Synthesis & Vibrational Spectra of Dioxouranium(VI), Th(IV), Zr(IV) & Oxozirconium(IV) Chlorosulphates &Their Complexes with Some Organic Donors

1056-105

Synthesis and characterization of Mn(II), Co(II), Ni(II), Cu(II), Zn(II), Cr(III), Fe(III), Ru(III) and Rh(III) complexes with 1,1- (2,6-pyrimidyl) bisbenzothiazole-2-thione

161-164Metal complexes with I, 1-(2,6-pyrimidyl)bisbenzothiazole- 2-thione (PBT) of the type M(PBT)2CI2 M'2 (PBT)2CI6 where Mh= Mn(II), Co(II), Ni(II), Cu(lI) and Zn(lI) and M' = Cr(lll), Fe(III), Ru(III) and Rh(III) have been synthesized and characterized by elemental analysis, magnetic susceptibility, IR, lH NMR and electronic spectral studies. The results reveal that the ligand is coordinating through pyrimidine N- and thiocarbonyl S- atoms of the mercaptobenzothiazolyl group. The M(PBT)2CI2 .complexes appear to be octahedral whereas M'2(PBT)2CI6 complexes are proposed to have a chlorine-bridged dimeric octahedral structure

Synthesis and spectral studies of some transition metal complexex of potassium bis(bismuthiol-I-yl) borate

882-884Potassium bis(bismuthiol-I-yl)borate and some of its complexes of the type MLn [where n = 2 for M = Mn(II), Co(ll). Ni(II), Cu(II) and Zn(II), and n =3 for M = Cr(III) and Fe(II)] have been synthesized. They have been characterized by elemental analysis, magnetic susceptibility measurements, and electronic- and infrared spectral studies. On the basis of the magnetic moment and electron c spectral data an octahedral geometry is proposed for Cr(III) and Fe(II) complexes. A square-planar structure has been proposed for Mn(II), Co(II), Ni(II) and Cu(II) complexes. The ligand field parameters 10 Dq, and β calculated for Cr(III) and Fe(III) indicate that the ligand may be placed between EDTA and H2O in nephelauxetic series

Synthesis and characterization of the complexes of chromium(III), manganese(ll), iron(III), cobalt(ll), nickel(ll) and copper(ll) with 5-( 2-hydroxybenzylidene)aminobenzopyrazole

655-657Complexes of Cr(III), Mn(II), Fe(III), Co(II), Ni(II) and Cu(II) with 5-(2-hyroxybenzylidene)aminobenzopyrazole (HBAB) have been prepared and characterized. The IR spectral studies indicate that the ligand act as a bidentate donor and coordinates through the nitrogen of the azomethine group and deprotonated OH group. The complexes [M(HBAB)3] (M=Cr, Fe) and [M(HBAB)2-2H2O](M=Mn, Co, and Ni) have been assigned an octahedral geometry whereas Cu(HBAB)2 is proposed to be square-planar. The ligand field parameters, 10Dq and B have also been calculated

Synthesis and characterization of chromium(lll), manganese(ll), iron(III), cobalt(ll), nickel(ll), copper(Il), zinc(II), mercury(ll), ruthenium(III), rhodium(III), platinum(IV) and gold(III) complexes with 1-(2'-pyridyl)benzothiazole- 2-thione

153-156A new ligand 1-{2'-pyridyl)benzothiazole-2-thione and its complexes with Cr(III), Mn(II), Fe(III), Co(II), Ni(II), Cu(II), Zn(II), Hg(II), Ru(III), Rh(III), Pt{IV) and Au(III) have been synthesized and characterized by elemental analysis, IR, 1H NMR, UV/Vis spectral data, molar conductance and magnetic susceptibility measurements. Conductivity measurement in DMSO show the non-ionic nature of Ru(III), Rh(III), Hg(II) and Au(III) complexes. The IR spectral studies reveal that the ligand is bidentate coordinating through the pyridine N-atom and thiono S-atom. An octahedral geometry has been proposed for all the complexes except that of Au(III) which has tentatively been assigned trigonal bipyramidal structure

Adsorptive removal of Pb(II) and Zn(II) from water onto manganese oxide-coated sand: Isotherm, thermodynamic and kinetic studies

