kfeiii [ feii ( cn ) 6 ] ( i ) and feiii4 [ feii ( cn ) 6 ] 3 ( ii ) were labelled with 59fe both in the fe ( iii ) -position ( outside the complex anion , a ) or in the fe ( ii ) -position ( hexacyanoferrate anion , b ) .
C0021966
i
C0003075
anion