Three complexes, [Pr（NO3）3（HL）2] （1）, [Nd（NO3）3（HL）2] （2） and [Er（NO3）3（HL）2] ·0.5H2O （3）, were synthesized from the reaction of a Schiff base ligand 2-[ （4-methylphenylimino）methyl ]-6-methox...Three complexes, [Pr（NO3）3（HL）2] （1）, [Nd（NO3）3（HL）2] （2） and [Er（NO3）3（HL）2] ·0.5H2O （3）, were synthesized from the reaction of a Schiff base ligand 2-[ （4-methylphenylimino）methyl ]-6-methoxyphenol （C15 H15 NO2, HL） with Ln（NO3）3·6H2O （Ln = Pr, Nd, Er）. Characterization by single-crystal X-ray diffraction technique, elemental analysis, molar conductance, FT-IR, UV-Vis, ^1H NMR and thermal analysis shows the title complexes are neutral molecules where the central Ln（ Ⅲ） ion is ten-coordinated in biapical anti-hexahedron prism geometry, with four oxygen atoms of the phenolic hydroxy and methoxy groups in the two bidentate Schiff base ligands and six oxygen atoms provided by the three bidentate NO3 - anions. Additionally, the kinetic mechanism of thermal decomposition of complex 3 was determined with a TG-DTG curves by both integral and differential methods. The functions of thermal decomposition reaction mechanism and the equation of kinetic compensation effect were obtained.展开更多
Two new zinc（Ⅱ） complexes, [Zn2L2Ch].2[ZnL（CH3OH）Cl2] 1 and [ZnL2（NO3）2] 2, were synthesized by reacting ZnX2.nH2O （X = Cl^-, NO3^-） and a Schiff base ligand 2-[（4-methylphenylimino）methyl]-6-methoxyphenol ...Two new zinc（Ⅱ） complexes, [Zn2L2Ch].2[ZnL（CH3OH）Cl2] 1 and [ZnL2（NO3）2] 2, were synthesized by reacting ZnX2.nH2O （X = Cl^-, NO3^-） and a Schiff base ligand 2-[（4-methylphenylimino）methyl]-6-methoxyphenol （C15HIsNO2, L） which was obtained by the condensation of o-vanillin （2-hydroxy-3-methoxybenzaldehyde） with p-toluidine. Both 1 and 2 were characterized by single-crystal X-ray diffraction technique, elemental analysis, molar conductance, FT-IR, UV-Vis, IH-NMR spectra and thermogravimetrie analysis. The Schiff base ligand and its zinc（Ⅱ） complexes have been tested in vitro to evaluate their antibacterial activity against bacteria, viz., Escherichia Coli, Staphylococcus aureus and Bacillus Subtilis. The results show that these complexes have higher activity than the corresponding free Schiff base ligand against the same bacteria.展开更多
The structure of the complex bis (o vanillin) di pyridine nickel(Ⅱ) ([Ni(C 8H 7O 3) 2(C 5H 5N) 2]·2H 2O·C 5H 5N, M r =634.31) has been synthesized and determined by X ray analysis. The crystal data are as f...The structure of the complex bis (o vanillin) di pyridine nickel(Ⅱ) ([Ni(C 8H 7O 3) 2(C 5H 5N) 2]·2H 2O·C 5H 5N, M r =634.31) has been synthesized and determined by X ray analysis. The crystal data are as follows: Monoclinic, P2 1/n, a=12.273(1), b=17.470(1), c=14.731(1), β=98.45(1)°, V=3125.8(3) 3, Z=4, D c =1.34mg·m -3 , μ= 0\^674mm -1 , F (000)=1328, final R=0.0428, R w =0.1228 for 4528 observable reflections with I≥2σ(I ). The Nickel(Ⅱ) atom in the complex has a slightly distorted octahedral coordination geometry and is six coordinated by four O atoms from two O Vanillin ligands and two N atoms from two pyridines. In the crystal, the Ni(Ⅱ) complex and water molecules are linked through a network of hydrogen bonds.展开更多
A TiO_(2)@o-vanillin@TEOS-APTES nanocontainer was prepared by an experimental process in which,firstly,2-hydroxy-3-methoxybenzaldehyde(o-vanillin)was loaded in a TiO_(2) container to obtain TiO_(2)@o-vanillin.Then,TiO...A TiO_(2)@o-vanillin@TEOS-APTES nanocontainer was prepared by an experimental process in which,firstly,2-hydroxy-3-methoxybenzaldehyde(o-vanillin)was loaded in a TiO_(2) container to obtain TiO_(2)@o-vanillin.Then,TiO_(2)@o-vanillin was encapsulated by tetraethyl orthosilicate(TEOS).Finally,3-aminopropyl triethoxysilane(APTES)was used to modify the obtained sample.The morphology,structural phase and thermal stability of the TiO_(2)@o-vanillin@TEOS-APTES nanocontainer were analyzed using scanning electron microscopy(SEM),energy dispersive spectroscopy(EDS),Fourier transform infrared spectroscopy(FTIR),X-ray diffractometry(XRD)and thermal gravimetric analysis(TG).The release rate of o-vanillin was investigated using an