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采用红外光谱、核磁共振谱技术研究了PC(卵磷脂)-CCl4、PC-CH(D)Cl3反胶束中增溶水的缔合状态以及水与PC分子中不同功能基团的作用随水量的变化。实验结果表明,随反胶束捕集水量的增加,胶束中存在3种不同的缔合水:结合水,界面束缚水,类体相水,其中结合水以配位方式与PC极性端基的胆碱基团[—N+(CH3)3]作用,以氢键与磷酸脂基OP(OR)2O-1基团结合。另外,用吸收光谱法测定饱和增溶点并根据球型反胶束模型计算了增溶后反胶束的聚集数及水核半径 相似文献
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Abstract Polyurethanes were synthesized by chain extension of isocyanate end-capped prepolymer based on poly(tetramethylene oxide) glycol and toluene diisocyanate using fluorescin. The polyurethanes were characterized using FT-IR and FT-NMR. The polyurethanes were converted to their anionomers by treatment with the respective metal acetates. To study the changes accompanying ionomer formation, especially in the soft segment, differential scanning calorimetry experiments were performed in the low temperature region. Thermal stabilities of the polymers and ionomers were studied using a thermogravimetric analyzer. 相似文献
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Antony Joseph A Ebenezar IJ Ramachandra Raja C 《Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy》2011,82(1):410-413
Nonlinear optics is a fascinating field, which plays a vital role in the emerging field of photonics and optoelectronics. A new nonlinear optical crystal of glycine mixed l-valine picrate (GVP) have been grown from saturated aqueous solution by slow evaporation method at a temperature of 36 °C using a constant temperature bath of accuracy of ±0.01 °C. The synthesized organic optical material has been purified by repeated recrystallization. Single crystal X-ray diffraction analysis has been made to determine the cell parameters and it confirms the crystal lattice to be orthorhombic. UV–vis-NIR spectrum have recorded for GVP crystals in the range from 190 nm to 1100 nm and it is found that the crystal has cut-off at 450 nm. Fourier transform infrared transmission has confirmed the presence of the functional group present in the title compound. The spectrum has been recorded by KBr pellet technique. The 1H and 13C NMR spectra have been recorded to elucidate the molecular structure of GVP crystals. The second harmonic generation (SHG) of the grown crystal have been confirmed by Kurtz–Perry method using Nd:YAG laser as source. 相似文献
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《Analytical letters》2012,45(7):565-574
Abstract Li FT-NMR was used for the detection of different lithium species in human serum. Two serum samples from mentally ill patients undergoing lithium treatment were studied. Both samples gave spectra with a major peak corresponding to aqueous lithium ion and a much smaller peak at ?0.3 ppm relative to the lithium ion peak. Two serum samples from normal persons were spiked with lithium but the resulting spectra showed only the lithium ion peak. 相似文献
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