AbstractManganese oxide-coated sand, MOCS, was synthesized and characterized by XRD, FTIR, SEM, and EDX techniques, and was used for the adsorption of Pb(II) and Zn(II) from their aqueous solutions. The metal ion concentration, contact time, MOCS dose and pH of the solutions were optimized. Langmuir, Freundlich, Temkin and Dubinin–Radushkevich isotherms were studied and the maximum adsorption capacities for Pb(II) and Zn(II) were found to be 147.06 and 116.28 µg/g at 40 °C and 27 °C, respectively. These values are higher than many tested adsorbents. The energy 0.011 and 0.079 kJ/mol for Pb(II) and Zn(II) indicated adsorption as physical process. In thermodynamics the free energy change for Pb(II) ranged between −12.344 and −11.371 kJ/mol and that for Zn(II) ranged −9.638 to −11.155 kJ/mol between 27 and 40 °C that predicted the spontaneity of process. The enthalpy change −39.816 and 25.574 kJ/mol indicated the exothermic and endothermic nature of the adsorption of Pb(II) and Zn(II). Kinetic studies indicated that Pb(II) adsorption followed pseudo-second order, whereas Zn(II) followed partial pseudo-first and pseudo-second order rates. The adsorptions of both metals were controlled by film diffusion step

Removal of some basic dyes from artificial textile wastewater by adsorption on Akash Kinari coal

355-364The removal of three dyes, methylene blue, malachite green, and rhodamine B from aqueous solutions at different concentrations, pH and temperatures by Akash Kinari coal has been studied. It has been found that per cent adsorptions of methylene blue, malachite green, and rhodamine B onto the adsorbate decrease from 97.18 to 83.90, 89.16 to 79.77 , and 78.40 to 67.35, respectively, when their concentrations in solutions are increased from 5 to 20 mg/L at 30±1 °C and at pH 6.8, 7.2 and 5.8, respectively. The rate constants of adsorption (Kad) for methylene blue, malachite green, and rhodamine B are found to vary between 4.27-3.95 x 10-2, 4.53-4.61 x 10-2 and 4.39-4.20 x 10-2 /min at 20, 30, and 40 °C, respectively. The calculated values of the Langmuir constant for adsorption capacity of the dyes (Qo) on the adsorbent at different temperatures vary from 2.12 to 1.59, 2.68 to 1.15 and 1.23 to 0.78 mg/g. There is an increase in the adsorption of methylene blue, malachite green, and rhodamine B from 74.39 to 92.80 per cent, 62.16 to 83.42 per cent, and 51.57 to 71.78 per cent, respectively (at 30±1 °C and 10 mg/L concentration) with increase in pH from 3.8 to 7.2. The adsorption of dyes, however, decreases beyond pH 7.2. Various thermodynamic parameters (G °, H ° and S °) have also been calculated. The results show that Akash Kinari coal is a good adsorbent for removal of colour from textile wastewater

Synthesis & characterization dioxouranium(VI), oxovanadium(I) and hydroxozirconium(IV) complexes of poly(imidazolyl)borate anion

916-918Several five-, six- or eight-coordinated complexes of dioxouranium(VI), oxovanadium(IV) and hydroxozirconium(IV) with dihydridobis(imidazolyl)borate (DIB), hydridotris(imidazolyl)borate (HIE) and tetrakis(imidazolyl) borate (TIB) have been prepared an characterized on the basis of analytical data, infrared and electronic spectra and magnetic susceptibility measurements. U - O bond length and force constant for dioxouranium complexes have also been calculated

Synthesis & Characterization of Eu(III), Tm(III) & Yb(III) Chlorosulphates & Their Complexes with 2-Aminothiazole & 5-Aminoindazole

705-70

Performance evaluation of waste plastic/polymer modified bituminous concrete mixes

975-979This paper describes comparative performance of properties of bituminous concrete mixes containing plastic/polymer (PP) (8% and 15% by wt of bitumen) with conventional bituminous concrete mix (prepared with 60/70 penetration grade bitumen). Significant improvement in properties like marshall stability, retained stability, indirect tensile strength and rutting was observed in PP modified bituminous concrete mixes