End-on cyanate or end-to-end thiocyanate bridged dinuclear copper(<scp>ii</scp>) complexes with a tridentate Schiff base blocking ligand: synthesis, structure and magnetic studies

Khan, Samim; Sproules, Stephen; Natrajan, Louise S.; Harms, Klaus; Chattopadhyay, Shouvik

doi:10.1039/c7nj03990e

Cited by 20 publications

(8 citation statements)

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“…The tetradentate N 2 O 2 donor Schiff base ligand (H 2 L) has been produced by the condensation of ethylendiamine and 4-(diethylamino)-2-hydroxybenzaldehyde following the literature method. 34…”

Section: Synthesismentioning

confidence: 99%

Diethylaminophenyl-based Schiff base Cu(ii) and V(iv) complexes: experimental and theoretical studies and cytotoxicity assays

et al. 2019

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Section: Synthesismentioning

confidence: 99%

Diethylaminophenyl-based Schiff base Cu(ii) and V(iv) complexes: experimental and theoretical studies and cytotoxicity assays

et al. 2019

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“…Dinuclear copper complexes are also models of active copper containing enzymes, e.g., hemocyanin or cytochrome c [ 9 , 10 ], and they are meaningful as precursors in the chemistry of supramolecular and discrete molecular high-nuclearity Cu(II) complexes [ 11 , 12 , 13 , 14 ]. The variety of organic ligands is essential in coordination chemistry as they influence the magnetic, spectroscopic properties, and geometry of complexes [ 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 ]. Different species were used as bridging ligands in copper complexes, i.e., cyanate, thiocyanate [ 4 , 23 ], phenoxo [ 24 ], chloride [ 11 ].…”

Section: Introductionmentioning

confidence: 99%

“…The variety of organic ligands is essential in coordination chemistry as they influence the magnetic, spectroscopic properties, and geometry of complexes [12][13][14][15][16][17][18][19][20][21][22][23][24][25]. Different species were used as bridging ligands in copper complexes, i.e., cyanate, thiocyanate [4,23], phenoxo [24], chloride [11]. The studies of a series of phenoxo-and hydroxo-bridged dicopper(II) complexes obtained from bis(2-methylpyridyl)aminomethyl as complexing arms with different substituting groups, e.g., CH 3 or OCH 3, demonstrated that a slight modification of the ligand topology may significantly affect the spectroscopic and redox properties of the complexes and may lead to developing of transient, mixed-valent Cu(II)-Cu(III) complexes [12].…”

Section: Introductionmentioning

confidence: 99%

Dinuclear Copper(II) Complexes with Schiff Bases Derived from 2-Hydroxy-5-Methylisophthalaldehyde and Histamine or 2-(2-Aminoethyl)pyridine and Their Application as Magnetic and Fluorescent Materials in Thin Film Deposition

Barwiołek

Kaczmarek‐Kędziera

Muzioł

et al. 2020

IJMS

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Two Cu(II) complexes, 1 and 2, with tridentate Schiff bases derived from 2-hydroxy-5-methylisophthalaldehyde and histamine HL1 or 2-(2-aminoethyl)pyridine HL2, respectively, were obtained and characterized by X-ray crystallography, spectroscopic (UV-vis, fluorescence, IR, and EPR), magnetic, and thermal methods. Despite the fact that the chelate formed by the NNO ligand donors (C26-C25H2-C24H2-N23=C23H-C22-C19Ph(O1)-C2(Ph)-C3H=N3-C4H2-C5H2-C6 fragment) are identical, as well as the synthesis of Cu(II) complexes (Cu:L = 2:1 molar ratio) was performed in the same manner, the structures of the complexes differ significantly. The complex 1, {[Cu2(L1)Cl2]2[CuCl4]}·2MeCN·2H2O, consists of [Cu2(L1)Cl2]+ units in which Cu(II) ions are bridged by the HL1 ligand oxygen and each of these Cu(II) ions is connected with Cu(II) ions of the next dimeric unit via two bridging Cl− ions to form a chain structure. In the dinuclear [Cu2(L2)Cl3]⋅0.5MeCN complex 2, each Cu(II) is asymmetrically bridged by the ligand oxygen and chloride anions, whereas the remaining chloride anions are apically bound to Cu(II) cations. In contrast to the complex 1, the square-pyramidal geometry of the both Cu(II) centers is strongly distorted. The magnetic study revealed that antiferromagnetic interactions in the complex 2 are much stronger than in the complex 1, which was corresponded with magneto-structural examination. Thin layers of the studied Cu(II) complexes were deposited on Si(111) by the spin coating method and studied by scanning electron microscopy (SEM/EDS), atomic force microscopy (AFM), and fluorescence spectroscopy. The Cu(II) complexes and their thin layers exhibited fluorescence between 489–509 nm and 460–464 nm for the compounds and the layers, respectively. Additionally, DFT calculations were performed to explain the structures and electronic spectral properties of the ligands.

