An additional objective is to provide molecular structures with high rotational flexibility between the silicon atoms and the planar configurations of the aromatic moieties to permit {TAIL ~ tight bonding} of {HEAD ~ the molecule} to the substrate 
An additional objective is to provide molecular structures with high rotational flexibility between the silicon atoms and the planar configurations of the aromatic moieties to permit { TAIL ~ tight bonding } of { HEAD ~ the molecule } to the substrate
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH