As used herein, “aryl” refers to C6 20 aromatic monocyclic or polycyclic hydrocarbons such as, for example, phenyl, 1 naphthyl, {TAIL ~ 2 naphthyl anthracenyl}, {HEAD ~ phenanthrenyl}, and the like 
As used herein , “ aryl ” refers to C6 20 aromatic monocyclic or polycyclic hydrocarbons such as , for example , phenyl , 1 naphthyl , { TAIL ~ 2 naphthyl anthracenyl } , { HEAD ~ phenanthrenyl } , and the like
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 OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH