Iron promoted end-on dinitrogen-bridging in heterobimetallic complexes of uranium and lanthanides

Abstract

End-on binding of dinitrogen to low valent metal centres is common in transition metal chemistry but remains extremely rare in f-elements chemistry. In particular, heterobimetallic end-on N2 bridged complexes of...

Coordination of Al(C6F5)3vs. B(C6F5)3 on group 6 end-on dinitrogen complexes: chemical and structural divergences

“…Note that this synthetic approach parallels a recent work published by Mazzanti and coworkers where they reported the coordination of f-elements (lanthanides and uranium) to an end-on dinitrogen iron complex leading to the formation of N 2 bridged heterobimetallic adducts. 99 Last but not least, the close proximity of the two activated dinitrogen motifs in these adducts (imparted by their cis -configuration) may pave the way towards new type of N 2 reactivity. DFT calculations show that the diminished level of N 2 activation in these systems, evidenced experimentally by comparison of IR and XRD data to those of the 1 : 1 adducts, can be interpreted by a destabilisation of a σ-symmetric, W–N antibonding component of the W–N–N bonding.…”