NOPR Collection:

Cellulose acetate based thorium (IV) phosphate as a new and novel hybrid fibrous cation exchanger: Synthesis, characterization and thermal analysis

Fri, 01 Sep 2006 00:00:00 GMT

Title: Cellulose acetate based thorium (IV) phosphate as a new and novel hybrid fibrous cation exchanger: Synthesis, characterization and thermal analysis Authors: Varshney, K G; Drabik, M; Agrawal, Arun Abstract: Cellulose acetate based thorium(IV) phosphate (CAThP) has been synthesized as a new phase of hybrid fibrous cation exchanger by mixing thorium nit rate, phosphoric acid and cellulose acetate in different proportions to obtain a material of optimum ion exchange properties. It has been characterized by using IR, TGA, XRD and SEM studies in addition to its ion exchange capacity, elution, concentration and pH titration. Extensive thermogravimetric studies have been performed to evaluate the behaviour of the material and its tentative structure. Page(s): 2045-2047

Synthesis and characterization of cobalt (II) complexes of chromen-2-one-3-carboxy hydrazide and 2-(chromen-2'-onyl)-5-(aryl) 1,3,4-oxadiazole derivatives

Fri, 01 Sep 2006 00:00:00 GMT

Title: Synthesis and characterization of cobalt (II) complexes of chromen-2-one-3-carboxy hydrazide and 2-(chromen-2'-onyl)-5-(aryl) 1,3,4-oxadiazole derivatives Authors: Mathew, Glory; Suseelan, M S; Krishnan, R Abstract: Cobalt(II) complexes or chromen-2-one-3-carboxy hydrazide and 2-(chromen-2'-onyl)-5-(aryl) 1,3,4-oxadiazole derivatives have been synthesized and characterized by elemental analysis, magnetic suscecptibility, molar conductance, spectral studies [IR, UV-vis,and ¹H NMR]. All the Co(II) complexes exhibit the composition M(Ln )₂X₂: where M = Co(II). Ll is chromcn-2-one-3-carboxy hydrazide, L2 is 2-(chromen-2ʹ-onyl)-5-(2"hydroxylphenyl) 1,3,4-oxadiazole, L3 2-(chromen-2'-onyl)-5-(4 "nitrophenyl) 1,3,4-oxadiazole and L4 is 2-(chromen-2 '-onyl)-5-(4"-chlorophenyl) 1,3,4 -oxadiazole. X = Cl^-, Br^-, NO₃^-, CH₃COO^-,ClO₄^- , CNS^-, SO₄^--. The N,O donor ligands act as a bidentate ligand in all the complexes. Di storted octahedral geometry for all the Co(II) complexes is proposed. X-ray structure determination have been made for the exact definition of the coordination sphere. The newly synthesized Co(II) complexes have been screened for their antimicrobial activity against some bacterial species like E. coli,S. aureus, Pseudomonas aeruginosa and few fungal strains, C. albicans and Cryptococcus neoformans. Page(s): 2040-2044

Synthesis and luminescence spectral properties of europium (III) and terbium (III) complexes with a new Schiff base ligand N,Nʹ,Nʹʹ-tri-(2,4-dihydroxyl-acetophenone)tri aminotriethylamine

Fri, 01 Sep 2006 00:00:00 GMT

Title: Synthesis and luminescence spectral properties of europium (III) and terbium (III) complexes with a new Schiff base ligand N,Nʹ,Nʹʹ-tri-(2,4-dihydroxyl-acetophenone)tri aminotriethylamine Authors: Yang, T L; Qin, W W Abstract: A new Schiff base ligand with tripodal structure, N,Nʹ,Nʹʹ-tri-(2,4-dihydroxyl-acetophenone)triaminotriethylamine (H₆L), and its complexes with europium (III) and terbium (III) have been synthesized. The complexes have been characterized by element analysis, IR spectra, mass spectra, thermal analysis and molar conductivity. The europium (I II) and terbium (III) cations coordinate with the Schiff base nitrogen atoms, the bridgehead nitrogen atoms and phenolic hyd rox yl oxygen atoms of the ligand. The luminescence properties of the complexes in DMSO, THF, DMF, MeCN and CH₃OH solvents have also been investigated. Under the excitation of UV light, these complexes exhibit characteristic of europium (III) and terbium (III). The solvent factors influencing the luminescence intensity are also discussed. Tentative structures for the complexes have been proposed based on the experimental results. Page(s): 2035-2039

Viscosity behaviour of poly(caprolacton-dimethyl methacrylate) / poly(ethylene glycol) blends in various solvents

Fri, 01 Sep 2006 00:00:00 GMT

Title: Viscosity behaviour of poly(caprolacton-dimethyl methacrylate) / poly(ethylene glycol) blends in various solvents Authors: Yilmaz, Sevil Savaskan; Kul, Dilek; Usta, Asu; Ozturk, Temel; Misir, Murat Abstract: Viscosity behaviour has been studied for poly(caprolacton-dimethyl methacrylate) (PCL-DM), poly(ethylene glycol) (PEG) and the blends (50:50) of PCL-DM/PEG in tetrahydrofuran (THF), N,N'-dimethyl formamide (DMF), and chloroform (CHCl₃) at 25°C. The blends have been characterized to evaluate their compatibility during the viscosity measurements. The influence of solvent upon the viscosity of dilute solutions of PCL-DM/ PEG blends has also been investigated . Page(s): 2031-2034