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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.
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.
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.
Stimuli-Sensitive Poly(NIPA-co-APA) Hydrogels for the Controlled Release of Keterolac Tromethamine
Kim, Yonghyun,Babu, V. Ramesh,Rao, K.S.V. Krishna,Lim, Jae-Min,Thangadurai, T. Daniel,Lee, Yong-Ill Korean Chemical Society 2014 대한화학회지 Vol.58 No.1
The pH sensitive hydrogels composed of N-isopropylacrylamide (NIPA) and acryloyl phenylalanine (APA) were prepared by redox polymerization using N,N'-methylenebisacrylamide (MBA) as a crosslinker. Anti-inflammatory and analgesic agent, Keterolac Tromethamine (KT), was loaded successfully into poly(NIPA-co-APA) copolymeric hydrogels by swelling equilibrium method. To understand the nature of drug in the polymeric matrix, the newly synthesized drug loaded poly(NIPA-co-APA) copolymeric hydrogels were characterized by using differential scanning calorimetry (DSC) and X-ray diffraction (XRD) techniques. The scanning electron microscopy (SEM) technique result indicates the spherical smooth surface of the hydrogels. The drug (KT) releasing nature of the poly(NIPA-co-APA) hydrogels was studied in pH 1.2 and 7.4. Effects of drug loading, crosslinking agent, pH and the ionic strength of the external medium on swelling of hydrogels were also investigated.