Ferro- or antiferromagnetism? Heisenberg chains in the crystal structures of verdazyl radicals

Physical Chemistry Chemical Physics : PCCP
S EusterwiemannJ Neugebauer

Abstract

In this study, we address the question of the origin of ferromagnetic or antiferromagnetic interactions in alkynyl-substituted 1,5-diphenyl-6-oxo verdazyl radicals. While a TMS-alkynyl derivative (3) shows antiferromagnetic ordering at low temperatures, the corresponding deprotected alkynyl verdazyl (4) shows ferromagnetic interactions. For both compounds, magnetic Heisenberg chains are characteristic, which were studied systematically by means of X-ray crystallography and quantum chemical calculations. Ferromagnetic interactions are rarely found in such radicals. Therefore, uncovering such structure-property relationships is of crucial importance in order to understand and design promising ferromagnetic networks. Using this knowledge, we were able to design and crystallize diyne derivatives showing comparable solid state characteristics and therefore antiferro- and ferromagnetic Heisenberg chain structures. We show that the understanding of such property-structure relationships is adequate for the design of organic-magnetic materials with defined cooperative effects within the class of verdazyl radicals.

References

Nov 17, 2001·Science·A RajcaS Rajca
May 27, 2004·Journal of the American Chemical Society·Andrzej RajcaSuchada Rajca
Jan 19, 2006·Journal of the American Chemical Society·Bryan D KoivistoRobin G Hicks
Apr 28, 2007·Organic & Biomolecular Chemistry·Robin G Hicks
Oct 12, 2007·Organic Letters·Joe B GilroyRobin G Hicks
Apr 12, 2008·Physical Chemistry Chemical Physics : PCCP·Marina AlloisioGiovanna Dellepiane
Oct 7, 2010·The Journal of Physical Chemistry. a·Debojit BhattacharyaAnirban Misra
Jun 29, 2011·The Journal of Organic Chemistry·Matthew Bancerz, Michael K Georges
Aug 19, 2011·Chemical Society Reviews·Imma Ratera, Jaume Veciana
Dec 23, 2011·Chemistry, an Asian Journal·Martin VérotVincent Robert
Jun 6, 2012·The Journal of Physical Chemistry. a·Kyoung Chul KoJin Yong Lee
Jun 18, 2014·The Journal of Physical Chemistry. a·Daeheum ChoJin Yong Lee
Oct 7, 2016·Physical Chemistry Chemical Physics : PCCP·Thomas DresselhausJohannes Neugebauer
Nov 15, 2016·Chemical Communications : Chem Comm·Kristina LekinRichard T Oakley
Jun 13, 2017·Physical Chemistry Chemical Physics : PCCP·S EusterwiemannA Studer
Aug 1, 2015·Chemical Science·David MatuschekArmido Studer

❮ Previous
Next ❯

Citations


❮ Previous
Next ❯

Methods Mentioned

BETA
X-ray

Related Concepts

Trending Feeds

COVID-19

Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Blastomycosis

Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.

Microbicide

Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.

Related Papers

Physical Review. B, Condensed Matter
H Nakano, M Takahashi
Physical Review. B, Condensed Matter
T Sakai, M Takahashi
Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry
Masayuki HataShin'ichi Nakatsuji
© 2022 Meta ULC. All rights reserved