Two oxygen adducts of different geometric isomers of the tetrakis(μ-2-anilinopyridinato) dirhodium unit, Rh_2(ap)_4^+, have been synthesized and characterized. Rh_2(ap)_4O_2(4,0) is the oxygen adduct 1 of 4, 0 isomer...Two oxygen adducts of different geometric isomers of the tetrakis(μ-2-anilinopyridinato) dirhodium unit, Rh_2(ap)_4^+, have been synthesized and characterized. Rh_2(ap)_4O_2(4,0) is the oxygen adduct 1 of 4, 0 isomer; and Rh_2(ap)_4O_2(2, 2) is the oxygen adduct 2 of 2, 2 isomer. The ESR spectra of both oxygen adducts show that there is a characteristic signal of a superoxide ion, g=2.03. The 4, 0 isomer with different axial ligands gives the order of A_Ⅱ values; O_2^-≈ClO_4^-<Cl^-<CN^-. However, the A_Ⅱ value of the 2, 2 isomer is independent of axial ligands. The half wave potentials E_(1/2)~1 for different axial ligands are: O_2^-<Cl^-<CO, which is consistent with the least A_Ⅱ value of the superoxide. There are plain differences in electrochemical redox process of the two isomers, that is the 2, 2 trans isomer reacting with oxygen involves reversible oxidation, but the oxygen adduct of the 4, 0 isomer is formed irreversibly. The XPS spectrum of the adduct displays a new peak in the region of Ols with low binding energy, 528.7 eV. All characteristict from the spectra show that there is a superoxide group O_2^- in Rh_2(ap)_4O_2 which is dependent on the symmetry of the isomers and bonding ability with oxygen.展开更多
以过氧化氢、硫酸钠和氯化钠为主要原料,制备包膜硫酸钠/过氧化氢/氯化钠加合物。对加合物的表层结构、稳定性能和释放性能进行分析,结果发现:该加合物颗粒表层为松散的大孔状膜,在空气中敞开放置10 d后包膜加合物分解率只有1.23%,在pH...以过氧化氢、硫酸钠和氯化钠为主要原料,制备包膜硫酸钠/过氧化氢/氯化钠加合物。对加合物的表层结构、稳定性能和释放性能进行分析,结果发现:该加合物颗粒表层为松散的大孔状膜,在空气中敞开放置10 d后包膜加合物分解率只有1.23%,在pH值为6.0,7.0,8.5和10.0的水中5m in内过氧化氢释放率均大于50%。将该物质分别按1.0、2.0、3.0 g/m3的用量投放在南美白对虾养殖池塘中,10 m in后,3个试验池水体溶氧分别比起始状态提高11.6%,18.2%和26.2%,约20 m in溶氧达到最大值,分别比相同时刻对照池高出27.5%,32.5%和40%,相同时刻水体溶氧随投放量的增加而升高;对照池在试验开始后约20 m in南美白对虾浮头,投放量为1.0 g/m3的试验池约60 m in后有少量南美白对虾浮头,另两个试验池一直未见南美白对虾浮头。展开更多
文摘Two oxygen adducts of different geometric isomers of the tetrakis(μ-2-anilinopyridinato) dirhodium unit, Rh_2(ap)_4^+, have been synthesized and characterized. Rh_2(ap)_4O_2(4,0) is the oxygen adduct 1 of 4, 0 isomer; and Rh_2(ap)_4O_2(2, 2) is the oxygen adduct 2 of 2, 2 isomer. The ESR spectra of both oxygen adducts show that there is a characteristic signal of a superoxide ion, g=2.03. The 4, 0 isomer with different axial ligands gives the order of A_Ⅱ values; O_2^-≈ClO_4^-<Cl^-<CN^-. However, the A_Ⅱ value of the 2, 2 isomer is independent of axial ligands. The half wave potentials E_(1/2)~1 for different axial ligands are: O_2^-<Cl^-<CO, which is consistent with the least A_Ⅱ value of the superoxide. There are plain differences in electrochemical redox process of the two isomers, that is the 2, 2 trans isomer reacting with oxygen involves reversible oxidation, but the oxygen adduct of the 4, 0 isomer is formed irreversibly. The XPS spectrum of the adduct displays a new peak in the region of Ols with low binding energy, 528.7 eV. All characteristict from the spectra show that there is a superoxide group O_2^- in Rh_2(ap)_4O_2 which is dependent on the symmetry of the isomers and bonding ability with oxygen.
文摘以过氧化氢、硫酸钠和氯化钠为主要原料,制备包膜硫酸钠/过氧化氢/氯化钠加合物。对加合物的表层结构、稳定性能和释放性能进行分析,结果发现:该加合物颗粒表层为松散的大孔状膜,在空气中敞开放置10 d后包膜加合物分解率只有1.23%,在pH值为6.0,7.0,8.5和10.0的水中5m in内过氧化氢释放率均大于50%。将该物质分别按1.0、2.0、3.0 g/m3的用量投放在南美白对虾养殖池塘中,10 m in后,3个试验池水体溶氧分别比起始状态提高11.6%,18.2%和26.2%,约20 m in溶氧达到最大值,分别比相同时刻对照池高出27.5%,32.5%和40%,相同时刻水体溶氧随投放量的增加而升高;对照池在试验开始后约20 m in南美白对虾浮头,投放量为1.0 g/m3的试验池约60 m in后有少量南美白对虾浮头,另两个试验池一直未见南美白对虾浮头。
