R. Prabu’s research while affiliated with University of Madras and other places

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Publications (28)


Fig. 2b ESI Mass spectrum of. [GdCuL4(bpy)2(NO3)2].
Fig. 3 Electronic spectra of thebinuclear [GdCuL1-5(bpy)2(NO3) 2]complexes (a)[GdCuL1 (bpy)2(NO3)2], (b)[GdCuL2(bpy)2 (NO3)2], (c)[GdCuL3(bpy)2(NO3)2], (d)[GdCuL4(bpy)2(NO3)2] and(e) [GdCuL5(bpy)2(NO3)2].
Fig. 4 Electronic spectra of thebinuclear [GdCuL1-5(bpy)2(NO3) 2]complexes (a)[GdCuL1 (bpy)2(NO3)2], (b)[GdCuL2(bpy)2 (NO3)2], (c)[GdCuL3(bpy)2(NO3)2], (d)[GdCuL4(bpy)2(NO3)2] and(e) [GdCuL5(bpy)2(NO3)2].
Fig. 5 Emission spectra of thebinuclear [GdCuL1-5(bpy)2(NO 3 ) 2]complexes (a)[GdCuL1 (bpy)2(NO3)2], (b)[GdCuL2(bpy)2 (NO3)2], (c)[GdCuL3(bpy)2(NO3)2], (d)[GdCuL4(bpy)2(NO3)2] and(e) [GdCuL5(bpy)2(NO3)2].
Fig. 6 Life time decay plot of thebinuclear [GdCuL1-5(bpy)2 (NO 3 )2]complexes (a)[GdCuL1 (bpy)2(NO3)2], (b)[GdCuL2(bpy) 2(NO3)2], (c)[GdCuL3(bpy)2(NO3)2], (d)[GdCuL4(bpy)2(NO3)2] and(e) [GdCuL5(bpy)2(NO3)2].

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DNA binding, Cleavage, Catalytic, Magnetic Active; 2,2–bipyridyl based d-f hetero binuclear Gd(III), Cu(II) Complexes and Their Electrochemical, Fluorescence Studies
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February 2022

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55 Reads

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2 Citations

Arabian Journal of Chemistry

A. Vijayaraj

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R. Prabu

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[...]

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Mani Govindasamy

Several 2,2-bipyridyl-based d-f heterobinuclear [GdCuL1-5(bpy)2(NO3)2] complexes are present, where (Ligand 1) (9E)-N¹-(2-Hydroxy-5-methylbenzylidene)–N²-((E)-2-(2-hydroxy-5-methyl benzylideneamino)ethyl)ethane-1,2-diamine. (Ligand 2) N¹,N¹-bis((E)-2-(2-hydroxy-5-methylbenzylideneamino)ethyl)ethane-1,2-diamine. (Ligand 3) (9E)-N¹-(2-((E)-2-(2-hydroxy-5-methylbenzylideneamino)ethylamino)ethyl)–N²-(2-hydroxy-5-methylbenzylidene)ethane-1,2-diamine. (Ligand 4) (9E)-N¹-(2-((E)-3-(2-hydroxy-5- methylbenzylideneamino) propylamino) ethyl)–N³-(2-hydroxy-5-methylbenzylidene)propane-1,3-diamine and (Ligand 5) (9E)-N-(2-hydroxy-5-methylbenzylidene)-3-(4-((E)-3-(2-hydroxy-5-methylbenzylideneamino)propyl)piperazin-1-yl)propan-1-amine. These compounds were described using spectroscopy and the elemental analysis method. Researches were conducted into the luminous, Genetic code, catalytic, magnetism, and breaking attributes of the [GdCuL1-5(bpy)2(NO3)2] complexes. In DMF with 0.1 M tetra-n-butylammonium perchlorate, the binuclear [GdCuL1-5(bpy)2(NO3)2] network complexes exhibit two one electron irreversible reduction events. VSM was used to calculate the complexes' magnetic susceptibility. There is ferromagnetic coupling in the [GdCuL1-5(bpy)2(NO3)2] complexes. The [GdCuL1-5(bpy)2(NO3)2] complexes' excited state lifetimes lengthen in the following order: [GdCuL5(bpy)2] [GdCuL1(bpy)2(NO3)2] [GdCuL3(bpy)2(NO3)2] [GdCuL4(bpy)2] and [GdCuL2(bpy)2(NO3)2]. The binuclear [GdCuL1-5(bpy)2(NO3)2] complexes' inceptive rate of progress for oxidizing 1,2-benzenediol to cyclohexa-3,5-diene-1,2-dione are longer chains with higher activity. Both the [GdCuL5(bpy)2(NO3)2] and [GdCuL4(bpy)2(NO3)2] complexes have strong DNA genetic code properties in the calf genus thymus. The complexes exhibit considerable singlet oxygen-mediated oxidative rift of circular recombinant plasmid pBR322 cloning vector in the existence of 2-sulfanylethanol.

