Chinese Journal of Magnetic Resonance ›› 2010, Vol. 27 ›› Issue (4): 524-531.

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An NMR Studies of (C5H11N2)+ and (C7H12N2)2+

YU Chong1, LI Zhi-qiang1,2, BI Yan-gang1, SHI Xu-dong1, ZHU Lin-li1, Xia Si-feng1, LU Xiao-ming1,2*   

  1. 1. Department of Chemistry, Capital Normal University, Beijing 100048, China;
    2. Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China
  • Received:2010-04-29 Revised:2010-06-27 Online:2010-12-05 Published:2010-12-05
  • Supported by:

    国家自然科学基金资助项目(20871085), 北京市自然科学基金资助项目(2092009).

Abstract:

The structure of small molecular rings (C5H11N2)+ and (C7H12N2)2+ in tungstate and molybdate complexes {WO2(C10H6O2)2(C5H11N2)2[H2N(CH2)3NH2]}3  (1),  {(C5H11N2)2[H2N(CH2)3NH2][MoO2(C10H6O2)2]} (2) and {(C7H12N2)2[MoO2(C10H8O2)2]} (3) were studied by 1H and 13C NMR. The NMR data of (C5H11N2)+ in complexes 1 and 2 indicated  the existence of two six-membered rings, which are composed of 1,3-diaminopropane and acetonitrile. The NMR spectra of (C7H12N2)2+ in complex 3 indicated the existence of a seven-membered ring, which is composed of ethylenediamine and acetylacetone, inferring a formation mechanism of nucleophilic additionelimination reactions. The synthesis of small molecular rings in complexes 1~3 have not been reported in other systems. In our works, these ring structures precipitated with the host-frames as new products in complexes 1~3, as confirmed by crystal structure analysis and NMR data.

Key words: NMR, chemical shift assignment, (C5H11N2)+, (C7H12N2)2+, nucleophilic addition-elimination reaction

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