Single-molecule magnet behaviour in polynuclear assembly of trivalent cerium ions with polyoxomolybdates

Abstract

An isopolyoxomolybdate-based POM is coordinated to trivalent cerium ions to afford a hybrid complex namely, [Ce(dmso)8][Ce(η2-NO3)2(dmso)4(α-Mo8O26)0.5][Mo6O19]. The original electrostatic environment created around the Ce(III) by its coordination to the isopolyoxomolybdate core induces complex single-molecule magnet behavior.

Structural diversity and photo-physical and magnetic properties of dimeric to 1D polymeric coordination polymers of lighter lanthanide(iii) dinitrobenzoates

“…The most popular lanthanides to design SMMs are the heavier ions such as Dy(III), Tb(III) and Er(III), [41][42][43][44][45][46][47][48][49][50][51][52][53][54] notwithstanding the fact that that lighter ions such as Ce(III), Pr(III) and Nd(III) have been recently used as elaborated SMMs. [55][56][57][58][59][60][61][62] The latter, however suffer from weak spin-orbit coupling and thus the isolation of molecular magnets among them is a relatively less visited arena. [63][64][65][66][67][68] Picking up from there, we report here the synthesis, spectroscopic characterization, crystal structure determination, thermal, luminescence and magnetic properties of complexes of aromatic carboxylates, L1H (3,5dinitrobenzoic acid) and L2H (2,4-dinitrobenzoic acid) ligands with first half series of Ln(III) elements, up to Gd(III).…”

Closing the Circle of the Lanthanide-Murexide Series: Single-Molecule Magnet Behavior and Near-Infrared Emission of the NdIII Derivative

“…All three samples were rare examples of SMMs that involved light lanthanide ions [30]. Whereas several Ce III -based SMMs have been reported [30,[35][36][37][38][39][40], only few examples of Nd III -SMMs are known. We will detail them here.…”

Slow magnetic relaxation in Ni–Ln (Ln = Ce, Gd, Dy) dinuclear complexes

“…As expected, the external magnetic field has a visible effect on the relaxation behaviour of 1 (see ESI †): the relaxation time at T = 1.9 K and B DC = 0.5 T becomes τ(LF) = 60.3(5) ms as compared to 18.7(11) ms at B DC = 0.1 T. A successful data fitting requires the two-set Debye model for T > 3.5 K. SIM behaviour of the Ce(III) ions has been reviewed recently. 14 For instance, AC susceptibility studies of single-molecule magnet behaviour in polynuclear assembly of Ce(III) with polymolybdates reveal a two-channel slow relaxation with the relaxation times τ = 6009 and 217 μs at T = 1.9 K and B DC = 0.02 T. 18 There is a sizable field influence since at B DC = 0.14 T the relaxation times merge to τ = 605 μs.…”

“…The first cerium(III) based SMM was reported in 2013 15 and later other cerium(III) complexes were reported to be SMMs. [16][17][18][19] Among the lanthanide ions, the case of gadolinium(III) complexes represents another breakthrough in the theory of slow relaxation of magnetization. Despite its essentially isotropic ground state with L = 0, several materials have been reported for which magnetic anisotropy around the gadolinium(III) centre was induced by local coordination, magnetic exchange coupling or electron density donation.…”