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Thangadurai, T.Daniel,Ihm, Son-Ki 한국공업화학회 2003 Journal of Industrial and Engineering Chemistry Vol.9 No.5
A series of new hexa-coordinated ruthenium (II) carbonyl complexes of the type [Ru(CO)(L')(B)] (L'= tetradentate Schiff bases; B = PPh₃ or pyridine (py) or piperidine (pip) or morpholine (morph)) have been synthesised by the reactions of [RuHCl(CO)(PPh₃)₂(B)] (B = PPh₃ or py or pip or morph) with appropriate Schiff bases having the donor groups (0,N) viz., 2-hydroxy- 1 -naphthaldehyde ethylenediimine (L 1 ) or 2-hydroxy- 1 -naphthaldehyde- 1,2-propylenediimine (L2) or 2-hydroxy- 1 -naphthaldehydetetramethylenediimine (L3) in 1 : 1 molar ratio. Ligands and all the complexes have been characterised on the basis of elemental analyses and spectral (IR, electronic,¹ H- and^31'P-NMR) data and an octahedral structure has been tentatively proposed for all the complexes. The catalytic activity for alcohol oxidation and antibacterial activities were also carried out for these new complexes.
Thangadurai, T. Daniel,Ihm, Son-Ki 한국공업화학회 2003 Journal of Industrial and Engineering Chemistry Vol.9 No.5
Chiral Schiff base ruthenium (111) complexes of the type [RuX(LL')(EPh₃)] (X = CI or Br; LL'= chiral Schiff base; E = P or As) have been synthesised by the reactions of [RuX₃(EPh₃)₃] or [RuBr₃(PPh₃)₂(MeOH)] with appropriate Schiff bases having the donor groups (0,N) viz., bis[3( 1'-naphthy1)salicylidenecy clohexanediimine](L 1 )orbis[3( 1'-naphthyl)salicylidenepropylenediimine] (L2) or bis[3(1'-naphthy1)salicyliden ediphenyldiimine] (L3) in 1 : 1 molar ratio. The characterisation of the complex was done by elemental analyses and spectral (IR, UV-visible and EPR), electrochemical and magnetic moment data. An octahedral structure has been tentatively proposed for all the new complexes. The catalytic and antibacterial activities have also been carried out for these new complexes.
Sivanesan, Dharmalingam,Kannan, Sethuraman,Thangadurai, Thangaian Daniel,Jung, Kwang-Deog,Yoon, Sungho The Royal Society of Chemistry 2014 Dalton Transactions Vol.43 No.30
<P>The synthesis and physical properties of dimanganese(<SMALL>II</SMALL>) compounds with varying numbers of water ligands housed in the four bulky carboxylate motifs, including the first complex with a parallelogram core {Mn<SUB>2</SUB>(μ-OH<SUB>2</SUB>)<SUB>2</SUB>(μ-O<SUB>2</SUB>CR)}<SUP>3+</SUP> unit, are described. The isolation of these complexes revealed how water could alter the structural and electrochemical properties of similar carboxylate-bridged dimanganese(<SMALL>II</SMALL>) cores that may occur in a variety of active sites of Mn-containing metalloenzymes. These studies support the notion that water molecules in coordination spheres of active sites of metalloproteins are not a simple spectator medium but the modulation factor of structures and functions.</P> <P>Graphic Abstract</P><P>The three manganese complexes with the {Mn<SUB>2</SUB>(μ-O<SUB>2</SUB>CR)}<SUP>3+</SUP>, {Mn<SUB>2</SUB>(μ-OH<SUB>2</SUB>)<SUB>2</SUB>(μ-O<SUB>2</SUB>CR)}<SUP>3+</SUP>, and {Mn<SUB>2</SUB>(OH<SUB>6</SUB>)<SUB>2</SUB>(O<SUB>2</SUB>CR)}<SUP>3+</SUP> motifs are in dynamic equilibrium, displaying significantly different electrochemical properties ranging from 0.52 V to 1.19 V <I>vs.</I> Fc/Fc<SUP>+</SUP>. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4dt00520a'> </P>
R. Sivabalan,K. R. Thangadurai,K. Lenin 한양대학교 세라믹연구소 2021 Journal of Ceramic Processing Research Vol.22 No.6
The aim of this research study is the investigating the properties of a hybrid Magnesium (Mg) Metal Matrix Composite(MMC) fabricated using integrated squeeze cum stir casting setup. The challenges of this liquid metallurgy processing routeare non-uniform distribution and agglomeration of reinforcement particles; this could cause poor quality in composites, whichmight result in ruining the value of the properties and performance of the fabricated composites. The primary and secondaryreinforcements investigated on this study are Silicon Nitride (Si3N4) and Aluminium Oxide (Al2O3) respectively. Magnesiumalloy (ZE41A- mainly based on zinc, zirconium and cerium) was taken as base metal with micron sized Silicon Nitride (Si3N4)as primary reinforcement. Aluminum Oxide(Al2O3) is employed as secondary reinforcement to fabricate hybrid magnesiumMMC of different weight fractions; (a) Pure Mg (ZE41A), (b) 1 wt% of Si3N4 and 1wt% of Al2O3, (c) 2 wt% of Si3N4 and2 wt% of Al2O3, (d) 3 wt% of Si3N4 and 3 wt% of Al2O3 and (e) 4 wt% of Si3N4 and 4 wt% of Al2O3. The fabricated compositesare analyzed for metallurgical, mechanical characterization and tribological behavior by optical microscopic analysis, SEMimaging, and EDAX analyses. The maximum ultimate tensile strength observed is 201.5 MP, a 11.93% increase than pure MgZE41A base alloy.
