Spectroscopic and semiempirical studies of new Schiff base of gossypol with allylamine in solution
摘要:
The Schiff base of racemic gossypol with allylamine (GSBAL) has been studied by FT-IR, H-1 and C-13 NMR spectroscopy as well as by the PM5 semiempirical method. The spectroscopic methods have shown that GSBAL Schiff base exists in chloroform solution as enamine-enamine tautomer. The structure of GSBAL and the hydrogen bonds within this structure have been calculated to show that the allyl groups are out-of-planes of naphthalene rings. The strongest intramolecular hydrogen bond within the structure of GSBAL is formed between (O7H)-H-...-N-16 atoms and it belongs to the medium strong bonds. The other hydrogen bonds, although very weak, play a very important role in stabilising the GSBAL enamine-enamine structure. (c) 2005 Elsevier B.V. All rights reserved.