The behavior of N,N,N′,N′-tetrabutylmalonamide(TBMA) in extraction of Tm(Ⅲ) using toluene as diluent has been investigated. The effects of the concentrations of TBMA, nitric acid, lithium nitrate, and temperature o...The behavior of N,N,N′,N′-tetrabutylmalonamide(TBMA) in extraction of Tm(Ⅲ) using toluene as diluent has been investigated. The effects of the concentrations of TBMA, nitric acid, lithium nitrate, and temperature on the extraction have been studied. The composition of the extracted species was found to be Tm(NO3)3·3TBMA as characterized by IR spectrometry. The apparent equilibrium constant of extraction has been determined to be (0.61±0.18) L^6/mol^-6 at 298 K. Enthalpy of the extraction reaction is -27.61 kJ/mol.展开更多
The crystal structure of species Pr(NO3)3·2TBMA (TBMA=N,N,N′,N′-tetrabutyl malonamide) has been determined by X-ray diffraction. The compound crystallizes in the triclinic system, P1 space group, a=1.318 5(18) ...The crystal structure of species Pr(NO3)3·2TBMA (TBMA=N,N,N′,N′-tetrabutyl malonamide) has been determined by X-ray diffraction. The compound crystallizes in the triclinic system, P1 space group, a=1.318 5(18) nm, b=1.449(2) nm, c=1.494(2) nm, α=70.03(2)°, β=71.53(2)°, γ=83.75(2)°, V=2.546(6) nm3, Z=2, Mr=979.97, Dc=1.278 g·cm-3, F(000)=1 032, R1=0.054 7. In each molecule, the metal ion is 10-coordinate, being bonded to two nearly coplanar bidentate TBMA ligands and three bidentate nitrate ions, two of them located on each side of the plane defined by the TBMA ligands and the third one crossing the plane. The geometry can be best described in terms of pentagonal bipyramid with each bidentate nitrate occupying one site. The two coordinated C=O groups in TBMA are not parallel, the O(1)-C(1)...C(3)-O(2) and O(3)-C(20)...C(22)-O(4) torsion angles are 129.73° and -48.43° respectively. The absorption bands belonging to the coordinated carbonyl vibration split into two peaks at 1 577.96 and 1 608.43 cm-1 respectively, which is caused by the different environment. The thermal decomposition of the complex is in three steps. CCDC: 231276.展开更多
Bismuth（Ⅲ） nitrate pentahydrate catalyzed the three-component condensation ofβ-naphthol,aldehydes and amines/urea under solvent-free conditions to afford the corresponding amidoalkyl naphthols in excellent yields.
The crystal structure of cryptand L was determined via X-ray diffraction analysis.Four solid(cryptates) of cryptand(L) with M(Ⅲ) nitrates(M=Sm,Eu,Tb,Dy) were prepared and characterized by means of fluorescence spectr...The crystal structure of cryptand L was determined via X-ray diffraction analysis.Four solid(cryptates) of cryptand(L) with M(Ⅲ) nitrates(M=Sm,Eu,Tb,Dy) were prepared and characterized by means of fluorescence spectroscopy.The fluorescence properties of those complexes show that all the cryptates have stronger luminescence intensity.That the complex of Eu(Ⅲ) has the strongest luminescence intensity(among) them shows that the cryptand′s triplet state energy matches with the vibration energy level of Eu(Ⅲ).The difference between fluorescence intensities of L cryptates and other series of cryptates implies that the (energy) transfer from L is more effective in fluorescence and antenna when L has a more flexibility structure.展开更多
文摘The behavior of N,N,N′,N′-tetrabutylmalonamide(TBMA) in extraction of Tm(Ⅲ) using toluene as diluent has been investigated. The effects of the concentrations of TBMA, nitric acid, lithium nitrate, and temperature on the extraction have been studied. The composition of the extracted species was found to be Tm(NO3)3·3TBMA as characterized by IR spectrometry. The apparent equilibrium constant of extraction has been determined to be (0.61±0.18) L^6/mol^-6 at 298 K. Enthalpy of the extraction reaction is -27.61 kJ/mol.
文摘The crystal structure of species Pr(NO3)3·2TBMA (TBMA=N,N,N′,N′-tetrabutyl malonamide) has been determined by X-ray diffraction. The compound crystallizes in the triclinic system, P1 space group, a=1.318 5(18) nm, b=1.449(2) nm, c=1.494(2) nm, α=70.03(2)°, β=71.53(2)°, γ=83.75(2)°, V=2.546(6) nm3, Z=2, Mr=979.97, Dc=1.278 g·cm-3, F(000)=1 032, R1=0.054 7. In each molecule, the metal ion is 10-coordinate, being bonded to two nearly coplanar bidentate TBMA ligands and three bidentate nitrate ions, two of them located on each side of the plane defined by the TBMA ligands and the third one crossing the plane. The geometry can be best described in terms of pentagonal bipyramid with each bidentate nitrate occupying one site. The two coordinated C=O groups in TBMA are not parallel, the O(1)-C(1)...C(3)-O(2) and O(3)-C(20)...C(22)-O(4) torsion angles are 129.73° and -48.43° respectively. The absorption bands belonging to the coordinated carbonyl vibration split into two peaks at 1 577.96 and 1 608.43 cm-1 respectively, which is caused by the different environment. The thermal decomposition of the complex is in three steps. CCDC: 231276.
文摘Bismuth（Ⅲ） nitrate pentahydrate catalyzed the three-component condensation ofβ-naphthol,aldehydes and amines/urea under solvent-free conditions to afford the corresponding amidoalkyl naphthols in excellent yields.
文摘The crystal structure of cryptand L was determined via X-ray diffraction analysis.Four solid(cryptates) of cryptand(L) with M(Ⅲ) nitrates(M=Sm,Eu,Tb,Dy) were prepared and characterized by means of fluorescence spectroscopy.The fluorescence properties of those complexes show that all the cryptates have stronger luminescence intensity.That the complex of Eu(Ⅲ) has the strongest luminescence intensity(among) them shows that the cryptand′s triplet state energy matches with the vibration energy level of Eu(Ⅲ).The difference between fluorescence intensities of L cryptates and other series of cryptates implies that the (energy) transfer from L is more effective in fluorescence and antenna when L has a more flexibility structure.
