ChemInform Abstract: COMPLEXES OF NUCLEOPHILES WITH RARE EARTH CHELATES PART 2, SELF‐ASSOCIATION AND ADDUCT FORMATION OF THE LANTHANIDE TRIS(1,1,1,2,2,3,3‐HEPTAFLUORO‐7,7‐DIMETHYL‐4,6‐OCTANEDIONATE) CHELATES PR(FOD)3 AND EU(FOD)3