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“…The UV absorption bands around 290 nm may be assigned to intra ligand n‐π * transitions of azomethine (C=N) function of Schiff base . The band around 390 nm may be attributed to LMCT transition from the N donor centres of Schiff base to copper(II) ,…”

Section: Description Of Structuresmentioning

confidence: 99%

Chirality‐Induced Variation in Interaction of Two Similar Copper(II) Coordination Polymers with Calf Thymus DNA: Exploration of Their Antimicrobial Activity and Cytotoxicity

et al. 2018

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Two polynuclear end‐to‐end dicyanamide (dca) bridged copper(II) Schiff base complexes [Cu(L1)(μ1,5‐dca)]n (1) and [Cu(L2)(μ1,5‐dca)]n (2) {[HL1=(1‐(2‐(diethylamino)ethylimino)ethyl) naphthalene‐2‐ol] and [HL2=(1‐(2‐(dimethylamino)ethylimino)methyl) naphthalene‐2‐ol]} were synthesized and X‐ray characterized. Complex 1 crystallizes in chiral space group C2 and complex 2 crystallizes in achiral space group P21/c. Interactions of both complexes with calf thymus DNA (CT DNA) were studied by UV‐vis and circular dichroism spectroscopy. Molecular docking studies were also carried out for both complexes to find their binding affinity using Alpha PMI as the placement methodology. Although docking studies indicated that the binding constants of both complexes with CT DNA were more or less same, UV‐Vis spectral data indicated that the binding constant of complex 1 with CT DNA is considerably large compared to that of complex 2. As complex 1 is chiral and complex 2 is achiral, it may be concluded that the chirality of complex 1 played very significant role to binding of chiral DNA molecule. The antimicrobial activity were estimated by the determination of the minimal inhibitory concentration (MIC) using the broth microdilution method. The complexes showed high in vitro cytotoxicity against MDA‐MB 468 cells.

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End-on cyanate or end-to-end thiocyanate bridged dinuclear copper(ii) complexes with a tridentate Schiff base blocking ligand: synthesis, structure and magnetic studies

Abstract: Two new dinuclear Schiff base copper(ii) complexes have been synthesized and characterized. Copper(ii) centres are ferromagnetically coupled in 1 and antiferromagnetically coupled in 2.

Cited by 20 publications

References 50 publications

Diethylaminophenyl-based Schiff base Cu(ii) and V(iv) complexes: experimental and theoretical studies and cytotoxicity assays

Diethylaminophenyl-based Schiff base Cu(ii) and V(iv) complexes: experimental and theoretical studies and cytotoxicity assays

Dinuclear Copper(II) Complexes with Schiff Bases Derived from 2-Hydroxy-5-Methylisophthalaldehyde and Histamine or 2-(2-Aminoethyl)pyridine and Their Application as Magnetic and Fluorescent Materials in Thin Film Deposition

Chirality‐Induced Variation in Interaction of Two Similar Copper(II) Coordination Polymers with Calf Thymus DNA: Exploration of Their Antimicrobial Activity and Cytotoxicity

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