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