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Issue 42, 2016
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Giant spin–phonon bottleneck effects in evaporable vanadyl-based molecules with long spin coherence

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Abstract

Vanadium(IV) complexes have recently shown record quantum spin coherence times that in several circumstances are limited by spin–lattice relaxation. The role of the environment and vibronic properties in the low temperature dynamics is here investigated by a comparative study of the magnetization dynamics as a function of crystallite size and the steric hindrance of the β-diketonate ligands in VO(acac)2 (1), VO(dpm)2 (2) and VO(dbm)2 (3) evaporable complexes (acac = acetylacetonate, dpm = dipivaloylmethanate, and dbm = dibenzoylmethanate). A pronounced crystallite size dependence of the relaxation time is observed at unusually high temperatures (up to 40 K), which is associated with a giant spin–phonon bottleneck effect. We model this behaviour by an ad hoc force field approach derived from density functional theory calculations, which evidences a correlation of the intensity of the phenomenon with ligand dimensions and the unit cell size.

Graphical abstract: Giant spin–phonon bottleneck effects in evaporable vanadyl-based molecules with long spin coherence

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Article information


Submitted
26 Jun 2016
Accepted
19 Jul 2016
First published
20 Jul 2016

Dalton Trans., 2016,45, 16635-16643
Article type
Paper

Giant spin–phonon bottleneck effects in evaporable vanadyl-based molecules with long spin coherence

L. Tesi, A. Lunghi, M. Atzori, E. Lucaccini, L. Sorace, F. Totti and R. Sessoli, Dalton Trans., 2016, 45, 16635
DOI: 10.1039/C6DT02559E

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