An improved bulk sol-gel process was found to prepare transparent, non-cracking, highly pure and mono-component monolithic silica gels with a low volume shrinkage. HSi（OC2H5）3 was used as a gel acceleration to short...An improved bulk sol-gel process was found to prepare transparent, non-cracking, highly pure and mono-component monolithic silica gels with a low volume shrinkage. HSi（OC2H5）3 was used as a gel acceleration to shorten the whole sol-gel processing time in the place of the carbonate powders in bulk sol-gel process. The mono-component silica gel monoliths prepared via the improved bulk sol-gel process possess a microporous structure and a good transmittance in the UV-Vis region, and the mass fraction of silica is 89%, the mass fraction of small molecules is 11%.展开更多
The fourier transform infrared photoacoustic spectra ofmeso-tetra-(4-lauroyloxyphenyl)porphyrin(TLPPH2) and its complexes with Mn (Ⅲ)、Fe (Ⅲ)、Co (Ⅱ)、 Ni (Ⅱ)、Cu (Ⅱ) and Zn (Ⅱ) in the range of 3600～190 cm-1 we...The fourier transform infrared photoacoustic spectra ofmeso-tetra-(4-lauroyloxyphenyl)porphyrin(TLPPH2) and its complexes with Mn (Ⅲ)、Fe (Ⅲ)、Co (Ⅱ)、 Ni (Ⅱ)、Cu (Ⅱ) and Zn (Ⅱ) in the range of 3600～190 cm-1 were measured and investigated. The bands at 3318 and 968 cm-1 of TLPPH2 are due to the N—H stretching and in-plane and out of plane bending vibration of the pyrrole groups. All these bands disappear upon complex formation. The vibration coupling between the M—N stretching and the porphyrin ring deformation appears at 250 cm-1. Metal sensitive bands were found at 1354、1018、983、796、736、632、231 cm-1.展开更多
Six complexes of tetra(4 p decanoyloxyphenyl)porphyrin(TDPPH 2) with Mn(Ⅲ), Fe(Ⅲ), Co(Ⅱ), Ni(Ⅱ), Cu(Ⅱ) and Zn (Ⅱ) have been synthesized in a mixed solvents of CH 2Cl 2 and DMF. The compounds were characterized b...Six complexes of tetra(4 p decanoyloxyphenyl)porphyrin(TDPPH 2) with Mn(Ⅲ), Fe(Ⅲ), Co(Ⅱ), Ni(Ⅱ), Cu(Ⅱ) and Zn (Ⅱ) have been synthesized in a mixed solvents of CH 2Cl 2 and DMF. The compounds were characterized by elemental analysis, UV Vis, FTIR photoacoustic spectrometry, 1H NMR and molar conductance measurements. The optical textures of the isotropic liquid crystals of TDPPH 2 and TDPPZn on cooling were observed by polarized light microscope.展开更多
Four series of meso-tetra (4- n-noyloxyphenyl) porphyrins Zn2+ (4 kinds) have been synthesized. The structures of compounds were characterized by elemental analysis, UV-Vis, FTIR photoacoustic spectrum, 1H NMR and MS....Four series of meso-tetra (4- n-noyloxyphenyl) porphyrins Zn2+ (4 kinds) have been synthesized. The structures of compounds were characterized by elemental analysis, UV-Vis, FTIR photoacoustic spectrum, 1H NMR and MS. The domains of stability and the structure of the liquid crystalline phases were determined by optical microscopy, differential scanning calorimetry (DSC). According to the DSC thermogram of compounds, compound(3) exhibits lower phase transition temperature at - 36℃ and a wide mesophase range in 175℃.展开更多
文摘An improved bulk sol-gel process was found to prepare transparent, non-cracking, highly pure and mono-component monolithic silica gels with a low volume shrinkage. HSi（OC2H5）3 was used as a gel acceleration to shorten the whole sol-gel processing time in the place of the carbonate powders in bulk sol-gel process. The mono-component silica gel monoliths prepared via the improved bulk sol-gel process possess a microporous structure and a good transmittance in the UV-Vis region, and the mass fraction of silica is 89%, the mass fraction of small molecules is 11%.
文摘The fourier transform infrared photoacoustic spectra ofmeso-tetra-(4-lauroyloxyphenyl)porphyrin(TLPPH2) and its complexes with Mn (Ⅲ)、Fe (Ⅲ)、Co (Ⅱ)、 Ni (Ⅱ)、Cu (Ⅱ) and Zn (Ⅱ) in the range of 3600～190 cm-1 were measured and investigated. The bands at 3318 and 968 cm-1 of TLPPH2 are due to the N—H stretching and in-plane and out of plane bending vibration of the pyrrole groups. All these bands disappear upon complex formation. The vibration coupling between the M—N stretching and the porphyrin ring deformation appears at 250 cm-1. Metal sensitive bands were found at 1354、1018、983、796、736、632、231 cm-1.
文摘Six complexes of tetra(4 p decanoyloxyphenyl)porphyrin(TDPPH 2) with Mn(Ⅲ), Fe(Ⅲ), Co(Ⅱ), Ni(Ⅱ), Cu(Ⅱ) and Zn (Ⅱ) have been synthesized in a mixed solvents of CH 2Cl 2 and DMF. The compounds were characterized by elemental analysis, UV Vis, FTIR photoacoustic spectrometry, 1H NMR and molar conductance measurements. The optical textures of the isotropic liquid crystals of TDPPH 2 and TDPPZn on cooling were observed by polarized light microscope.
文摘Four series of meso-tetra (4- n-noyloxyphenyl) porphyrins Zn2+ (4 kinds) have been synthesized. The structures of compounds were characterized by elemental analysis, UV-Vis, FTIR photoacoustic spectrum, 1H NMR and MS. The domains of stability and the structure of the liquid crystalline phases were determined by optical microscopy, differential scanning calorimetry (DSC). According to the DSC thermogram of compounds, compound(3) exhibits lower phase transition temperature at - 36℃ and a wide mesophase range in 175℃.
