The fullerene complexes, η2-C70[RhCl（CO）（PPh3）2]n（n=1, 2）, have been prepared by the reaction of C70 with RhCl（CO）（PPh3）2 in methylbenzene at room temperature. The new complexes were characterized by UV-Vis...The fullerene complexes, η2-C70[RhCl（CO）（PPh3）2]n（n=1, 2）, have been prepared by the reaction of C70 with RhCl（CO）（PPh3）2 in methylbenzene at room temperature. The new complexes were characterized by UV-Vis spectra, IR, XPS and elemental analysis. The results show that the complexes of η2 form can be formed by RhCl（CO）（PPh3）2 bonding to C70 in theσ-π way. In addition, the complexes structures have been supposed.展开更多
Multiple coordination modes are present copper coordination environment varies in the CuII-histidine complex in solution and the with pH. In this work, we have investigated the coordination geometry of Cu（His）2 comp...Multiple coordination modes are present copper coordination environment varies in the CuII-histidine complex in solution and the with pH. In this work, we have investigated the coordination geometry of Cu（His）2 complex using X-ray absorption fine structure （XAFS） analysis. Copper K-edge XAFS spectra were acquired on aqueous Cu2＋ samples with his- tidine at different pH values. The coordination environments were further confirmed by chemically modified histidine. Results show that the caboxylate groups coordinate at acidic condition, while amino and imidazole nitrogens get coordinated at higher pH. For the co- ordination geometry of Cu（His）2 in solution at physiological pH, the sixfold coordination is preferentially formed, while the fivefold coordination can co-exist in equilibrium.展开更多
文摘The fullerene complexes, η2-C70[RhCl（CO）（PPh3）2]n（n=1, 2）, have been prepared by the reaction of C70 with RhCl（CO）（PPh3）2 in methylbenzene at room temperature. The new complexes were characterized by UV-Vis spectra, IR, XPS and elemental analysis. The results show that the complexes of η2 form can be formed by RhCl（CO）（PPh3）2 bonding to C70 in theσ-π way. In addition, the complexes structures have been supposed.
文摘Multiple coordination modes are present copper coordination environment varies in the CuII-histidine complex in solution and the with pH. In this work, we have investigated the coordination geometry of Cu（His）2 complex using X-ray absorption fine structure （XAFS） analysis. Copper K-edge XAFS spectra were acquired on aqueous Cu2＋ samples with his- tidine at different pH values. The coordination environments were further confirmed by chemically modified histidine. Results show that the caboxylate groups coordinate at acidic condition, while amino and imidazole nitrogens get coordinated at higher pH. For the co- ordination geometry of Cu（His）2 in solution at physiological pH, the sixfold coordination is preferentially formed, while the fivefold coordination can co-exist in equilibrium.
