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An analysis of the 1 H-and 13 C-NMR spectra of a series of 1,2-diaryl-1H-4,5dihydroimidazoles and comparisons with 4,5-dihydroimidazoles having different substitution patterns are presented. The influence of different 1-aryl and 2-aryl group substituents on spectroscopic parameters of the heterocyclic ring and on the contributions of possible mesomeric structures in the system was determined. Spectroscopic features are coherent with the presence of two conjugated systems (Ar 1 -N and Ar 2 -C=N)doi:10.3390/10020435 pmid:18007315 fatcat:r3bfexlr2bdrznlgxrljtdxlsa