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Synthesis of New Acyclic Schiff Base Oxovanadium(IV) Complexes and Their Electrochemical, Catecholase, and Antimicrobial Studies of Minimum Inhibitory Concentration

November 2015

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55 Reads

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5 Citations

Synthesis and Reactivity in Inorganic Metal-Organic and Nano-Metal Chemistry

Catalytically active complexes containing [VO(IV)L] were synthesized by using Schiff base ligands L1–5 and vanadyl sulfate. Ligands L1–5 were obtained by the condensation of 5-methylsalicylaldehyde with diethylene triamine (L1), tris(2-aminoethyl)amine (L2), triethylene tetramine (L3), N,N-bis(3-aminopropyl)ethylenediamine (L4) and N,N- bis(aminopropyl) piperazine (L5). All the complexes were characterized by elemental and spectral analysis. ESR spectra for the mononuclear [VO(IV)L] complexes show eight lines, square pyramidal geometry. Room temperature magnetic moment for the complexes was around 1.73 B.M. Electrochemical and catalytic studies of the complexes were compared on the basis of chain length of the imine compartment. All the [VO(IV)L1–5] complexes were screened antibacterial activity of MIC.


Synthesis, characterization, catalytic, antimicrobial, DNA binding and cleavage studies of N-functionalized tetraazamacrocyclic binuclear copper(II) complexes

June 2014

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39 Reads

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2 Citations

Journal of the Iranian Chemical Society

A series of binuclear copper(II) complexes of N-functionalized cyclam derivatives has been prepared by the Schiff base condensation of 1,8-[bis(3-formyl-2-hydroxy-5-methyl)benzyl]-l,4,8,11-tetraazacyclo-tetradecane (PC-a), 1,8-[bis(3-formyl-2-hydroxy-5-bromo)benzyl]-l,4,8,11-tetraazacyclo-tetradecane (PC-b) with appropriate aliphatic diamines, and copper(II) perchlorate. All the complexes were characterized by elemental, FT-IR, UV–Vis, ESI and ESR spectral analysis. The room temperature magnetic moment studies depicts the presence of an antiferromagnetic interaction in the binuclear complexes, which is also observed from the broad ESR spectra with a g value of 2.10–2.11. Variable-temperature magnetic susceptibility study of the complex [Cu2L2a](ClO4)2 shows that the calculated −2J value is 219 cm−1, which conveys a spin–spin interaction between the two copper(II) ions. The catechol oxidation and hydrolysis of 4-nitrophenylphosphate were carried out by using the complexes as a catalyst. All the above metal complexes were screened for antimicrobial and human pathogenic fungal activity. The binding of the complexes to calf thymus DNA (CT-DNA) has been investigated with UV–Vis and fluorescence spectroscopy. All complexes display significant cleavage property of circular plasmid pBR322 DNA into linear form. Spectral, electrochemical, magnetic and catalytic studies support the distortion of the copper ion geometry that arises as the macrocyclic ring size increases.


