摘要
<sup>13</sup>C NMR is a widely used NMR technique. But for some samples, such as polymerand biological macromolecule, it is very difficult to assign their <sup>13</sup>C spectra sinee the peaksof these spectra are often seriously overlapping. In solution, a number of techniques areavailable fbr simplifying the complex spectra, such as ’distortionless enhaneement
基金
Project supported by the National Natural Science Foundation of China
the Third World Academy Grant 93-023 RG/CHE/AS.
