when n is 0 and M is palladium, {TAIL ~ Q} represent π allyl, and Y represents ClO4, {HEAD ~ PF6}, or BF4 
when n is 0 and M is palladium , { TAIL ~ Q } represent π allyl , and Y represents ClO4 , { HEAD ~ PF6 } , or BF4
OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH