The formula of the anionic catalyst is generally defined as M+n n wherein A represents {HEAD ~ Fe}, Ru or Os, M is a cationic species, n is an integer greater than or equal to 2, x is an integer greater than or equal to 1, y is {TAIL ~ an integer} greater than or equal to 0 and z is an integer generally corresponding to the number of available coordination bonding sites in the ruthenium complex 
The formula of the anionic catalyst is generally defined as M+n n wherein A represents { HEAD ~ Fe } , Ru or Os , M is a cationic species , n is an integer greater than or equal to 2 , x is an integer greater than or equal to 1 , y is { TAIL ~ an integer } greater than or equal to 0 and z is an integer generally corresponding to the number of available coordination bonding sites in the ruthenium complex
OTH OTH OTH OTH 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL 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 OTH OTH OTH OTH