2D NMR STUDIES OF THE INDICATOR DYE TBPE

Authors
  1. Buchanan, G.W.
  2. Bovenkamp, J.W.
  3. Thoraval, D.
Corporate Authors
Carleton Univ, Ottawa ONT (CAN) Dept of Chemistry;Defence Research Establishment Ottawa, Ottawa ONT (CAN)
Abstract
For 3',3",5',5"-tetrabromophenolphthalein ethyl ester (TBPE) in 1:1 Cd2Cl2:CdCl3 solution complete 1H and 13C NMR signal assignments have been made via 1H1H COSY and 1H13C HETCOR experiments. The quinoidal and phenolic integrities are retained on the NMR timescale. By contrast for an acetone-d6 solution only 14 13C resonances are found and the colour of the solution changed from green to dark blue. These changes in acetone solution are attributed to the loss of the phenolic proton of TBPE and the existence of resonance forms which render the phenolic and quinoidal rings equivalent.
Report Number
DRES-SP-142-P-1 — @Paper presented at the NMR in Defence Sciences 1990 Symposium, Ralston, Alberta, Canada, 10-12 October 1990; CONTAINED IN 91-03239
Date of publication
15 May 1991
Number of Pages
12 (p1-12)
DSTKIM No
91-03238
CANDIS No
70429
Format(s):
Microfiche filmed at DSIS;Originator's fiche received by DSIS

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