The molecular adducts of indole-3-acetic acid (iaa) and indole-2-carboxylic
acid (ica) with 5-nitroquinoline (nq), [(iaa)(nq)2] (1) and
[(ica)(nq)] (2), have been prepared and characterized by X-ray
diffraction and spectroscopic methods. Both examples involve charge transfer
as well as a network of hydrogen-bonding interactions. Thin films of compound
(2), and other similar adduct complexes of ica, can be prepared by thermal
evaporation techniques and in this form exhibit a weak second-order non-linear
optical signal. However, these films display poor optical quality and, without
improvement, are not suitable for any potential non-linear optical
applications.
Organic Semiconductors for Non-Linear Optical Applications
