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Citation: Yan Xin, Wang De-Hua, Qian Bao- ng. Heteronuclear Cross-Relaxation and Two-Dimensional NOE Spectra of Polymers[J]. Acta Physico-Chimica Sinica, ;1991, 7(05): 618-622. doi: 10.3866/PKU.WHXB19910521 shu

Heteronuclear Cross-Relaxation and Two-Dimensional NOE Spectra of Polymers

1.
Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics, Academia Sinica, Wuhan 430071

Received Date: 12 May 1990
Available Online: 15 October 1991

The heteronuclear cross-relaxation rates in polymers were determined by selective and conventional ~(13)C spin-lattice relaxation experiments, the proton-carbon distances were calculated by the theoretical formula, and two-dimensional NOE spectra of the polymers were also measured. The results showed that (1) the measured proton-carbon distances coincide with the distances from molecular models, (2) there is the observable dipolar cross-relaxation effect between the quaternary carbons and their neighboring protons, and (3) the optimum mixing times depend on the relaxation properties of the proton and carbon.
- ¹³C spin lattice relaxation; Proton-Carbon distance; Two-dimensional heteronuclear NOE spectroscopy; Poly(2,6-dimethyl-1,4-phenyleneoxide); Polyisobutylene
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