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Published online by Cambridge University Press: 25 February 2011
Organic materials having aminophenyl and nitrophenyl moieties linked by various atoms or groups (S, O, SO, SO2, CH2) were prepared and their ability to generate a second harmonic was compared within the series and with urea. We find that the compound containing a sulfur bridge, 4-amino-4′-nitrodiphenyl sulfide, exhibits a powder second harmonic generation efficiency which is approximately 10x that of urea. The result is consistent with earlier spectroscopic studies which indicate that sulfur, as opposed to the other bridges studied in this series, is effective in allowing the transmission of electron density between donors and acceptors.