α-Fe2O3 nanoflowers: Synthesis, characterization, electrochemical sensing and photocatalytic property

June 2014

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226 Reads

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24 Citations

Journal of the Iranian Chemical Society

Nanoflower structured α-Fe2O3 was synthesized by adding hexamine to an aqueous solution of ferrous sulphate followed by drying and annealing at 600 °C for 6 h. X-ray diffraction analysis, Fourier-transformed infrared spectroscopy, Raman and DRS UV–visible absorption spectroscopy showed the formation of α-Fe2O3 with good crystalline nature. Field emission-scanning electron microscopy investigation revealed that the α-Fe2O3 has flower-like morphology, which is composed of nanorods. Cyclic voltammetry and chronoamperometry were used to investigate their electrochemical sensing property towards uric acid (UA). α-Fe2O3 exhibited enhanced sensing behavior with respect to that of bare GCE. Additionally, the α-Fe2O3 nanoflowers exhibit better photocatalytic activity of up to 71.7 % against rhodamine B (RhB) in short time of 60 min under visible light irradiation. It is found that the smaller crystallite size and flower-like morphology play a vital role in allowing an interaction between α-Fe2O3 and UA or RhB dye which enhances both the electrochemical sensing and photocatalytic activity.



Synthesis, characterization, crystal structure and biological studies on nicotinanilide based nickel(II), copper(II) and zinc(II) complexes

November 2013

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28 Reads

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2 Citations

Inorganica Chimica Acta

Three mononuclear Ni(II), Cu(II) and Zn(II) complexes were prepared by reacting the organic ligand Nphenyl-3-pyridinecarboxamide(NAL) and sodium azide with corresponding metal nitrates in MeOH medium. The isolated metal complexes were characterized by elemental analysis, electronic absorption and infrared spectra. The X-ray crystallographic analysis of the Zn(II) complex revealed a distorted tetrahedral geometry. The electronic spectrum of the Zn(II) complex showed characteristic peaks due to the ligand in the UV region and Cu(II) and Ni(II) complexes showed absorption bands both in UV and visible region. These spectral data suggest a distorted tetrahedral geometry for the metal complexes. Electrochemical studies of all the mononuclear complexes show one-electron irreversible reduction wave in the cathodic region while the nickel(II) complex shows one-electron irreversible oxidation wave in the anodic region. EPR spectra of the mononuclear copper(II) complex shows four lines, characteristic of a distorted tetrahedral geometry. All complexes when screened for antibacterial and antifungal activity, showed good antimicrobial activity.



Fabrication of iron oxide nanoparticles: Magnetic and electrochemical sensing property

April 2013

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105 Reads

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24 Citations

Journal of Materials Science: Materials in Electronics

In this paper, we report a simple synthesis of Fe2O3 nanoparticles using hydrothermal method. The formation of the sample was confirmed by X-ray diffraction analysis, X-ray photoelectron spectroscopy, Fourier transformed infrared spectroscopy, Raman spectroscopy and UV–Visible absorption spectroscopy. The average crystallite size of the synthesized Fe2O3 nanoparticles was estimated to be 61 nm and the particles were of good crystalline nature. Field emission-scanning electron microscopy study of the sample revealed that the Fe2O3 powder has rod-like morphology which is composed of nanoparticles. The vibrating sample magnetometer measurement shows that the nanoparticles possess ferromagnetic property. The synthesized Fe2O3 nanoparticles were used to modify glassy carbon electrode (Fe2O3/GCE) and the modified electrode was used to detect pyrocatechol (PC) in a pH 7.4 phosphate buffer solutions by cyclic voltammetry and chronoamperometry. At the Fe2O3/GCE, PC is oxidized at less positive potential with larger current response than the bare GCE. The proposed sensor exhibits great potential in the field of electrochemical sensing of PC.


