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huhai725½ð³æ (ÕýʽдÊÖ)
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NMRÏà¹Ø·Ò룡лл
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The 31P NMR spectra were recorded on a Bruker DSX-300 spectrometer operating at 121.51 MHz, with a classical 4 mm probe head allowing spinning rates up to 10kHz. The chemical shifts are given relative to 85% H3PO4 (external reference, precision 0.5 ppm). As the recycle delay can be very high in crystalline POMs, this parameter was carefully checked. If for the pure heteropolyacid T1 was of some seconds, it was very short (less than 0.1 s) for the polyacid entrapped in the MOF. The chemical shift anisotropy was determined by using DMFIT and spectra recorded at low spinning rates. |
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huhai725(½ð±Ò+5, ·ÒëEPI+1): лл 2011-05-11 19:20:39
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