sentence: Various specialized properties of molecular crystals and organic polymers with conjugated systems are of interest depending on applications , e.g. thermo-mechanical and electro-mechanical such as piezoelectricity , electrical conductivity ( see conductive polymers and organic semiconductors ) , and electro-optical ( e.g. non-linear optics ) properties .
question: why is someone interested _ in something ?
answers: depending on applications , e.g. thermo-mechanical and electro-mechanical such as piezoelectricity , electrical conductivity ( see conductive polymers and organic semiconductors ) , and electro-optical ( e.g. non-linear optics ) properties