Slow magnetic relaxation of mononuclear complexes based on uncommon Kramers lanthanide ions Ce^III, Sm^III and Yb^III

Abstract

Based on uncommon Kramers ions CeIII, SmIII and YbIII, complexes [Ce(dppbO2)2Cl3] (1, dppbO2 = 1,2-bis(diphenylphosphino)benzene dioxide), [Sm(dppbO2)2Cl3] (2) and [Yb(dppbO2)2Cl2]Cl (3) toward single-ion magnets were obtained and fully characterized. Complexes...

Slow magnetic relaxation in Nd(iii) and Sm(iii) complexes formed in three-dimensional lanthanide-dicyanidometallate(i) frameworks exhibiting luminescent properties

“…Other compounds mostly contain an admixture composition. 59,61,62 However, the smaller g-values are consistent with other reported Sm(III) compounds. Therefore, Sm(III) holding molecular polymer follows the magnetic spin relaxation mechanism of Raman, direct, and QTM.…”

“…The detected featureless M ( H ) curves are typical for the respective lanthanide ions being in good magnetic isolation. 59…”

Layered lanthanide phosphonates Ln(2-qpH)(SO4)(H2O)2 (Ln = La, Ce, Pr, Nd, Sm): polymorphism and magnetic properties

“…Under a zero dc field, we found neither temperature nor frequency dependence of ac signals, which may be attributed to quantum tunnelling of magnetisation (QTM). 5–7 Thus, the ac susceptibility measurements were performed at 2.0 K under dc fields of 0.5–3.0 kOe for γ-Ce (Fig. S8, and Tables S7†) and 0.2–5.0 kOe for β-Nd and γ-Nd (Fig.…”

“…3,4 In contrast, the development of light lanthanide SMMs lags far behind due to the fact that lighter lanthanide ions with less than half-filled f-orbitals have smaller magnetic momentum and spin–orbit (SO) coupling than heavier lanthanides. Only some cases based on Ce( iii ) and Nd( iii ) 5–7 exhibit slow magnetisation relaxation. In most of these complexes, the quantum tunnelling of magnetisation (QTM) is usually too fast at zero field, so that slow magnetisation relaxation is only observed in the presence of a dc field, which highly limits their potential in comparison with heavy lanthanide SMMs.…”

Field-induced SIM behaviour in early lanthanide(iii) organophosphates containing 18-crown-6

“…These barrier heights associated with 1 are comparable with those of the previously reported Ce(III) based single-ion magnets (Table 1). 34,[49][50][51][52][73][74][75] The fitting of the nonlinear plot of 1/τ vs. T is depicted in Fig. 5e and f.…”