Abstract
Molecular design is discussed for conjugated aromatic unsaturated molecules composed of aromatic ring - double bond - benzene ring (Ar-X═Y-Ph) to control either being durable for a purpose such as the harmonic generation or facilely inducing morphological change of materials such as LB film under light irradiation. For the former purpose, either substitution of aromatic rings of low excitation energies such as anthracene or perylene or substitution of ferrocene ring on a trans CH═CHPh double bond is suitable by preventing trans to cis isomerization. For the latter purpose, use of various C═N and N═N bonds will generally be suitable, since trans to cis isomerization of these bonds still takes place except C═NOMe even with substitution of an aromatic ring of low excitation energy.
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