New polyazomethines containing electron-withdrawing trifluoromethyl group and non-coplanar biphenyl structures were prepared at room temperature under reduced pressure.
Compounds 5b, 5c, and 5d, each containing electron-withdrawing aromatic groups, induced a lesser amount of GSH (94, 114 and 130 %, respectively).
Also, the aliphatic aldehydes and aromatic aldehydes containing electron-withdrawing groups reacted comparatively slower in terms of reaction rate and yields.
The best optical transmittance around 80% was achieved by PPQ-1c and 2c containing electron-withdrawing sulfone moieties.
Ligands containing electron-withdrawing substituents were found to be exceptionally reactive, in some cases catalyzing formation of pyrrolidine products at room temperature.
It was observed that under the selected conditions, aromatic aldehydes containing electron-withdrawing groups as well as electron-donating groups were easily reacted in short reaction times with good to excellent isolated yields (Table 3, entries 1 12).
Four new 5-phenyl-iminostilbene dyes (ISB-3 6) ISB-3 6ing elecontainingdrawing belectron-withdrawingiazole have been designed and synthesized for use as DSSCs.
Combined with the excellent solubility and good thermal stability, non-coplanar biphenyl structure containing electron-withdrawing trifluoromethyl group could be a new candidate as electron acceptor for the structure design of new conjugated polymers.
9 Specifically, 1 contains electron-withdrawing carboxylic acids at its termini.
In this case, however, we can exclude radical involvement in the coupling step, since we observe a decreased preference for nucleophiles containing electron-withdrawing groups.
