New Cu(II) complexes with polydentate chelating Schiff base ligands: Synthesis, structures, characterisations and biochemical activity studies

Samanta, Brajagopal; Chakraborty, Joy; Choudhury, Chirantan Roy; Dey, Sudipto; Dey, Dipankar; Batten, Stuart Robert; Jensen, Paul R.; Yap, G. P. A.; Mitra, Samiran

doi:10.1007/s11224-006-9115-0

Cited by 77 publications

(31 citation statements)

References 52 publications

(43 reference statements)

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“…On the other hand, in the complexes spectra, some weak absorption peaks appeared at 507-512 cm -1 that may be related to the stretching vibration of Hg-N bonds [32]. In addition, observation of very strong peak at wavenumber of 2113 cm -1 is powerful evidence confirming the attachment of thiocyanate ion to the central mercury ion through Scoordination [33,34].…”

Section: Resultsmentioning

confidence: 80%

Synthesis, spectral, thermal behaviors, and antimicrobial studies of some nanostructure five coordinated Hg(II) complexes

Jahromi

Montazerozohori

2015

J Therm Anal Calorim

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A series of novel five coordinated mercury(II) complexes of a new recently synthesized tridentate ligand are presented. The mercury(II) complexes were characterized by various spectral and physical techniques such as FTIR, UV-visible, 1 H and 13 C NMR spectra, thermal analyses, and decomposition temperature and conductivity measurement. Also nanostructure size of titled mercury coordination compounds have been prepared by the reaction of ligand and mercury salts under ultrasonic conditions. The nanostructure size of the complexes was confirmed by XRD patterns, scanning electron microscopy, and transmission electron microscopy. According to the mentioned analyses, the molecular formula of HgLX 2 (X = halide and/or pseudo-halide anions and L = ligand) was suggested for the complexes. Thereafter all mercury(II) complexes were tested for their in vitro antibacterial activities against two Gram-positive (Staphylococcus aureus and Bacillus subtilis) and two Gram-negative (Escherichia coli and Pseudomonas aeruginosa) bacterial strains. Also in vitro antifungal activities of them against Candida albicans and Aspergillus niger were investigated. The results indicated that all compounds can act as antibacterial and antifungal agents. Moreover, thermal behaviors of the complexes were studied in the range of 20-900°C. Thermogravimetric study indicated that the mercury complexes are thermally degraded via 3-9 thermal steps.

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Section: Resultsmentioning

confidence: 80%

Synthesis, spectral, thermal behaviors, and antimicrobial studies of some nanostructure five coordinated Hg(II) complexes

Jahromi

Montazerozohori

2015

J Therm Anal Calorim

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“…Schiff-bases have played an important role in the development of coordination chemistry as they readily form stable complexes with most of the transition metals, in which some could exhibit interesting properties [1][2][3][4].…”

Section: Discussionmentioning

confidence: 99%

Crystal structure of (5-bromo-2,3-diaminopyridine-N,N′-bis(3-methoxysalicylideneiminato)- O,O′,N,N′)nickel(II) – methanol (1:1), Ni(C21H16BrN3O4) · CH3OH

Lian-wen¹

2009

Zeitschrift Für Kristallographie - New Crystal Structures

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Source of materialThe Schiff base ligand was synthesized by condensation 5-bromo-2,3-diaminopyridine and 2-hydroxy-3-methoxybenzaldehyde with the ratio 1:2inethanol. The synthesis of the title complex was carried out by reacting Ni(ClO 4 ) 2 · 6H 2 Oand the schiff base ligand (1:1, molar ratio) in methanol. After stirring, the process was continued for about 30 min at room temperature. The mixture was filtered and the filtrate was allowed to partially evaporate in air for sevral days to produce red-brown crystals suitable for X-ray diffraction with ayield about 60 %. DiscussionSchiff-bases have played an important role in the development of coordination chemistry as they readily form stable complexes with most of the transition metals, in which some could exhibit interesting properties [1][2][3][4].The coordination sphere for the Ni(II) ion in the title crystal structure is aslightly distorted square planar, in which the four positions are occupied by two Natoms and two Oatoms of the Schiffbase ligand. The mean deviation from the plane formed by the two Natoms, two Oatoms and the Ni ion is only 0.035 Å,indicative of that these five atoms can form aperfect plane. The bond lengths of Ni-Na re 1.874(3) Å and 1.929(3) Å,a nd Ni-O 1.861(2) Å and 1.905(2) Å,respectively, are consistant with the corresponding distances in 6,6'-dimethoxy-2,2'-(ethane-1,2-diyl-bis(nitrilomethylidyne)diphenolato)nickel(II) [5].

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“…The electronic spectra of the ligand show strong absorption band at 264nm but in complexes this band is slightly shifted to lower frequency 17 which are * charge transfer transitions. The band at 425nm can be assigned to the n* transitions of the azomethine group.…”

Section: Electronic Spectra and Magnetic Momentmentioning

confidence: 99%

Synthesis, spectral and biological studies of new Mn(II) and Fe(II) complexes of 2,3-Butanedione 3-monoxime

Rajurkar¹,

Kamble²

2015

Orient. J. Chem

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New Cu(II) complexes with polydentate chelating Schiff base ligands: Synthesis, structures, characterisations and biochemical activity studies

Abstract: We have reported herein the synthesis of three new Cu(II) complexes of tri-and tetradentate Schiff

Cited by 77 publications

References 52 publications

Synthesis, spectral, thermal behaviors, and antimicrobial studies of some nanostructure five coordinated Hg(II) complexes

Synthesis, spectral, thermal behaviors, and antimicrobial studies of some nanostructure five coordinated Hg(II) complexes

Crystal structure of (5-bromo-2,3-diaminopyridine-N,N′-bis(3-methoxysalicylideneiminato)- O,O′,N,N′)nickel(II) – methanol (1:1), Ni(C21H16BrN3O4) · CH3OH

Synthesis, spectral and biological studies of new Mn(II) and Fe(II) complexes of 2,3-Butanedione 3-monoxime

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