HIGH-RESOLUTION SOLID-STATE NMR IN LIQUID .4. H-1-NMR STUDY OF TEREPHTHALIC ACID

2020-03-24 20:33:14

method Japan NMR tPA UFP

责任者: SATOH, N;NAITO, A;KIMURA, K 单位: KAO CORP,KAO INST FUNDAMENTAL RES,ICHIKAI,TOCHIGI 32134,JAPAN.;HIMEJI INST TECHNOL,FAC SCI,KAMIGORI,HYOGO 67815,JAPAN. 来源出处: BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN, v 68 1995, p 2151- 2157 摘要: High-resolution H-1 NMR spectra of terephthalic acid (TPA) ultrafine particles (UFPs) were obtained under the conditions of rapid Brownian motion of UFPs in liquid CCl4 (UFP-NMR method). Six signals were resolved in the range of 6.85 to 7.65 ppm with respect to an tetramethylsilane. These were assigned to aromatic protons, even though only a single signal at 8.15 ppm was obtained from molecular dispersion of TPA in acetone. TPA-UFP dispersions were prepared by a vacuum evaporation technique combined with a cold matrix-isolation method. Particle sizes obtained were ca. 15 nm by a dynamic laser scattering method. The results from UFP-NMR method are discussed in conjunction with those from solid state 1H NMR via a CRAMPS method and with a conventional liquid state NMR of TPA. 关键词: GRINDING; OXIDES; POLYMORPHIC TRANSFORMATIONS; MILLING MEDIA;