Synthesis, characterization, catalytic, and biological studies of macrobicyclic binuclear nickel(II) complexes of 1,8-difunctionalized cyclam derivatives

January 2013

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15 Reads

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16 Citations

Journal of Coordination Chemistry

New Schiff base binuclear nickel(II) complexes of N-substituted cyclam derivatives have been prepared by template condensation of 1,8-[bis(3-formyl-2-hydroxy-5-bromo)benzyl]-l,4,8,11-tetraazacyclo-tetradecane (PC) with appropriate aliphatic diamines and nickel(II) perchlorate. The ligand possesses two coordination sites, an N4O2 amine compartment and N3O2/N4O2 imine compartment. The structural features of the complexes have been confirmed by elemental analysis, IR, UV–Vis, and mass spectra. From the data, octahedral geometry around the two nickels has been suggested. The electrochemical behavior of the complexes show two irreversible one-electron reduction process in the cathodic region and show two irreversible one-electron oxidation process at the anode. Hydrolysis of 4-nitrophenylphosphate using the complexes as catalysts have been carried out. Antimicrobial screening data show good results. The binding of the complexes to calf thymus DNA (CT DNA) has been investigated with absorption and emission spectroscopy. Ni2L1 displays significant cleavage of circular plasmid pBR322 DNA to linear form. Spectral, electrochemical, and catalytic studies support distortion of the nickel geometry that arises as the macrocyclic ring size increases.


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

November 2012

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34 Reads

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7 Citations

Bulletin of the Korean Chemical Society

A new series of acyclic mononuclear gadolinium(111) 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(Ill) complexes on the hydrolysis of 4-nitrophenylphosphate was determined. All gadolinium(III) complexes were screened for antibacterial activity.


Citations (18)


... 21 In recent times, rare Earth metals have been used as a dopant for various applications owing to their magnetic nature, high conductivity, luminescent, and electrochemical properties which are based on electron transfer occurring within the 4 f energy levels. [22][23][24] Furthermore, for electrochemical sensing, rare Earth metals have been proved as a key factor to improve the sensing performance because of their excellent catalytic nature, high surface basicity, and fast oxygen ion mobility. [25][26][27] The remarkable sensing properties have been noticed from the rare lanthanide series such as La, Ce, Nd, Er, Gd, Sm, and Tb. ...

Reference:

Synthesis of Gadolinium-Doped Molybdenum Diselenide Nanospheres for Ultrasensitive Electrochemical Determination of Essential Amino Acid in Human Serum and Milk Samples
DNA binding, Cleavage, Catalytic, Magnetic Active; 2,2–bipyridyl based d-f hetero binuclear Gd(III), Cu(II) Complexes and Their Electrochemical, Fluorescence Studies

Arabian Journal of Chemistry

... Those electronic and structural features are determinant to the success of vanadium complexes in a wide range of applications [30] . Vanadyl Schiff base complexes have been recently reported to act as insulin enhancing agents [ 28 , 31 , 32 ], antimicrobial [33][34][35][36] , antitumoral [36][37][38][39][40] , anhttps://doi. ...

Synthesis of New Acyclic Schiff Base Oxovanadium(IV) Complexes and Their Electrochemical, Catecholase, and Antimicrobial Studies of Minimum Inhibitory Concentration
  • Citing Article
  • November 2015

Synthesis and Reactivity in Inorganic Metal-Organic and Nano-Metal Chemistry

... Dipyridyl complexes of ruthenium have been reported to show high excited state potential. However, these complexes are not very efficient DNA intercalators 23 . Phenanthroline complexes of ruthenium, on the other hand, are reported to bind DNA intercalatively 24 . ...

Spectral, Electrochemical, Fluorescence, Kinetic and Anti-microbial Studies of Acyclic Schiff-base Gadolinium(III) Complexes
  • Citing Article
  • November 2012

Bulletin of the Korean Chemical Society

... The polymerization of AnA caused by peroxydisulphate was examined using FTIR, UV-visible, HRTEM, and TGA [8]. Ranganathan et al. reported the PAnA microspheres [9]. Researchers developed a poly(aminobenzoicacid)/TiO 2 nanocomposite and studied its photocatalytic characteristics [10]. ...

