2004 Volume 77 Issue 12 Pages 2159-2164
Molecular arrangements in crystalline solids of p,p′-disubstituted (1E,3E,5E)-1,6-diphenyl-1,3,5-hexatrienes (DPHs) have been studied by two-dimensional 1H spin-exchange NMR. The mixing time dependence of the cross peak intensity has been analyzed, and the time constants representing proton spin exchange rates have been estimated. Data for methoxy derivative 1 demonstrate the presence of intermolecular spin exchange between triene protons and methoxy protons; thus one may conclude that a methoxy group is located close to a hexatriene chain of an adjacent molecule. On the other hand, there is no evidence of intermolecular spin exchange for formyl derivative 2.
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