Kalichamy Kaniappan,Salem Chandrasekaran Murugavel,Thangaian Daniel Thangadurai 한국고분자학회 2013 Macromolecular Research Vol.21 No.10
A series of homo and copolyphosphonate derivatives were synthesized by interfacial polycondensation reactions of 1,3-bis(4-hydroxyphenyl)propenone with phenylphosphonic dichloride and terephthaloyl chloride, and 3-(4-hydroxy-3-methoxyphenyl)-1-(4-hydroxyphenyl)propenone with phenylphosphonic dichloride and terephthaloyl chloride using a phase transfer catalyst at ambient temperature. The diol monomers were prepared by condensing 4-hydroxy benzaldehyde and 3-methoxy-4-hydroxybenzaldehyde with 4-hydroxy acetophenone. The structures of the synthesized monomers and polymers were confirmed using UV, IR and 1H, 13C, and 31P NMR spectroscopic techniques. The molecular weights of the polymers were determined by gel permeation chromatography. The thermal properties of the polymers were studied by thermogravimetric analysis and differential scanning calorimetry under a nitrogen atmosphere. The photosensitive property of the polymers in films and solution states was investigated by ultraviolet spectroscopy. Photocrosslinking proceeded via a 2π+2π cycloaddition reaction of α,β-unsaturated carbonyl group. The chemical and physical properties of methoxy substituted polymers were compared to those of the unsubstituted polymers. The structure-property relationships and flame retardant characteristics of the synthesized polymers were also studied.
Yonghyun Kim,V. Ramesh Babu,Daniel T. Thangadurai,K.S.V. krishna Rao,Hyeongrae Cha,김창대,주우홍,이용일 대한화학회 2011 Bulletin of the Korean Chemical Society Vol.32 No.2
Copolymeric silver nanocomposite hydrogels were synthesized by using acryloyl phenylalanine (APA), N'-isopropylacrylamide (NIPAM) and crosslinked by N,N-methylene bisacrylamide (MBA) via radical redox polymerization. Present study allows entrapping silver nanoparticles into hydrogel networks. UV-visible spectroscopy and X-ray diffraction (XRD) studies confirmed the formation of silver nanoparticles in hydrogel matrix. 11% of weight loss difference between hydrogel and silver nanocomposite hydrogel is clearly indicates the formation and silver nanoparticles by thermo-gravimetrical analysis. The order of swelling capacity values of hydrogels and silver nanocmposite hydrogels were found to be in the order of placebo copolymeric hydrogel >Ag-copolymeric silver nanocomposite hydrogels. The particle size of silver nanoparticles was analysed and are in the range of 5 - 10 nm which has been confirmed by transmission electron microscopy (TEM) as well as particle size analysis. The silver anocomposite hydrogel has shown very good antibacterial activity on gram-positive and gram-negative bacteriocides.
Shim Jimin,Tawfik Salah M.,Thangadurai Daniel T.,Lee Yong‐Ill 대한화학회 2021 Bulletin of the Korean Chemical Society Vol.42 No.7
The ability to detect pathogenic microbes in water and food samples is of prominent interest, but it remains a great challenge. Herein, we report a simple fluorescence sensor based on amphiphilic conjugated polythiophene (ACPT) for the detection of gram-negative pathogenic bacteria, Escherichia coli, in pH 7.0. The ACPT sensor was synthesized by the oxidative polymerization of water-soluble thiophene monomers in an aqueous solution. The ACPT sensor undergoes the fluorescence “turn on” response at 432 nm upon the addition of E. coli. The ionic complex, which is generated by electrostatic interaction during the short incubation time of 15 min, resulting in the enhancement of the fluorescence intensity of ACPT. The application of ACPT enables the detection of E. coli pathogens in tap water and milk samples with good recoveries of 96.94–100.83% and 93.27–116.75%, respectively, and excellent reproducibility (n = 3, relative standard deviation [RSD] = 1.78%). The current findings pave the way for the promising application of a novel ACPT system that could be used in food safety and environmental monitoring.
Kim, Yong-Hyun,Babu, V. Ramesh,Thangadurai, Daniel T.,Rao, K.S.V. krishna,Cha, Hyeong-Rae,Kim, Chang-Dae,Joo, Woo-Hong,Lee, Yong-Ill Korean Chemical Society 2011 Bulletin of the Korean Chemical Society Vol.32 No.2
Copolymeric silver nanocomposite hydrogels were synthesized by using acryloyl phenylalanine (APA), N'-isopropylacrylamide (NIPAM) and crosslinked by N,N-methylene bisacrylamide (MBA) via radical redox polymerization. Present study allows entrapping silver nanoparticles into hydrogel networks. UV-visible spectroscopy and X-ray diffraction (XRD) studies confirmed the formation of silver nanoparticles in hydrogel matrix. 11% of weight loss difference between hydrogel and silver nanocomposite hydrogel is clearly indicates the formation and silver nanoparticles by thermo-gravimetrical analysis. The order of swelling capacity values of hydrogels and silver nanocmposite hydrogels were found to be in the order of placebo copolymeric hydrogel >Ag-copolymeric silver nanocomposite hydrogels. The particle size of silver nanoparticles was analysed and are in the range of 5 - 10 nm which has been confirmed by transmission electron microscopy (TEM) as well as particle size analysis. The silver nanocomposite hydrogel has shown very good antibacterial activity on gram-positive and gram-negative bacteriocides.