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Multitechnique investigation of Dy3 - implications for coupled lanthanide clusters.

ABSTRACT: In-depth investigations of the low energy electronic structures of mononuclear lanthanide complexes, including single molecule magnets, are challenging at the best of times. For magnetically coupled polynuclear systems, the task seems well nigh impossible. However, without detailed understanding of the electronic structure, there is no hope of understanding their static and dynamic magnetic properties in detail. We have been interested in assessing which techniques are most appropriate for studying lanthanide single-molecule magnets. Here we present a wide ranging theoretical and experimental study of the archetypal polynuclear lanthanide single-molecule magnet Dy3 and derive the simplest model to describe the results from each experimental method, including high-frequency electron paramagnetic resonance and far-infrared spectroscopies and cantilever torque magnetometry. We conclude that a combination of these methods together with ab initio calculations is required to arrive at a full understanding of the properties of this complex, and potentially of other magnetically coupled lanthanide complexes.

SUBMITTER: Gysler M

PROVIDER: S-EPMC6013819 | biostudies-literature | 2016 Jul

REPOSITORIES: biostudies-literature

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Multitechnique investigation of Dy<sub>3</sub> - implications for coupled lanthanide clusters.

Gysler Maren M El Hallak Fadi F Ungur Liviu L Marx Raphael R Hakl Michael M Neugebauer Petr P Rechkemmer Yvonne Y Lan Yanhua Y Sheikin Ilya I Orlita Milan M Anson Christopher E CE Powell Annie K AK Sessoli Roberta R Chibotaru Liviu F LF van Slageren Joris J

Chemical science 20160316 7

In-depth investigations of the low energy electronic structures of mononuclear lanthanide complexes, including single molecule magnets, are challenging at the best of times. For magnetically coupled polynuclear systems, the task seems well nigh impossible. However, without detailed understanding of the electronic structure, there is no hope of understanding their static and dynamic magnetic properties in detail. We have been interested in assessing which techniques are most appropriate for study ...[more]

PMID: 30155081

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Project description:BackgroundElucidation of the chain of disease transmission and identification of the source of coronavirus disease 2019 (COVID-19) infections are crucial for effective disease containment. We describe an epidemiological investigation that, with use of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) serological assays, established links between three clusters of COVID-19.MethodsIn Singapore, active case-finding and contact tracing were undertaken for all COVID-19 cases. Diagnosis for acute disease was confirmed with RT-PCR testing. When epidemiological information suggested that people might have been nodes of disease transmission but had recovered from illness, SARS-CoV-2 IgG serology testing was used to establish past infection.FindingsThree clusters of COVID-19, comprising 28 locally transmitted cases, were identified in Singapore; these clusters were from two churches (Church A and Church B) and a family gathering. The clusters in Church A and Church B were linked by an individual from Church A (A2), who transmitted SARS-CoV-2 infection to the primary case from Church B (F1) at a family gathering they both attended on Jan 25, 2020. All cases were confirmed by RT-PCR testing because they had active disease, except for A2, who at the time of testing had recovered from their illness and tested negative. This individual was eventually diagnosed with past infection by serological testing. ELISA assays showed an optical density of more than 1·4 for SARS-CoV-2 nucleoprotein and receptor binding domain antigens in titres up to 1/400, and viral neutralisation was noted in titres up to 1/320.InterpretationDevelopment and application of a serological assay has helped to establish connections between COVID-19 clusters in Singapore. Serological testing can have a crucial role in identifying convalescent cases or people with milder disease who might have been missed by other surveillance methods.FundingNational Research Foundation (Singapore), National Natural Science Foundation (China), and National Medical Research Council (Singapore).

Dataset Information

Multitechnique investigation of Dy3 - implications for coupled lanthanide clusters.

Publications

Multitechnique investigation of Dy<sub>3</sub> - implications for coupled lanthanide clusters.

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