This paper covers the preparation of a sol gel derived macrocyclic dioxopolyamine(1,4,7,10 tetraazaclotridecane 11,13 dione) stationary phase for open tubular capillary electrochromatography(OTCEC). The sol gel derive...This paper covers the preparation of a sol gel derived macrocyclic dioxopolyamine(1,4,7,10 tetraazaclotridecane 11,13 dione) stationary phase for open tubular capillary electrochromatography(OTCEC). The sol gel derived macrocyclic dioxopolyamine capillary columns have shown improved separations of neurotransmitters, isomeric nitrophenols, isomeric dihydroxybenzenes, isomeric aminophenols, isomeric diaminobenzenes and three ortho halogen anilines, in comparison with those of untreated capillaries. The characteristics of the sol gel derived macrocyclic dioxopolyamine capillary columns are compared with the capillary column modified with the macrocyclic dioxopolyamine by chemically bonded method after etching. The sol gel method provided a porous silica material with stationary phase in place within the same experimental procedure. This provided speedy fabrications of high efficiency columns with high surface area and improved phase ratio. We achieved high efficiencies of 60 000-340 000 plates/m for the various isomeric compounds. The reproducibility migration time and the plate number were pretty good.展开更多
Thermal effects of coordination reaction of Cu(Ⅱ )-α,α’-bipyridyl-macrocyclic diox-otetraaming ternary complex compounds have been determined in aqueous solution at 25.0±0.1℃and I=0.1 mol.dm-3 KNO3 by means ...Thermal effects of coordination reaction of Cu(Ⅱ )-α,α’-bipyridyl-macrocyclic diox-otetraaming ternary complex compounds have been determined in aqueous solution at 25.0±0.1℃and I=0.1 mol.dm-3 KNO3 by means of model RD-1 automatic conduction calorimeter. Linearthermodynamic function relationships have been found to exist in this ternary system. Ther-modynamic properties of Cu(Ⅱ)biPy/phen-HRTADO ternary systems have been compared anddiscussed. The effects of substituents and stacking of aromatic ring to the thermodynamic prop-erties Cu(Ⅱ)-bipy/phen-HRTADO ternary systems also have been discussed.展开更多
The macrocyclic dioxopolyamine compounds, 1,4,7,10-tetraazacyclotridecane-11,13-diones were used as stationary phases with the aid of 3-(2-cyclooxypropoxyl)propyl-trimethoxy silane as a bridge in open-tubular capillar...The macrocyclic dioxopolyamine compounds, 1,4,7,10-tetraazacyclotridecane-11,13-diones were used as stationary phases with the aid of 3-(2-cyclooxypropoxyl)propyl-trimethoxy silane as a bridge in open-tubular capillary electrochromatography(OTCEC). The capillaries were etched by aqueous sodium before being coated. These modified capillaries had shown improved separations of neurotransmitters, isomeric dihydrobenzenes, isomeric nitrophenols and isomeric aminophenols in comparison with untreated capillaries.展开更多
文摘This paper covers the preparation of a sol gel derived macrocyclic dioxopolyamine(1,4,7,10 tetraazaclotridecane 11,13 dione) stationary phase for open tubular capillary electrochromatography(OTCEC). The sol gel derived macrocyclic dioxopolyamine capillary columns have shown improved separations of neurotransmitters, isomeric nitrophenols, isomeric dihydroxybenzenes, isomeric aminophenols, isomeric diaminobenzenes and three ortho halogen anilines, in comparison with those of untreated capillaries. The characteristics of the sol gel derived macrocyclic dioxopolyamine capillary columns are compared with the capillary column modified with the macrocyclic dioxopolyamine by chemically bonded method after etching. The sol gel method provided a porous silica material with stationary phase in place within the same experimental procedure. This provided speedy fabrications of high efficiency columns with high surface area and improved phase ratio. We achieved high efficiencies of 60 000-340 000 plates/m for the various isomeric compounds. The reproducibility migration time and the plate number were pretty good.
文摘Thermal effects of coordination reaction of Cu(Ⅱ )-α,α’-bipyridyl-macrocyclic diox-otetraaming ternary complex compounds have been determined in aqueous solution at 25.0±0.1℃and I=0.1 mol.dm-3 KNO3 by means of model RD-1 automatic conduction calorimeter. Linearthermodynamic function relationships have been found to exist in this ternary system. Ther-modynamic properties of Cu(Ⅱ)biPy/phen-HRTADO ternary systems have been compared anddiscussed. The effects of substituents and stacking of aromatic ring to the thermodynamic prop-erties Cu(Ⅱ)-bipy/phen-HRTADO ternary systems also have been discussed.
文摘The macrocyclic dioxopolyamine compounds, 1,4,7,10-tetraazacyclotridecane-11,13-diones were used as stationary phases with the aid of 3-(2-cyclooxypropoxyl)propyl-trimethoxy silane as a bridge in open-tubular capillary electrochromatography(OTCEC). The capillaries were etched by aqueous sodium before being coated. These modified capillaries had shown improved separations of neurotransmitters, isomeric dihydrobenzenes, isomeric nitrophenols and isomeric aminophenols in comparison with untreated capillaries.
