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