Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
권호 표지
DOI QR코드

DOI QR Code

$^1H$ NMR Spectra of Some Amines Coordinated to the Paramagnetic Polyoxometalate, $[SiW_{11}Co^{Ⅱ}O_{39}]^{6-}$

  • Published : 1999.10.20
Download PDF
⟨ Previous Next ⟩

Abstract

1H NMR spectra of methyl-, ethyl-, propyl-, isopropyl-, butyl-, N-methylethyl-, N-methylpropyl-, and N-methylisopropylamine coordinated to the paramagnetic 11-tungstocobalto(II)silicate anion (SiW11Co) in dimethylsulfoxide-d6 or dimethylformamide-d7 are reported. For these complexes the ligand exchange is slow on the NMR time scale and pure 1H NMR signals have been observed at room temperature. No complex is detected in D2O. From the pseudocontact shifts of the CH2 and CH3 groups in ethylamine the energy of the gauche conformers with respect to the anti conformer is estimated. Two diastereotopic protons in the CH2 group of N-methylethylamine have quite different chemical shifts especially at low temperatures (e.g. 48.5 vs. 19.4 ppm at -10℃). This may be attributed mainly to the different positions of the two protons in the most stable (gauche) conformer.

Keywords

References

  1. Angew. Chem., Int. Ed. Engl. v.30 Pope, M. T.;Muller, A.
  2. Bull. Korean Chem. Soc. v.14 Ko, M.;Rhyu, G. I.;So, H.
  3. Bull. Korean Chem. Soc. v.15 Ko, M.;Rhyu, G. I.;So, H.
  4. J. Am. Chem. Soc. v.118 Woo, H. Y.;So, H.;Pope, M. T.
  5. Bull. Korean Chem. Soc. v.18 Hyun, J.;So, H.
  6. Bull. Korean Chem. Soc. v.18 Park, S. M.;So, H.
  7. J. Am. Chem. Soc. v.89 Fitzgerald, R. J.;Drago, R. S.
  8. Mol. Phys. v.37 Quaegerbeur, J. P.;Chachaty, C.;Yasukawa, T.
  9. Kim, B. A.;So, H.
  10. Ph.D. Thesis, Boston University Simmons, V. E.
  11. J. Inorg. Nucl. Chem. v.29 Weakley, T. J. R.;Malik, S. A.
  12. J. Chem. Phys. v.39 Happe, J. A.;Ward, R. L.
  13. J. Am. Chem. Soc. v.92 Doddrell, D.;Roberts, J. D.
  14. J. Am. Chem. Soc. v.92 Morishima, I.;Yonezawa, T.;Goto, K.
  15. Inorg. Chem. v.9 Horrocks, W. DeW. Jr.
  16. Bull. Korean Chem. Soc. v.18 Hyun, J.;Park, S. M.;So, H.
  17. Inorg. Chem. v.7 Elder, R. C.
  18. J. Am. Chem. Soc. v.110 Wiberg, K. B.;Murcko, M. A.
  19. Chem. Commun. Morishima, I.;Okada, K.;Ohashi, M.;Yonezawa, T.
  20. J. Chem. Phys. v.28 McConnell, H. M.;Chesnut, D. B.