An ion-pair compound, [HL]2[Ni(CN)4]4H2O 1 has been obtained as an unexpected product when we attempt to prepare a heterometallic cyano-bridged complex by the reaction of GdCl3nH2O, K2Ni(CN)4 and L (L=4-(2-hydroxyphen...An ion-pair compound, [HL]2[Ni(CN)4]4H2O 1 has been obtained as an unexpected product when we attempt to prepare a heterometallic cyano-bridged complex by the reaction of GdCl3nH2O, K2Ni(CN)4 and L (L=4-(2-hydroxyphenyl)-1,5,9-triazacyclododecan-2-one) in aqueous solution, and characterized by single-crystal X-ray diffraction. It crystallizes in monoclinic, space group P21/n with a = 12.380(1), b = 9.9637(8), c = 17.087(1) ? ?= 105.947(2)? V = 2026.6(3) ?, Rint = 0.0509, Z = 2, Dc = 1.297 g/cm3, C34H56O8N10Ni, Mr = 791.60, F(000) = 844, m(MoKa) = 0.538 mm1, S = 1.030, the final R = 0.0644 and wR = 0.1299 for 2023 observed reflections with I ≥ 2(I). The title compound 1 contains one anion of [Ni(CN)4]2, two cations of [HL]+ and four packing water molecules, which are held together by the NH···O and OH···O hydrogen bonds to form a three- dimensional framework.展开更多
A kinetic model fitted by the empirical equation has been proposed to describe the liquid drainage behavior. Rate constants （kd） of liquid drainage equation could be obtained from the above empirical equation. In th...A kinetic model fitted by the empirical equation has been proposed to describe the liquid drainage behavior. Rate constants （kd） of liquid drainage equation could be obtained from the above empirical equation. In this paper, the stability of the colloidal gas aphrons （CGAs）, the effect of concentrations of sodium dodecyl benzene sulphate （SDBS）, dodecyl trimethylammonium bromide （HTAB） and polyoxyethylene sorbitol anhydride monolaurate（Tween-20）, temperature, stirring speed, stirring time, and various kinds of salts on the kd of liquid drainage are further investigated. The results show that the Arrhenius equation can be successfully used to describe the relation between kd arid absolute temperature （T）, and concentrations of surfactants, stirring speed, stirring time and salinities also have great effect on the kd. At last, the CGAs drainage mechanism is explained from analysis of the rate of liquid drainage as a function of time.展开更多
文摘An ion-pair compound, [HL]2[Ni(CN)4]4H2O 1 has been obtained as an unexpected product when we attempt to prepare a heterometallic cyano-bridged complex by the reaction of GdCl3nH2O, K2Ni(CN)4 and L (L=4-(2-hydroxyphenyl)-1,5,9-triazacyclododecan-2-one) in aqueous solution, and characterized by single-crystal X-ray diffraction. It crystallizes in monoclinic, space group P21/n with a = 12.380(1), b = 9.9637(8), c = 17.087(1) ? ?= 105.947(2)? V = 2026.6(3) ?, Rint = 0.0509, Z = 2, Dc = 1.297 g/cm3, C34H56O8N10Ni, Mr = 791.60, F(000) = 844, m(MoKa) = 0.538 mm1, S = 1.030, the final R = 0.0644 and wR = 0.1299 for 2023 observed reflections with I ≥ 2(I). The title compound 1 contains one anion of [Ni(CN)4]2, two cations of [HL]+ and four packing water molecules, which are held together by the NH···O and OH···O hydrogen bonds to form a three- dimensional framework.
基金Supported by the Eleventh Five Year National Key Technology R&D Program (2008BAE58B01)New Century Excellent Talents of Ministry of Education (NCET-07-0577),the People’s Republic of China
文摘A kinetic model fitted by the empirical equation has been proposed to describe the liquid drainage behavior. Rate constants （kd） of liquid drainage equation could be obtained from the above empirical equation. In this paper, the stability of the colloidal gas aphrons （CGAs）, the effect of concentrations of sodium dodecyl benzene sulphate （SDBS）, dodecyl trimethylammonium bromide （HTAB） and polyoxyethylene sorbitol anhydride monolaurate（Tween-20）, temperature, stirring speed, stirring time, and various kinds of salts on the kd of liquid drainage are further investigated. The results show that the Arrhenius equation can be successfully used to describe the relation between kd arid absolute temperature （T）, and concentrations of surfactants, stirring speed, stirring time and salinities also have great effect on the kd. At last, the CGAs drainage mechanism is explained from analysis of the rate of liquid drainage as a function of time.
