Antiferromagnetic coupling between rare earth ions and semiquinones in a series of 1:1 complexes

Dalton Transactions : an International Journal of Inorganic Chemistry
Andrea CaneschiLorenzo Sorace

Abstract

We use the strategy of diamagnetic substitution for obtaining information on the crystal field effects in paramagnetic rare earth ions using the homologous series of compounds with the diamagnetic tropolonato ligand, Ln(Trp)(HBPz(3))(2), and the paramagnetic semiquinone ligand, Ln(DTBSQ)(HBPz(3))(2), (DTBSQ = 3,5-di-tert-butylsemiquinonato, Trp = tropolonate, HBPz(3)= hydrotrispyrazolylborate) for Ln = Sm(iii), Eu(iii), Gd(iii), Tb(iii), Dy(iii), Ho(iii), Er(iii) or Yb(iii). The X-ray crystal structure of a new form of tropolonate derivative is presented, which shows, as expected, a marked similarity with the structure of the semiquinonate derivative. The Ln(Trp)(HBPz(3))(2) derivatives were then used as a reference for the qualitative determination of crystal field effects in the exchange coupled semiquinone derivatives. Through magnetisation and susceptibility measurements this empirical diamagnetic substitution method evidenced for Er(iii), Tb(iii), Dy(iii) and Yb(iii) derivatives a dominating antiferromagnetic coupling. The increased antiferromagnetic contribution compared to other radical-rare earth metal complexes formed by nitronyl nitroxide ligands may be related to the increased donor strength of the semiquinone ligand.

References

May 1, 1993·Molecular Microbiology·D Kahn
Jun 13, 2002·Chemical Reviews·Cristiano Benelli, Dante Gatteschi
Apr 17, 2003·Chemistry : a European Journal·Valérie MarvaudMichel Verdaguer
Jul 17, 2003·Journal of the American Chemical Society·Naoto IshikawaYoukoh Kaizu

❮ Previous
Next ❯

Citations

Apr 21, 2009·Chemical Communications : Chem Comm·Lucie NorelCyrille Train
Dec 18, 2015·Dalton Transactions : an International Journal of Inorganic Chemistry·Nikolay A PushkarevskySergey N Konchenko
Sep 22, 2017·Dalton Transactions : an International Journal of Inorganic Chemistry·Ian S MorganHeikki M Tuononen
Oct 28, 2009·Chemistry : a European Journal·Yan-Zhen ZhengAnnie K Powell
Apr 28, 2010·Dalton Transactions : an International Journal of Inorganic Chemistry·Nazario LopezKim R Dunbar
Jan 24, 2006·Dalton Transactions : an International Journal of Inorganic Chemistry·Alessandro BenciniLorenzo Sorace
Aug 19, 2020·Dalton Transactions : an International Journal of Inorganic Chemistry·Jérôme LongAlexander A Trifonov
Mar 10, 2011·Dalton Transactions : an International Journal of Inorganic Chemistry·Amer BaniodehAnnie K Powell
Sep 25, 2008·Dalton Transactions : an International Journal of Inorganic Chemistry·Vadapalli ChandrasekharRodolphe Clérac
Sep 15, 2017·Dalton Transactions : an International Journal of Inorganic Chemistry·Lin JiangShiping Yan
Sep 27, 2019·International Journal of Molecular Sciences·Maria Cristina ButaGabriela Ionita
Mar 21, 2019·Dalton Transactions : an International Journal of Inorganic Chemistry·Jake McGuireJoy H Farnaby
Apr 16, 2010·Inorganic Chemistry·Wayne W Lukens, Marc D Walter
Sep 27, 2014·Inorganic Chemistry·Takuya Kanetomo, Takayuki Ishida

❮ Previous
Next ❯

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.