Poly(anthranilic acid) Microspheres: Synthesis, Characterization and their Electrocatalytic Properties

Bulletin of the Korean Chemical Society

... Past two decades, transition metal sulfide has drawn incredible attention over metal oxides due to their higher charge carrier migration, suitable bandgap, plenty of exposed active sites, and excellent light absorption ability [17,18]. Among the metal sulfides, CdS is a more potent one due to its direct band gap, appropriate band potential, sufficient absorption coefficient, and photoelectrochemical activity [19,20]. On the contrary, because it is a single material, it has some drawbacks like carriers are not efficiently migrating from inside the catalyst to its surface as a result low photogenic charge-hole recombination occurs. ...

27. Cadmium Sulphide Nanorods: Synthesis, Characterization and Their Photocatalytic Activity.K. Giribabu, R. Suresh, R. Manigandan, A. Vijayaraj, R. Prabu and V. Narayanan.Bull. Korean Chem. Soc., (Accepted, 2012).Impact Factor: 1.156.

Bulletin of the Korean Chemical Society

... The absorption peak at 3436 cm −1 is due to the − OH stretching vibration of water adsorbed [14]. The signal at 1631 cm −1 was due to the bending vibration of HOH [15]. The absorption band at 1388 cm −1 was caused by OH deformation [16]. ...

Facile synthesis of cobalt doped hematite nanospheres: Magnetic and their electrochemical sensing properties
  • Citing Article
  • June 2012

Materials Chemistry and Physics

... Various nickel(II) and cobalt(II) complexes including biological activity such as antifungal, antibacterial, anti-inflammatory, antioxidant and antiviral have been reported [33][34][35][36][37][38][39]. Also, several Ni(II) and Co(II) complexes acting as DNA intercalators or DNA-cleaving agents were studied in the literature [40][41][42]. Picolines and pyridine derivatives have many biological properties such as antibacterial, antifungal activities and physiological functions. Their biological properties have also been reported to further increase after they bind to transition metal ions [43][44][45]. ...

Synthesis, characterization, catalytic, and biological studies of macrobicyclic binuclear nickel(II) complexes of 1,8-difunctionalized cyclam derivatives
  • Citing Article
  • January 2013

Journal of Coordination Chemistry

... Iron oxide structures (mainly Fe 2 O 3 ) have been reported for the development of non-enzymatic sensors for biomolecules because of their chemical stability, low toxicity, high conductivity, catalytic properties, low cost, 112 abundance, biocompatibility, and electrocatalytic properties. 113 One of the first reports about the non-enzymatic detection of UA using α-Fe 2 O 3 was the proposal of Suresh et al. 92 who dispersed α-Fe 2 O 3 nanoflowers in a GCE and were able to demonstrate the ability to the modified electrode α-Fe 2 O 3 /GCE to oxidize UA at a lower potential (480 mV) compared to an unmodified GCE (600 mV) by Cyclic voltammetery (CV). Chronoamperometry (CA) was used as the analytical technique with a linear concentration range from 7.9 μM to 67 μM, but LOD was not reported. ...

α-Fe2O3 nanoflowers: Synthesis, characterization, electrochemical sensing and photocatalytic property
  • Citing Article
  • June 2014

Journal of the Iranian Chemical Society

... The fluorescence emission spectra were analyzed under three temperatures via Stern-Volmer equation which is also very useful to elucidate the quenching mechanism type in the DNA/BSA binding system, given as Eq. (9) [75,76]: ...

Synthesis, characterization, catalytic, antimicrobial, DNA binding and cleavage studies of N-functionalized tetraazamacrocyclic binuclear copper(II) complexes
  • Citing Article
  • June 2014

Journal of the Iranian Chemical Society

... The integration of nanomaterials [27][28], such as iron oxide nanoparticles (Fe2O3-NPs), into electrochemical sensors has significantly enhanced their performance. Metal oxides have attracted considerable attention among the various materials utilized in electrochemical sensors [29][30][31][32][33][34][35].Iron oxide nanoparticles [36][37][38][39] are particularly attractive due to their high surface area, excellent conductivity, and ease of modification, making them ideal candidates for detecting metal ions in aqueous environments. ...

Fabrication of iron oxide nanoparticles: Magnetic and electrochemical sensing property
  • Citing Article
  • April 2013

Journal of Materials Science: Materials in Electronics