2018
DOI: 10.1002/chem.201802779
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Slow Magnetic Relaxation in Lanthanoid Crown Ether Complexes: Interplay of Raman and Anomalous Phonon Bottleneck Processes

Abstract: The combination of lanthanoid nitrates with 18-crown-6 (18-c-6) and tetrahalocatecholate (X Cat , X=Cl, Br) ligands has afforded two compound series [Ln(18-c-6)(X Cat)(NO )]⋅MeCN (X=Cl, 1-Ln; X=Br, 2-Ln; Ln=La, Ce, Nd, Gd, Tb, Dy). The 18-c-6 ligands occupy equatorial positions of a distorted sphenocorona geometry, whereas the charged ligands occupy the axial positions. The analogues of both series with Ln=Ce, Nd, Tb and Dy exhibit out-of-phase ac magnetic susceptibility signals in the presence of an applied m… Show more

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Cited by 55 publications
(90 citation statements)
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“…[29][30][31] Studying and understanding the role of Raman relaxation is crucial as it can easily limit the usability of SIMs with large Ueff at high temperatures. 4,32,33 Moreover, deep understanding of relaxation mechanisms for SIMs which do not possess pure mJ ground states is also important from the point of view of molecular qubit candidates design, demonstrated for several non-dysprosium complexes so far. [34][35][36][37][38][39][40] Herein we present a thorough magnetic and EPR study of three lanthanide-based SIMs from the family of [Ln(phendo)4](NO3)3•xMeOH (Ln = Gd (Gd), Er (Er), Yb (Yb), phendo = 1,10-phenanthroline-N,N'-dioxide).…”
Section: Introductionmentioning
confidence: 99%
“…[29][30][31] Studying and understanding the role of Raman relaxation is crucial as it can easily limit the usability of SIMs with large Ueff at high temperatures. 4,32,33 Moreover, deep understanding of relaxation mechanisms for SIMs which do not possess pure mJ ground states is also important from the point of view of molecular qubit candidates design, demonstrated for several non-dysprosium complexes so far. [34][35][36][37][38][39][40] Herein we present a thorough magnetic and EPR study of three lanthanide-based SIMs from the family of [Ln(phendo)4](NO3)3•xMeOH (Ln = Gd (Gd), Er (Er), Yb (Yb), phendo = 1,10-phenanthroline-N,N'-dioxide).…”
Section: Introductionmentioning
confidence: 99%
“…S30, ESI †). 15 Magnetisation vs. field hysteresis loops were performed on 1 and 3 in light of the large energy barriers observed. Low-temperature hysteresis studies were performed on a single crystal of 1 using an array of micro-SQUIDs.…”
mentioning
confidence: 99%
“…Understanding structural effects on the CF splitting of lanthanoid complexes is of great importance for the development of high performance Ln‐SMMs. Several spectroscopic techniques have been used to probe the splitting of the ground J multiplet in Ln‐SMMs . Luminescence spectroscopy is not always feasible due to non‐radiative relaxation processes and ligand absorption.…”
Section: Investigation Of Crystal Field Splitting In Ln Complexes mentioning
confidence: 99%