ethyl)imidazolidin-2-yl)-6-methoxyphenol (H2L) is formed from N1,N3-bis(3-methoxysalicylidene)diethylenetriamine (H2valdien) through intramolecular aminal formation, resulting in a peripheral imidazoline ring. The structures of 1–3 were revealed by X-ray crystallography. The smaller ZnII ion occupies the inner N2O2 compartment of the ligand, whereas the larger and more oxophilic LnIII ions are found in the outer O2O2’ site. Graphic Abstract Synthesis and structural characterization of two heterodinuclear ZnII-LnIII complexes (Ln = Pr, Nd) bearing an asymmetrical compartmental ligand formed in situ from N1,N3-bis(3-methoxysalicylidene)diethylenetriamine (H2valdien) through intramolecular aminal formation are reported.

Synthesis of an Unprecedented H-stitched Binuclear Crystal Structure Based on Selective Fluorescence Recognition of Zn2+ in Newly Synthesized Schiff Base Ligand with DFT and Imaging Application in Living Cells

2021 ◽  
Author(s):  
SOUMYA SUNDAR MATI ◽  
Dr. SAUGATA KONAR ◽  
BOBY SAMAI
Keyword(s):  
Crystal Structure ◽  
Schiff Base ◽  
Elemental Analysis ◽  
Schiff Base Ligand ◽  
Binuclear Complex ◽  
Living Cells ◽  
X Ray Diffraction ◽  
Schiff Base Ligands ◽  
X Ray ◽  
Imaging Application

A zinc coordinated rare binuclear complex was synthesised and characterized by elemental analysis and single-crystal X-ray diffraction. Two mononuclear units formed by two Schiff base ligands 2-((2-(pyrimidin-2-yl)hydrazono)methyl)phenol (PHP) coordinated with...

Synthesis, Structure and Fluorescence Properties of a Trinuclear Zn(II) Complex with N,N,O-donor Schiff Base Ligands and Bridging Acetates

2009 ◽  
Vol 64 (4) ◽  
pp. 403-408 ◽  
Author(s):  
Shyamapada Shit ◽  
Joy Chakraborty ◽  
Brajagopal Samanta ◽  
Georgina M. Rosair ◽  
Samiran Mitra
Keyword(s):  
Schiff Base ◽  
Schiff Base Ligand ◽  
Fluorescence Properties ◽  
Schiff Base Ligands ◽  
Thermal Methods ◽  
Metal Centers ◽  
X Ray ◽  
Octahedral Environment ◽  
Distorted Octahedral ◽  
Ft Ir

A new centrosymmetric trinuclear Zn(II) complex [Zn3L2(CH3COO)4] (1) has been synthesized by the reaction of Zn(CH3COO)2 · 2H2O with a tridentate N,N,O-donor Schiff base ligand HL [C5H4NC(CH3)=NC6H4(OH)] and systematically characterized by elemental analysis, FT-IR, UV/Vis and thermal methods. Single crystal X-ray structure analysis reveals that three Zn(II) centers are in two different coordination environments. Two terminal Zn(II) centers adopt a distorted squarepyramidal geometry leaving the central Zn(II) in a distorted octahedral environment. Two adjacent metal centers are connected through single μ2-phenolato as well as double μ-acetato-O,O´ syn-syn bridges. Fluorescence properties of the complex as compared to the ligand indicate that the former can serve as a potential photoactive material.

A Quasi-Liner {MnIIDyIIIMnII} Cluster Featuring In Situ Schiff Base Ligand Transformation

2020 ◽  
Author(s):  
Fan Xu ◽  
Xue-Jing Luo ◽  
Cui-E Wu ◽  
Bei-Yi Liao ◽  
Kai Wang ◽  
...  
Keyword(s):  
Schiff Base ◽  
Schiff Base Ligand

Kinetics of Schiff base ligand transfer and rate enhancement by metal ions

1973 ◽  
Vol 26 (11) ◽  
pp. 2541 ◽  
Author(s):  
WW Fee ◽  
A Gaetano
Keyword(s):  
Schiff Base ◽  
Metal Ions ◽  
Schiff Base Ligand ◽  
Chain Reaction ◽  
Schiff Base Ligands ◽  
Rate Enhancement ◽  
Rate Acceleration ◽  
Ligand Transfer ◽  
Kinetics Of

The kinetics of the transfer of Schiff base ligands between their nickel(II) and zinc(II) complexes have been examined in dmso. Reactions completed in the presence of added nickel(II) and zinc(II) ions indicate the occurrence of a coordination chain reaction with rate acceleration prompted by one chain initiating and one chain propa- gating step.

scholarly journals Synthesis and Spectroscopic Investigations of Schiff Base Ligand and Its Bimetallic Ag(I) Complex as DNA and BSA Binders

Biomolecules ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1449
Author(s):  
Martyna Szymańska ◽  
Izabela Pospieszna-Markiewicz ◽  
Martyna Mańka ◽  
Małgorzata Insińska-Rak ◽  
Grzegorz Dutkiewicz ◽  
...  
Keyword(s):  
Schiff Base ◽  
Schiff Base Ligand ◽  
Building Blocks ◽  
Schiff Base Ligands ◽  
Design Synthesis ◽  
Coordination Sites ◽  
Cd Studies ◽  
Α Helix ◽  
Ct Dna

Generation of well-defined potential metallotherapeutics for cancer treatment, one of the most population-threatening diseases, is challenging and an active area of modern research in view of their unique properties and thus multiple possible pathways of action in cells. Specifically, Schiff base ligands were recognized as very promising building blocks for the construction of stable and active complexes of numerous geometries and topologies. Incorporation of Ag(I) ions allows for the formation of flat complexes with potential unoccupied coordination sites, thus giving rise to specific interactions between the metallotherapeutic and biomolecule of interest. Herein, we present the design, synthesis and characterization of new Schiff base ligand L and its Ag(I) bimetallic complex [Ag2L2]2+ with two planar moieties formed around the metal ions and connected through cyclohexane rings, confirmed by X-ray measurements. The compounds were described in context of their potential use as anticancer drugs through DNA and BSA binding pathways by several spectroscopic methods (CD, UV-Vis, fluorescence). We revealed that both, L and [Ag2L2]2+, interact with similar affinity with CT-DNA (Kb~106 M−1), while they differ in the type and strength of interactions with the model albumin–BSA. [Ag2L2]2+ binds BSA in both a dynamic and static manner with the Ksv = 8.8 × 104 M−1 in the Trp-134 and Trp-213 sites, whereas L interacts with BSA only dynamically (KSV = 2.4 × 104 M−1). This found further confirmation in the CD studies which revealed a reduction in α-helix content in the albumin of 16% in presence of [Ag2L2]2+.

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