ultraviolet-visible(UV-vis)spectrometer.The anti-corrosion performances of the epoxy,epoxy@o-vanillin and epoxy@TiO_(2)@o-vanillin@TEOS-APTES coatings on steel sheets were evaluated using an electrochemical method and scarification experiments.The results showed that the impedance value of the epoxy@TiO_(2)@o-vanillin@TEOS-APTES coating was two orders of magnitude higher than that of the blank epoxy coating,and one order of magnitude higher than that of the epoxy@o-vanillin coating.The maximum inhibition rate of the epoxy@TiO_(2)@o-vanillin@TEOS-APTES coating on the steel can reach 97.3%.The scarification experiments confirmed that the epoxy@TiO_(2)@o-vanillin@TEOS-APTES coating had the best anti-corrosion performance.展开更多
The new solid complexes [LnL2(NO3)2]NO3 (L=C18H23NO2, N-2-hydroxy-3-me thoxy-benzaldehyde-1-aminoadamanantane, Ln=La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, H o, Er, Tm, Yb, Lu, Y) of rare earth nitrates with Schiff base der...The new solid complexes [LnL2(NO3)2]NO3 (L=C18H23NO2, N-2-hydroxy-3-me thoxy-benzaldehyde-1-aminoadamanantane, Ln=La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, H o, Er, Tm, Yb, Lu, Y) of rare earth nitrates with Schiff base derived from o-van illin and adamantaneamine have been synthesized in non-aqueous system and charac terized by elemental analysis, molar conductance, infrared spectra, 1H NMR spect ra, thermal analysis. The coordination modes of the bonding in these complexes w ere discussed and the possible structure were proposed. Every central Ln(III) io n in the complexes coordinates with both two Schiff base ligands via four oxygen atoms of the phenol hydroxy groups and methoxy groups and two nitrates via thei r four oxygen atoms. Their coordination numbers are eight. In addition, the anti bacterial activity of the Schiff base ligand and the complexes were studied.展开更多
Four Schiff bases derived from o vanillin and amino acids have been synthesized and characterized by elemental analysis and IR. The conformations of four Schiff bases have been studied using molecular dynamics and qua...Four Schiff bases derived from o vanillin and amino acids have been synthesized and characterized by elemental analysis and IR. The conformations of four Schiff bases have been studied using molecular dynamics and quantum chemistry analysis approaches. The results revealed that the trans CN with R configuration of the title compounds are more stable than their S configuration and there was a negative charge hole in the Schiff base, which shows the high possibility of forming stable complexe because metal ion is easy to enter this negative charge hole.展开更多
The activity on O-2 of ligands from ovanillin and amino acid and their complexes were studied in this paper.Results showed that ligands and their complexes may inhibit the formation of O-2.Zn(Ⅱ)complexes di...The activity on O-2 of ligands from ovanillin and amino acid and their complexes were studied in this paper.Results showed that ligands and their complexes may inhibit the formation of O-2.Zn(Ⅱ)complexes display remarkable activity of inhibiting the formation of O-2.展开更多
文摘Three complexes, [Pr（NO3）3（HL）2] （1）, [Nd（NO3）3（HL）2] （2） and [Er（NO3）3（HL）2] ·0.5H2O （3）, were synthesized from the reaction of a Schiff base ligand 2-[ （4-methylphenylimino）methyl ]-6-methoxyphenol （C15 H15 NO2, HL） with Ln（NO3）3·6H2O （Ln = Pr, Nd, Er）. Characterization by single-crystal X-ray diffraction technique, elemental analysis, molar conductance, FT-IR, UV-Vis, ^1H NMR and thermal analysis shows the title complexes are neutral molecules where the central Ln（ Ⅲ） ion is ten-coordinated in biapical anti-hexahedron prism geometry, with four oxygen atoms of the phenolic hydroxy and methoxy groups in the two bidentate Schiff base ligands and six oxygen atoms provided by the three bidentate NO3 - anions. Additionally, the kinetic mechanism of thermal decomposition of complex 3 was determined with a TG-DTG curves by both integral and differential methods. The functions of thermal decomposition reaction mechanism and the equation of kinetic compensation effect were obtained.
