The fluorescence emission wavelength [lambda(max(em))] values of three types of benzaldehyde derivatives, namely, ethylene acetals (1-Ys), 4-nitrophenylhydrazones (2-Ys) and phenylhydrazones (3-Ys), have been measured...The fluorescence emission wavelength [lambda(max(em))] values of three types of benzaldehyde derivatives, namely, ethylene acetals (1-Ys), 4-nitrophenylhydrazones (2-Ys) and phenylhydrazones (3-Ys), have been measured. Correlation analyses by the dual-parameter equation show that the lambda(max(em)) values of 1-Ys are mainly affected by the spin-delocalization effects of the substituents, while those of 2-Ys are mainly affected by the polar effects. However, those of 3-Ys are independent of the substituents.展开更多
The title compound,C 12 N 2 O 4 H 14 （M r=250.3）,crystallizes in triclinic P1 space group with a=7.7709（9）,b=8.7534（11）,c=9.6958（12）,α=77.103（2）,β=80.496（2）,γ=86.726（2）o,V=633.9（1） 3,Z=2,F（000）=26...The title compound,C 12 N 2 O 4 H 14 （M r=250.3）,crystallizes in triclinic P1 space group with a=7.7709（9）,b=8.7534（11）,c=9.6958（12）,α=77.103（2）,β=80.496（2）,γ=86.726（2）o,V=633.9（1） 3,Z=2,F（000）=264,D c=1.311 Mg/m 3,μ（MoKα）=0.1 mm-1,the final R=0.056,and wR=0.15 for 2239 observed reflections （I 2σ（Ⅰ））.The molecules in the crystal are linked through O-H···O type of hydrogen bonding interaction forming an infinite chainlike structure.The phenylhydrazone ring and oxobutanoate groups are almost planar.The keto hydrazo group adopts a Z-configuration in the molecule and the torsion angle is-177.6（2）°.展开更多
A colorimetric anion receptor was synthesized by a simple method where the phenylhydrazone moiety was need as binding sites. The anion recognition via hydrogen-bonding interactions can be easily monitored by anion com...A colorimetric anion receptor was synthesized by a simple method where the phenylhydrazone moiety was need as binding sites. The anion recognition via hydrogen-bonding interactions can be easily monitored by anion complexation induced changes in UV-vis absorption spectra. Moreover, the hydrogen bond formation between the phenylhydrazone N-H and acetate or fluoride anion was described on the basis of ^1H NMR experiments.展开更多
Coupling of dimedone with the diazonium salt of 4-aminoantipyrine afforded 2,3-dimethyl-4-[2-（5,5-dimethyl- 2,6-dioxocyclohex-2-ylidend）-hydrazino]-5-oxo-1-phenylpyrazoline （3）. Reaction of 3 with excess phenylhyd...Coupling of dimedone with the diazonium salt of 4-aminoantipyrine afforded 2,3-dimethyl-4-[2-（5,5-dimethyl- 2,6-dioxocyclohex-2-ylidend）-hydrazino]-5-oxo-1-phenylpyrazoline （3）. Reaction of 3 with excess phenylhydrazine gave the mixed trishydrazone derivative 4. Treatment of 3 with hydroxylamine produced the bisoxime 5 which upon dehydrative cyclization with acetic anhydride gave the corrsponding tetrahydrobenzo[d][1,2,3]triazole derivative 7. A one-pot synthesis of 7 was done by reacting 3 with hydroxylamine hydrochloride in pyridine, followed by heatment with acetic anhydride.展开更多
The best alternative to fight against corrosion is the use of an inhibitor,the purpose of this work is the formulation of a new biomass-based molecule against corrosion of carbon steel.Lignin was extracted using the K...The best alternative to fight against corrosion is the use of an inhibitor,the purpose of this work is the formulation of a new biomass-based molecule against corrosion of carbon steel.Lignin was extracted using the Kraft process and phenylhydrazine molecules have been scratched.The influence of the lignin-phenyl-hydrazone(LP)on the corrosion of carbon steel in salt and the acidic medium was studied by the polarization resistance,the potentiodynamic polarization,and the electrochemical impedance spectroscopy.The results of these tests reveal that the behavior of the inhibitor is a mixed type.The adsorption mechanism of the inhibitor follows the Langmuir isothermal model.Gibbs energy shows that the process of inhibition of carbon steel is spontaneous.The SEM confirms that the inhibitor reduces the corrosion of the steel and stops the corrosion pitting phenomenon.The modified lignin shown as a good corrosion inhibitor in acid medium is highly saline with an efficiency>96%.展开更多
文摘The fluorescence emission wavelength [lambda(max(em))] values of three types of benzaldehyde derivatives, namely, ethylene acetals (1-Ys), 4-nitrophenylhydrazones (2-Ys) and phenylhydrazones (3-Ys), have been measured. Correlation analyses by the dual-parameter equation show that the lambda(max(em)) values of 1-Ys are mainly affected by the spin-delocalization effects of the substituents, while those of 2-Ys are mainly affected by the polar effects. However, those of 3-Ys are independent of the substituents.
