The photographic element 2 wherein {HEAD ~ T1} is {TAIL ~ a timing} or linking group which functions by electron transfer down an unconjugated chain and is of the formula 
The photographic element 2 wherein { HEAD ~ T1 } is { TAIL ~ a timing } or linking group which functions by electron transfer down an unconjugated chain and is of the formula
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH