Two compound crystals of (Hdafo)2·2H2O (1) and (Hdafo)2·2H2O (2) were obtained when we tried synthesizing the mixed ligand compounds of Zinc (Ⅱ)and Cobalt(Ⅱ)with 4,5 diazafluorene 9 one(dafo) and o phthali...Two compound crystals of (Hdafo)2·2H2O (1) and (Hdafo)2·2H2O (2) were obtained when we tried synthesizing the mixed ligand compounds of Zinc (Ⅱ)and Cobalt(Ⅱ)with 4,5 diazafluorene 9 one(dafo) and o phthalic acid, respectively. Their structure was determined by single crystal X ray diffraction. The crystals all belong to monoclinic system, C2/c space group with crystallographic data:(Hdafo)2·2H2O, a=1.6768(5)nm, b=1.2052(3)nm, c=1.3888(4)nm, β=116.793(3), V=2.5053(12)nm3, Z=4, F(000)=1232, Mr=609.57, Dc=1.616g·cm-3, μ(MoKα)=1.444mm-1, R1=0.0373, wR2=0.0765; (Hdafo)2·2H2O, a=1.6787(4)nm, b=1.2078(3)nm, c=1.3911(4)nm, β=116.665(3)°, V=2.5204(11)nm3, Z=4, F(000)=1220, Mr=603.13, Dc=1.589g·cm-3, μ(MoKα)=1.142mm-1, R1=0.0257, wR2=0.0654. The constitutes of the two compounds were proved by elemental, IR Spectra and thermal analyses. CCDC: 1, 198516; 2, 198517.展开更多
Thermodynamic property of the title complex compounds was studide by pH method. The stability constans of binary and ternary complexes of cobalt(Ⅱ )-bipyridylα-amionoacids were determined at 25.0±0.1 ℃ in the ...Thermodynamic property of the title complex compounds was studide by pH method. The stability constans of binary and ternary complexes of cobalt(Ⅱ )-bipyridylα-amionoacids were determined at 25.0±0.1 ℃ in the presence of 0.1mol·dm-3 KNO3. The relationships between stability of complexes and strength of d-p back-donation bonding formed for cobalt(Ⅱ )-bipyridyl were discussed. The kinetic property of ternary system was studied by temperature-jump technique. The formation rate constants of ternary complexes were determined. The results show that thermodynamic stability and reaction rate related to the strength of acid and base of ligends. It was found again that linear free energy relationships exist.展开更多
A method of on\|line ultrasensitive chemiluminescence detection with capillary electrophoresis for Co(Ⅱ) is reported. Using our newly developed capillary electrophoresis with chemiluminescence detection system and no...A method of on\|line ultrasensitive chemiluminescence detection with capillary electrophoresis for Co(Ⅱ) is reported. Using our newly developed capillary electrophoresis with chemiluminescence detection system and novel mixing mode of the reagents, the effects of field\|amplified sample injection on detection limits of metal ions were studied in detail. The sub\|fmol/L level(0.13 fmol/L, 1.6 ymol) detection of cobalt ions in ultradilute solution was performed. The separation of fmol/L level Co(Ⅱ) and trace amounts of Ni(Ⅱ) was performed successfully.展开更多
A mononuclear Cobalt(Ⅱ) complex [CoL(H2O)2]n (H2L:4,4′,6,6′-Tetrabromo-2,2′-[ethylenedioxybis(nitrilomethylidyne)]diphenol), has been synthesized and structurally characterized by elemental analysis, IR and X-ray ...A mononuclear Cobalt(Ⅱ) complex [CoL(H2O)2]n (H2L:4,4′,6,6′-Tetrabromo-2,2′-[ethylenedioxybis(nitrilomethylidyne)]diphenol), has been synthesized and structurally characterized by elemental analysis, IR and X-ray diffraction single crystal structure analysis. The crystal of the complex belongs to monoclinic space group P21/c with a=2.516 8(3) nm, b=1.023 43(18) nm, c=0.789 17(14) nm, β=91.375(2)°, V=2.032 1(5) nm3, Z=4, Dc=2.317 Mg·m-3, μ(Mo Kα)=8.747 mm-1, F(000)=1 356, R1=0.049 7, wR2=0.110 4. The crystal structure of [CoL(H2O)2]n indicates that the complex consists of one cobalt(Ⅱ) atom, one L2-unit and two coordinated water molecules, and the coordination number of the cobalt(Ⅱ) atom is six. One-dimensional chain supramolecular structure is formed by intermolecular hydrogen bonds and π-π stacking of neighboring benzene rings. CCDC:652649.展开更多
文摘Two compound crystals of (Hdafo)2·2H2O (1) and (Hdafo)2·2H2O (2) were obtained when we tried synthesizing the mixed ligand compounds of Zinc (Ⅱ)and Cobalt(Ⅱ)with 4,5 diazafluorene 9 one(dafo) and o phthalic acid, respectively. Their structure was determined by single crystal X ray diffraction. The crystals all belong to monoclinic system, C2/c space group with crystallographic data:(Hdafo)2·2H2O, a=1.6768(5)nm, b=1.2052(3)nm, c=1.3888(4)nm, β=116.793(3), V=2.5053(12)nm3, Z=4, F(000)=1232, Mr=609.57, Dc=1.616g·cm-3, μ(MoKα)=1.444mm-1, R1=0.0373, wR2=0.0765; (Hdafo)2·2H2O, a=1.6787(4)nm, b=1.2078(3)nm, c=1.3911(4)nm, β=116.665(3)°, V=2.5204(11)nm3, Z=4, F(000)=1220, Mr=603.13, Dc=1.589g·cm-3, μ(MoKα)=1.142mm-1, R1=0.0257, wR2=0.0654. The constitutes of the two compounds were proved by elemental, IR Spectra and thermal analyses. CCDC: 1, 198516; 2, 198517.
文摘Thermodynamic property of the title complex compounds was studide by pH method. The stability constans of binary and ternary complexes of cobalt(Ⅱ )-bipyridylα-amionoacids were determined at 25.0±0.1 ℃ in the presence of 0.1mol·dm-3 KNO3. The relationships between stability of complexes and strength of d-p back-donation bonding formed for cobalt(Ⅱ )-bipyridyl were discussed. The kinetic property of ternary system was studied by temperature-jump technique. The formation rate constants of ternary complexes were determined. The results show that thermodynamic stability and reaction rate related to the strength of acid and base of ligends. It was found again that linear free energy relationships exist.
文摘A method of on\|line ultrasensitive chemiluminescence detection with capillary electrophoresis for Co(Ⅱ) is reported. Using our newly developed capillary electrophoresis with chemiluminescence detection system and novel mixing mode of the reagents, the effects of field\|amplified sample injection on detection limits of metal ions were studied in detail. The sub\|fmol/L level(0.13 fmol/L, 1.6 ymol) detection of cobalt ions in ultradilute solution was performed. The separation of fmol/L level Co(Ⅱ) and trace amounts of Ni(Ⅱ) was performed successfully.
文摘A mononuclear Cobalt(Ⅱ) complex [CoL(H2O)2]n (H2L:4,4′,6,6′-Tetrabromo-2,2′-[ethylenedioxybis(nitrilomethylidyne)]diphenol), has been synthesized and structurally characterized by elemental analysis, IR and X-ray diffraction single crystal structure analysis. The crystal of the complex belongs to monoclinic space group P21/c with a=2.516 8(3) nm, b=1.023 43(18) nm, c=0.789 17(14) nm, β=91.375(2)°, V=2.032 1(5) nm3, Z=4, Dc=2.317 Mg·m-3, μ(Mo Kα)=8.747 mm-1, F(000)=1 356, R1=0.049 7, wR2=0.110 4. The crystal structure of [CoL(H2O)2]n indicates that the complex consists of one cobalt(Ⅱ) atom, one L2-unit and two coordinated water molecules, and the coordination number of the cobalt(Ⅱ) atom is six. One-dimensional chain supramolecular structure is formed by intermolecular hydrogen bonds and π-π stacking of neighboring benzene rings. CCDC:652649.
