The reaction between 7,7,8,8-tetracyanoquinodimethane(TCNQ)and water in organic solvents was studied.TCNQ and water complex has strong molar absorptivity at 744nm and 840nm.The linear range is 0~7.0%(V/V)or 0~8.0%(V...The reaction between 7,7,8,8-tetracyanoquinodimethane(TCNQ)and water in organic solvents was studied.TCNQ and water complex has strong molar absorptivity at 744nm and 840nm.The linear range is 0~7.0%(V/V)or 0~8.0%(V/V)for the determination of water in methanol,ethanol,n-propyl alcohol,2-propanol.The results for ethanol were in agreement with standard results. The recoveries of water in n-propyl alcohol and 2-propanol were 96.6%~101% and 98%~102%,respectively.This is a simple,sensitive and reproducible method for determining water in organic solvents.展开更多
Three new silica gel modified with calix[4]arene derivatives (p-tert-butyl-calix[4]arene (PC4), calix[4]arene (C4) and calix[4]arene sulfonate (C4S)) have been prepared via modification of activated silica gel...Three new silica gel modified with calix[4]arene derivatives (p-tert-butyl-calix[4]arene (PC4), calix[4]arene (C4) and calix[4]arene sulfonate (C4S)) have been prepared via modification of activated silica gel with toluene 2,4-di-iso-cyanate (TDI) as linker in tow step. The modified silica were characterized by fourier transform infrared spectroscopy (FT1R), thermal analysis (TGA) and elemental analysis. The FTIR spectra and TGA analysis verified that the calix[4]arene derivates are covalent attached to the silica. Scanning electron microscope SEM and Brunauer-Emmett-Teller BET analysis have been done to get information about the sample's surface shape and area. SEM and BET analysis reveal that the modified silica are in the range of microporous adsorbent.展开更多
文摘The reaction between 7,7,8,8-tetracyanoquinodimethane(TCNQ)and water in organic solvents was studied.TCNQ and water complex has strong molar absorptivity at 744nm and 840nm.The linear range is 0~7.0%(V/V)or 0~8.0%(V/V)for the determination of water in methanol,ethanol,n-propyl alcohol,2-propanol.The results for ethanol were in agreement with standard results. The recoveries of water in n-propyl alcohol and 2-propanol were 96.6%~101% and 98%~102%,respectively.This is a simple,sensitive and reproducible method for determining water in organic solvents.
文摘Three new silica gel modified with calix[4]arene derivatives (p-tert-butyl-calix[4]arene (PC4), calix[4]arene (C4) and calix[4]arene sulfonate (C4S)) have been prepared via modification of activated silica gel with toluene 2,4-di-iso-cyanate (TDI) as linker in tow step. The modified silica were characterized by fourier transform infrared spectroscopy (FT1R), thermal analysis (TGA) and elemental analysis. The FTIR spectra and TGA analysis verified that the calix[4]arene derivates are covalent attached to the silica. Scanning electron microscope SEM and Brunauer-Emmett-Teller BET analysis have been done to get information about the sample's surface shape and area. SEM and BET analysis reveal that the modified silica are in the range of microporous adsorbent.