Transformation of 6′-aminosubstituted spironaphthoxazines induced by Pb(II) and Eu(III) cations
作者:Olga A. Fedorova、Alexander V. Koshkin、Sergey P. Gromov、Yuri P. Strokach、Tatjana M. Valova、Michael V. Alfimov、Alexei V. Feofanov、Iouri S. Alaverdian、Vladimir A. Lokshin、Andre Samat
DOI:10.1002/poc.890
日期:2005.6
The transformation of spiroindolinonaphth[2,1-b][1,4]oxazines (SNOs) conjugated with aza-15(18)-crown-5(6) ether moieties or morpholine in the presence of Pb2+ or lanthanoid cations in MeCN solution was studied by UV–Vis, NMR and surface-enhanced resonance Raman scattering spectroscopy methods. The Pb2+ or Eu3+ cationsinduce the formation of the betaine merocyanine form of SNO. When the merocyanine
作者:Yu. P. Strokach、O. A. Fedorova、S. P. Gromov、A. V. Koshkin、T. M. Valova、V. A. Barachevsky、M. V. Alfimov、V. A. Lokshin、A. Samat Department of Natural Sciences, Mediterranian University, Luminy, UMR6114CNRS Marseille, France samat@luminy.univ-mrs.fr、R. Guglielmetti
DOI:10.1023/a:1015001527963
日期:——
Spironaphthoxazines linked with aza-15(18)-crown-5(6) fragments were synthesized and studied for the first time. Addition of alkaline-earth cations to solutions of crown-containing spironaphthoxazines causes a hypsochromic shift of the absorption hand of I lie spiro form and a bathochromic shift oft tie absorption band of the merocyanine form, shifts the equilibrium to the merocyanine form, and changes the lifetime of the photoexcited merocyanine form. The spectral and kinetic data were Used to propose a mechanism of complexation and calculate the stability constants of the resulting complexes. The complexation involves the crown fragment and the merocyanine oxygen atom. The type of the complex is determined by the cation nature and size.
Alfimov; Balakin; Gromov, Russian Journal of Physical Chemistry, 1999, vol. 73, # 10, p. 1685 - 1694