when n is 0 and {HEAD ~ M} is {TAIL ~ iridium} or rhodium, Q represents 1,5 cyclo octadiene or norbornadiene, and Y represents ClO4, PF6 or BF4 ; and 
when n is 0 and { HEAD ~ M } is { TAIL ~ iridium } or rhodium , Q represents 1,5 cyclo octadiene or norbornadiene , and Y represents ClO4 , PF6 or BF4 ; and
OTH OTH OTH OTH OTH 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 OTH OTH OTH OTH OTH OTH OTH