990 resultados para CU-2
Resumo:
Copper(I) complexes with {Cu(2-S)N}4 and {Cu(3-S)N}12 core portions of butterfly-shaped or double wheel architectures have been isolated in the reaction of Cu(I) with the Schiff base ligand C6H4(CHNC6H4S)2, aiso-abt, under different conditions. View the MathML source containing the tetranuclear electroneutral complex View the MathML source is formed by the reaction of CuI in acetonitrilic solution and recrystallization from DMF, whereas View the MathML source containing dodecanuclear View the MathML source wheels is accessible starting from CuBF4. Complexes 2 and 4 represent the first examples of cyclic complexes with the same overall stoichiometry but different ring sizes. The ligand induces two different coordination environments around copper(I) by switching between 2- and 3-sulfur bridging modes.
Resumo:
Phase diagram studies show that at ambient pressure only one ternary oxide, Cu(2)Ln(2)O(5), is stable in the ternary systems Cu-Ln-O (Ln = Tb, Dy, Ho, Er, Tm, Yb, Lu) at high temperatures. The crystal structure of Cu(2)Ln(2)O(5) can be described as a zig-zag arrangement of one-dimensional Cu2O5 chains parallel to-the a-axis with Ln atoms occupying distorted octahedral sites between these chains. Four sets of emf measurements on Gibbs energy of formation of Cu(2)Ln(2)O(5) (Ln = Tb, Dy, Ho, Er, Tm, Yb, Lu; Y) from component binary oxides and one set of high-temperature solution calorimetric data on enthalpy of formation have been reported in the literature. Except for Cu2Y2O5, the measured values for the Gibbs energies of formation of all other Cu(2)Ln(2)O(5) compounds fall in a narrow band (+/-1 kJ mol(-1)) and indicate a regular increase in stability with decreasing ionic radius of the lanthanide ion. The values for the second law enthalpy of formation, derived from the temperature dependence of emf obtained in different studies, show larger differences, as high as 25 kJ mol(-1) for Cu2Tm2O5. Though associated with an uncertainty of +/-4 kJ mol(-1), the calorimetric measurements help to identify the best set of emf data. The trends in thermodynamic data correlate well with the global instability index (GII) based on the overall deviation from the valence sum rule. Low values for the index calculated from crystallographic information indicate higher stability. Higher values are indicative of the larger stress in the structure.
Resumo:
Noble metal ion substituted CeO(2) in the form of Ce(0.98)M(0.02)O(2-delta) solid solution (where M = Pt, Pd, Cu) are the new generation catalysts with applications in three-way exhaust catalysis. While adsorption of CO on noble metals ions is well-known, adsorption of CO on noble metal ions has not been studied because creating exclusive ionic sites has been difficult. Using first-principles density functional theory (DFT) we have shown that CO gets adsorbed on the noble metal Pt(2+), Pd(2+), Cu(2+) ionic sites in the respective compounds, and the net energy of the overall system decreases. Adsorption of CO on metal ions is also confirmed by Fourier transform infrared spectroscopy (FTIR).
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(MDA)SH(SODGPX),(Cd)(Cu)(Cannaindica Linn.),20μmol·L~(-1)100μmol·L~(-1)Cd~(2+)Cu~(2+)MDA,100μmol·L~(-1)Cd~(2+),MDACu~(2+),Cd~(2+)GSH,PCs
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Cu2+(0.01,0.1,1,10,50,100,200mg/L)(Chlorococcumsp.).,Cu2+.BG11,0.011mg/LCu2+,,,;(10200mg/LCu2+),,,1.Cu2+(0.01,0.1mg
Resumo:
Cd2 + Cu2 + BF5(TetrahymenathermophilaBF5) , :Cd2 + (0 0 .4mgL-1)Cu2 + (0 10mgL-1) ,Cd2 + (0 .8 3.2mgL-1)Cu2 + (2 0 2 0 0mgL-1) ;Cd2 + Cu2 + IC50 2 .0 4mg/L15 5 .5mg/L ;
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Cu2 + ,Cu2 + Kinneret ,Cu2 + Kinneret , ,Cu2 + , ,Cu2 + Kinneret , 2 0
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, , , 5d ,Cu2 + , 54KDa ;Zn2 + , 94KDa ,67KDa 40KDa
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μ
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Cu2+,pHCu2+Cu2+,;pH6Cu2+20 mg/L0.25 mm,,,Na+Ca2+Cu2+,0.1mol/L HCl96.1%Cu2+Thomas,10.94mg/gCu2+,
