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Examination of Structure and Bonding in 10-Coordinate Europium and Americium Terpyridyl Complexes
Frankie D White1, Alyssa N Gaiser1, Evan J Warzecha1
1Department of Chemistry and Biochemistry , Florida State University , Tallahassee , Florida 32306 , United States.
Abstract:
M(TpyNO2)(NO3)3(H2O)·THF (M = La, Nd, Sm, Eu, Tb, Am; TpyNO2 = 4'-nitrophenyl terpyridyl) have been prepared from the reaction of M(NO3)3· nH2O with TpyNO2 in THF. Structural analysis shows that the metal centers are 10-coordinate, providing the first example of AmIII with this coordination number. Further spectroscopic and theoretical evaluation of these complexes reveals utilization of the 5f orbitals in bonding in the AmIII complex. Comparison of Nd-L, Eu-L, and Am-L bond distances demonstrates that some caution should be taken in comparing EuIII versus AmIII in extraction experiments.
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