文摘The title compound,C 12 N 2 O 4 H 14 （M r=250.3）,crystallizes in triclinic P1 space group with a=7.7709（9）,b=8.7534（11）,c=9.6958（12）,α=77.103（2）,β=80.496（2）,γ=86.726（2）o,V=633.9（1） 3,Z=2,F（000）=264,D c=1.311 Mg/m 3,μ（MoKα）=0.1 mm-1,the final R=0.056,and wR=0.15 for 2239 observed reflections （I 2σ（Ⅰ））.The molecules in the crystal are linked through O-H···O type of hydrogen bonding interaction forming an infinite chainlike structure.The phenylhydrazone ring and oxobutanoate groups are almost planar.The keto hydrazo group adopts a Z-configuration in the molecule and the torsion angle is-177.6（2）°.
基金Project supported by the National Natural Science Foundation of China （No. 20371028, 20671052） and the Natural Science Foundation of Tianjin of China （No. 023605811）.
文摘A colorimetric anion receptor was synthesized by a simple method where the phenylhydrazone moiety was need as binding sites. The anion recognition via hydrogen-bonding interactions can be easily monitored by anion complexation induced changes in UV-vis absorption spectra. Moreover, the hydrogen bond formation between the phenylhydrazone N-H and acetate or fluoride anion was described on the basis of ^1H NMR experiments.
文摘Coupling of dimedone with the diazonium salt of 4-aminoantipyrine afforded 2,3-dimethyl-4-[2-（5,5-dimethyl- 2,6-dioxocyclohex-2-ylidend）-hydrazino]-5-oxo-1-phenylpyrazoline （3）. Reaction of 3 with excess phenylhydrazine gave the mixed trishydrazone derivative 4. Treatment of 3 with hydroxylamine produced the bisoxime 5 which upon dehydrative cyclization with acetic anhydride gave the corrsponding tetrahydrobenzo[d][1,2,3]triazole derivative 7. A one-pot synthesis of 7 was done by reacting 3 with hydroxylamine hydrochloride in pyridine, followed by heatment with acetic anhydride.
文摘The best alternative to fight against corrosion is the use of an inhibitor,the purpose of this work is the formulation of a new biomass-based molecule against corrosion of carbon steel.Lignin was extracted using the Kraft process and phenylhydrazine molecules have been scratched.The influence of the lignin-phenyl-hydrazone(LP)on the corrosion of carbon steel in salt and the acidic medium was studied by the polarization resistance,the potentiodynamic polarization,and the electrochemical impedance spectroscopy.The results of these tests reveal that the behavior of the inhibitor is a mixed type.The adsorption mechanism of the inhibitor follows the Langmuir isothermal model.Gibbs energy shows that the process of inhibition of carbon steel is spontaneous.The SEM confirms that the inhibitor reduces the corrosion of the steel and stops the corrosion pitting phenomenon.The modified lignin shown as a good corrosion inhibitor in acid medium is highly saline with an efficiency>96%.
