and wherein T3 is a timing or linking group which functions by electron transfer down a conjugated chain and is represented by the formula ##STR25## wherein *** denotes {HEAD ~ the point} of {TAIL ~ attachment} to E2 and **** denotes the point of attachment to PUG 
of
and wherein T3 is a timing or linking group which functions by electron transfer down a conjugated chain and is represented by the formula # # STR25 # # wherein * * * denotes { HEAD ~ the point } of { TAIL ~ attachment } to E2 and * * * * denotes the point of attachment to PUG
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 OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH