Novel unsymmetrical macrocyclic dicompartmental binuclear copper(II) complexes bearing 4- and 6-coordination sites: Electrochemical, magnetic, catalytic and antimicrobial studies

Sreedaran, S.; Bharathi, K. Shanmuga; Rahiman, A. Kalilur; Jagadish, L.; Kaviyarasan, V.; Narayanan, V.

doi:10.1016/j.poly.2008.06.025

Cited by 56 publications

(29 citation statements)

References 67 publications

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“…The I 2 doped Co(dtc-SB) displays fluorescence emission with stokes shift of 146 nm whereas the Na doped sample exhibits 86 nm stokes shift. High fluorescent behaviour in Co(dtc-SB) NWs is attributed to the complex formation leading to reduction of PET process (Sreedaran et al, 2008). Four membered chelate ring present in Co(dtc-SB) increases rigidity in comparison to free ligand, which in turn, reduces the loss of energy by vibrational decay and enhances the fluorescence intensity (Pandey et al, 2011).…”

Section: Optical Properties Of Co(dtc-sb) Nwsmentioning

confidence: 99%

Synthesis, Electronic and Optical Properties of Cobalt(II) Dithiocarbamate Fluorescent Nanowires for Optoelectronic Devices

Ujjain¹,

Ahuja²,

Sharma³

et al. 2015

IJC

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Schiff base containing symmetric bis-dithiocarbamate ligand Na 2 [dtc-SB-dtc] (SB = Bi-Schiff base Phenylene diamine) is synthesized and metallated with Co(II)Cl 2 .6H 2 O to form [Co(dtc-SB-dtc).2H 2 O] n Co(dtc-SB) infinite coordination polymer (ICP) nanowires [Co(dtc-SB) NWs]. Pair of Satellites in X-ray photoelectron spectroscopy (XPS) spectrum of Co 2p confirm the formation of hexa-coordinated Co(II). Presence of hyperfine pattern in low temperature EPR spectrum is due to the splitting of octahedral ground state 4 T 1 for Co(II). Introduction of a rigid, non-planar, four membered dtc Cobalt chelating ring in coordination polymer assisted in reduction of photoinduced electron transfer (PET) process to yield high fluorescence. Prepared Co(dtc-SB) NWs are highly resistive however after suitable doping, exhibit p and n type conductivity. Temperature dependent conductivity results of different doping concentrations in NWs reflect activated type conduction with two different activation energies. UV-Visible absorption spectra show decrement in optical gap whereas emission spectra demonstrate quenching after p and n doping. Efficient quenching of emission indicates energy transfer between dopant ions and NWs.

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Section: Optical Properties Of Co(dtc-sb) Nwsmentioning

confidence: 99%

Synthesis, Electronic and Optical Properties of Cobalt(II) Dithiocarbamate Fluorescent Nanowires for Optoelectronic Devices

Ujjain¹,

Ahuja²,

Sharma³

et al. 2015

IJC

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“…The absence of a peak around 3,400 cm -1 in all the complexes indicate the absence of phenolic m(OH) due to deprotonation followed by complexation [25]. The FTIR spectra of H 2 L 1 -H 2 L 4 show a sharp band in the region 1,610-1,643 cm -1 due to the m(C=N) group [26,27]. The FTIR spectra of the copper(II) complexes of all the ligands show bands in the region 3,285-3,335 cm -1 , assigned to m(NH) groups.…”

Section: Resultsmentioning

confidence: 92%

“…Apart from this an additional peak in the range of 624-630 cm -1 is assigned to a perchlorate bending vibration. Further, bands in the region of 1,530-1,558 cm -1 in all the complexes suggest phenoxide bridging with the metal atoms [26,27]. Electronic spectra of the complexes were obtained in DMF.…”

Section: Resultsmentioning

confidence: 95%

N-functionalized cyclam based trinuclear copper(II) complexes: electrochemical, magnetic, catalytic and antimicrobial studies

Sreedaran

Bharathi

Rahiman

et al. 2008

Transition Met Chem

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A series of trinuclear Cu(II) complexes have been prepared by Schiff base condensation of 1,8-[bis-(3-formyl-2-hydroxy-5-methyl)benzyl]-l,4,8,11-tetraazacyclotetradecane and 1,8-[bis(3-formyl-2-hydroxy-5-bromo)-benzyl]-l,4,8,11-tetraazacyclotetradecane with aromatic and aliphatic diamines, Cu(II) perchlorate and triethylamine. The complexes were characterized by elemental and spectroscopic analysis. Electrochemical studies of the complexes in DMF solution show three irreversible one-electron reduction processes around E pc 1 = -0.73 to -0.98 V, E pc 2 = -0.91 to -1.20 V and E pc 3 = -1.21 to -1.33 V. ESR spectra and magnetic moments of the trinuclear Cu(II) complexes show the presence of antiferromagnetic coupling. The rate constants for hydrolysis of 4-nitrophenylphosphate by the Cu(II) complexes are in the range of 3.33 9 10 -2 to 7.58 9 10 -2 min -1 . The rate constants for the catecholase activity of the complexes fall in the range of 2.67 9 10 -2 to 7.56 9 10 -2 min -1 . All the complexes were screened for antifungal and antibacterial activity.

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“…increasing in the chain length enhances the rate constant of hydrolysis fairly well by producing distortion in the geometry around the metal ion that enhances the accessibility of the metal ion for the bonding of phosphate and OH groups. [26][27][28] The rate constant value for the mononuclear gadolinium complexes was found to be increasing in the following order:…”

Section: Fluorescent Properties Of Complexesmentioning

confidence: 99%

Spectral, Electrochemical, Fluorescence, Kinetic and Anti-microbial Studies of Acyclic Schiff-base Gadolinium(III) Complexes

Vijayaraj¹,

Prabu²,

Suresh³

et al. 2012

Bulletin of the Korean Chemical Society

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A new series of acyclic mononuclear gadolinium(III) complexes have been prepared by Schiff-base condensation derived from 5-methylsalicylaldehyde, diethylenetriamine, tris(2-aminoethyl) amine, triethylenetetramine, N,N-bis(3-aminopropyl)ethylene diamine, N,N-bis(aminopropyl) piperazine, and gadolinium nitrate. All the complexes were characterized by elemental and spectral analyses. Electronic spectra of the complexes show azomethine (CH=N) within the range of 410-420 nm. The fluorescence efficiency of Gd(III) ion in the cavity was completely quenched by the higher chain length ligands. Electrochemical studies of the complexes show irreversible one electron reduction process around −2.15 to −1.60 V The reduction potential of gadolinium(III) complexes shifts towards anodic directions respectively upon increasing the chain length. The catalytic activity of the gadolinium(III) complexes on the hydrolysis of 4-nitrophenylphosphate was determined. All gadolinium(III) complexes were screened for antibacterial activity.

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Novel unsymmetrical macrocyclic dicompartmental binuclear copper(II) complexes bearing 4- and 6-coordination sites: Electrochemical, magnetic, catalytic and antimicrobial studies

Cited by 56 publications

References 67 publications

Synthesis, Electronic and Optical Properties of Cobalt(II) Dithiocarbamate Fluorescent Nanowires for Optoelectronic Devices

Synthesis, Electronic and Optical Properties of Cobalt(II) Dithiocarbamate Fluorescent Nanowires for Optoelectronic Devices

N-functionalized cyclam based trinuclear copper(II) complexes: electrochemical, magnetic, catalytic and antimicrobial studies

Spectral, Electrochemical, Fluorescence, Kinetic and Anti-microbial Studies of Acyclic Schiff-base Gadolinium(III) Complexes

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