106870-65-9Relevant academic research and scientific papers
Antimony-ligated dysprosium single-molecule magnets as catalysts for stibine dehydrocoupling
Pugh, Thomas,Chilton, Nicholas F.,Layfield, Richard A.
, p. 2073 - 2080 (2017/03/09)
Single-molecule magnets (SMMs) are coordination compounds that exhibit magnetic bistability below a characteristic blocking temperature. Research in this field continues to evolve from its fundamental foundations towards applications of SMMs in information storage and spintronic devices. Synthetic chemistry plays a crucial role in targeting the properties that could ultimately produce SMMs with technological potential. The ligands in SMMs are invariably based on non-metals; we now report a series of dysprosium SMMs (in addition to their magnetically dilute analogues embedded in yttrium matrices) that contain ligands with the metalloid element antimony as the donor atom, i.e. [(η5-Cp′2Dy){μ-Sb(H)Mes}]3 (1-Dy) and [(η5-Cp′2Dy)3{μ-(SbMes)3Sb}] (2-Dy), which contain the stibinide ligand [Mes(H)Sb]? and the unusual Zintl-like ligand [Sb4Mes3]3?, respectively (Cp′ = methylcyclopentadienyl; Mes = mesityl). The zero-field anisotropy barriers in 1-Dy and 2-Dy are Ueff = 345 cm?1 and 270 cm?1, respectively. Stabilization of the antimony-ligated SMMs is contingent upon careful control of reaction time and temperature. With longer reaction times and higher temperatures, the stibine pro-ligands are catalytically dehydrocoupled by the rare-earth precursor complexes. NMR spectroscopic studies of the yttrium-catalysed dehydrocoupling reactions reveal that 1-Y and 2-Y are formed during the catalytic cycle. By implication, 1-Dy and 2-Dy should also be catalytic intermediates, hence the nature of these complexes as SMMs in the solid-state and as catalysts in solution introduces a strategy whereby new molecular magnets can be identified by intercepting species formed during catalytic reactions.
Catalytic antimony-antimony bond formation through stibinidene elimination from zirconocene and hafnocene complexes
Waterman, Rory,Tilley, T. Don
, p. 2926 - 2929 (2007/10/03)
(Figure Presented) Bringing together: Zirconium and hafnium d0 metallocene complexes catalyze the dehydrocoupling of the stibines MesSbH 2 (Mes = mesityl) and dmpSbH2 (dmp = 2,6-dimesitylphenyl) to Sb4Mes4 and (dmp)Sb=Sb(dmp), respectively, with liberation of H2. Kinetic analysis shows that thermal decomposition of hafnium stibide complexes proceeds through α-hydrogen migration and stibinidene elimination.