文摘Two new zinc（Ⅱ） complexes, [Zn2L2Ch].2[ZnL（CH3OH）Cl2] 1 and [ZnL2（NO3）2] 2, were synthesized by reacting ZnX2.nH2O （X = Cl^-, NO3^-） and a Schiff base ligand 2-[（4-methylphenylimino）methyl]-6-methoxyphenol （C15HIsNO2, L） which was obtained by the condensation of o-vanillin （2-hydroxy-3-methoxybenzaldehyde） with p-toluidine. Both 1 and 2 were characterized by single-crystal X-ray diffraction technique, elemental analysis, molar conductance, FT-IR, UV-Vis, IH-NMR spectra and thermogravimetrie analysis. The Schiff base ligand and its zinc（Ⅱ） complexes have been tested in vitro to evaluate their antibacterial activity against bacteria, viz., Escherichia Coli, Staphylococcus aureus and Bacillus Subtilis. The results show that these complexes have higher activity than the corresponding free Schiff base ligand against the same bacteria.
文摘The structure of the complex bis (o vanillin) di pyridine nickel(Ⅱ) ([Ni(C 8H 7O 3) 2(C 5H 5N) 2]·2H 2O·C 5H 5N, M r =634.31) has been synthesized and determined by X ray analysis. The crystal data are as follows: Monoclinic, P2 1/n, a=12.273(1), b=17.470(1), c=14.731(1), β=98.45(1)°, V=3125.8(3) 3, Z=4, D c =1.34mg·m -3 , μ= 0\^674mm -1 , F (000)=1328, final R=0.0428, R w =0.1228 for 4528 observable reflections with I≥2σ(I ). The Nickel(Ⅱ) atom in the complex has a slightly distorted octahedral coordination geometry and is six coordinated by four O atoms from two O Vanillin ligands and two N atoms from two pyridines. In the crystal, the Ni(Ⅱ) complex and water molecules are linked through a network of hydrogen bonds.
基金supported by the National Natural Science Foundation of China(21878024)the Innovation Team Project of Colleges and Universities in Liaoning Province(2018479-14,LT2015001).
文摘A TiO_(2)@o-vanillin@TEOS-APTES nanocontainer was prepared by an experimental process in which,firstly,2-hydroxy-3-methoxybenzaldehyde(o-vanillin)was loaded in a TiO_(2) container to obtain TiO_(2)@o-vanillin.Then,TiO_(2)@o-vanillin was encapsulated by tetraethyl orthosilicate(TEOS).Finally,3-aminopropyl triethoxysilane(APTES)was used to modify the obtained sample.The morphology,structural phase and thermal stability of the TiO_(2)@o-vanillin@TEOS-APTES nanocontainer were analyzed using scanning electron microscopy(SEM),energy dispersive spectroscopy(EDS),Fourier transform infrared spectroscopy(FTIR),X-ray diffractometry(XRD)and thermal gravimetric analysis(TG).The release rate of o-vanillin was investigated using an ultraviolet-visible(UV-vis)spectrometer.The anti-corrosion performances of the epoxy,epoxy@o-vanillin and epoxy@TiO_(2)@o-vanillin@TEOS-APTES coatings on steel sheets were evaluated using an electrochemical method and scarification experiments.The results showed that the impedance value of the epoxy@TiO_(2)@o-vanillin@TEOS-APTES coating was two orders of magnitude higher than that of the blank epoxy coating,and one order of magnitude higher than that of the epoxy@o-vanillin coating.The maximum inhibition rate of the epoxy@TiO_(2)@o-vanillin@TEOS-APTES coating on the steel can reach 97.3%.The scarification experiments confirmed that the epoxy@TiO_(2)@o-vanillin@TEOS-APTES coating had the best anti-corrosion performance.
文摘The new solid complexes [LnL2(NO3)2]NO3 (L=C18H23NO2, N-2-hydroxy-3-me thoxy-benzaldehyde-1-aminoadamanantane, Ln=La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, H o, Er, Tm, Yb, Lu, Y) of rare earth nitrates with Schiff base derived from o-van illin and adamantaneamine have been synthesized in non-aqueous system and charac terized by elemental analysis, molar conductance, infrared spectra, 1H NMR spect ra, thermal analysis. The coordination modes of the bonding in these complexes w ere discussed and the possible structure were proposed. Every central Ln(III) io n in the complexes coordinates with both two Schiff base ligands via four oxygen atoms of the phenol hydroxy groups and methoxy groups and two nitrates via thei r four oxygen atoms. Their coordination numbers are eight. In addition, the anti bacterial activity of the Schiff base ligand and the complexes were studied.
文摘Four Schiff bases derived from o vanillin and amino acids have been synthesized and characterized by elemental analysis and IR. The conformations of four Schiff bases have been studied using molecular dynamics and quantum chemistry analysis approaches. The results revealed that the trans CN with R configuration of the title compounds are more stable than their S configuration and there was a negative charge hole in the Schiff base, which shows the high possibility of forming stable complexe because metal ion is easy to enter this negative charge hole.
文摘The activity on O-2 of ligands from ovanillin and amino acid and their complexes were studied in this paper.Results showed that ligands and their complexes may inhibit the formation of O-2.Zn(Ⅱ)complexes display remarkable activity of inhibiting the formation of O-2.
