A tetravalent praseodymium complex with field-induced slow magnetic relaxation

Abstract

Herein the synthesis, structural characterization, and magnetic properties of a Pr(IV) complex [Pr(OSiPh3)4(L)] (1, L = 4,4’-dimethoxy-2,2’-bipyridine) are reported. The stability of the Pr(IV) complex has been significantly enhanced with...

Elucidating the Impact of Rare Earth or Transition Metal Identity on the Physical and Electronic Structural Properties of a Series of Redox-Active Tris(amido) Complexes

“…Evans and co-workers have successfully isolated a series of divalent lanthanide complexes and explored their unique electronic properties . Additionally, exploration of high-valent lanthanide complexes (such as Ce 4+ , Pr 4+ , and Tb 4+ ) has been undertaken by the La Pierre, Schelter, and Mazzanti groups, among others. ,,− While the renaissance of nonaqueous lanthanide chemistry continues to expand, the use of harsh reductants and oxidants is normally needed to access these redox states in lanthanide complexes. − …”

Tetravalent Cerium Alkyl and Benzyl Complexes

“…Ligand design has recently enabled the stabilization of unusual high-valent lanthanide ions in molecular complexes − and facilitated the study of tetravalent terbium − and praseodymium. ,− We have developed a class of imidophosphorane ligands that stabilize high-valent f-element ions and shift redox couples significantly cathodically. ,,− Rather than modifying the organometallic fragment to enhance its oxidative stability, this approach takes advantage of the strong stabilization of Ce 4+ by imidophosphorane ligands to afford hitherto unrealized organometallic coordination chemistry. All tetravalent imidophosphorane f-element complexes reported to date are homoleptic complexes, ,,− ,, and a key innovation in this study is the preparation of a heteroleptic, monohalide complex, [Ce 4+ I­(NP­(( tert -butyl) 3 ) 3 ] ( 1-CeI ).…”