Antisymmetric exchange in two tricopper(II) complexes containing a [Cu3(micro3-OMe)]5+ core

Dalton Transactions : an International Journal of Inorganic Chemistry
Xiaoming LiuMalcolm A Halcrow

Abstract

Reaction of CuX2(X-=Cl- or Br-) with 2 molar equivalents of 3[5]-(2,4,6-trimethylphenyl)pyrazole (HpzMes) in MeOH in the presence of NaOH yields [Cu3X(HpzMes)2(micro-pzMes)3(micro3-OMe)]X (X-=Cl- or Br-). Crystal structures of these compounds show almost identical triangles of Cu(II) ions, centred by a triply bridging methoxide ligand and with three edge-bridging pyrazolide groups. The mesityl substituents on the bridging pyrazolide ligands are arranged in HT, HH, TT fashion. chi(M)T for both compounds decreases steadily with decreasing temperature, reaching 0.40 cm(3) mol(-1) K at 70 K before decreasing further below 40 K. This low temperature behaviour could not be interpreted using conventional superexchange Hamiltonians, but was reproduced by an alternative model that incorporated an additional antisymmetric exchange term. This interpretation was confirmed by the Q-band EPR spectra of the two compounds. NMR experiments show that the structures of these compounds are not retained in solution, in contrast to other closely related tricopper compounds. These are the first examples of triangular Cu(II) compounds bearing a [Cu3micro3-OR)]5+(R is not equal to H) core motif, and the first triangular compounds showing antisymmetric ...Continue Reading

References

Apr 25, 2003·Acta Crystallographica. Section C, Crystal Structure Communications·Xiaoming LiuMalcolm A Halcrow

❮ Previous
Next ❯

Citations

Aug 27, 2011·Inorganic Chemistry·Santiago ReinosoLuis Lezama
Oct 7, 2016·Dalton Transactions : an International Journal of Inorganic Chemistry·Anindita ChakrabortyTapas Kumar Maji
Apr 1, 2015·Dalton Transactions : an International Journal of Inorganic Chemistry·Lilia CroitorMarina S Fonari
Jun 15, 2018·Physical Chemistry Chemical Physics : PCCP·Logesh MathivathananRaphael G Raptis
Mar 28, 2007·Dalton Transactions : an International Journal of Inorganic Chemistry·Q Folshade MokuoluMalcolm A Halcrow
Sep 11, 2007·Dalton Transactions : an International Journal of Inorganic Chemistry·Paul D CroucherSally Brooker
Nov 7, 2007·Dalton Transactions : an International Journal of Inorganic Chemistry·Tereza AfratiDimitris P Kessissoglou
Jul 23, 2009·Dalton Transactions : an International Journal of Inorganic Chemistry·Ekaterina M ZuevaJohn E McGrady
Feb 14, 2006·Dalton Transactions : an International Journal of Inorganic Chemistry·Isabelle Gautier-LuneauJean-Louis Pierre
Jan 24, 2006·Dalton Transactions : an International Journal of Inorganic Chemistry·Christopher M PaskMalcolm A Halcrow
Aug 3, 2006·Dalton Transactions : an International Journal of Inorganic Chemistry·Andrey B LysenkoKonstantin V Domasevitch
Oct 19, 2013·Dalton Transactions : an International Journal of Inorganic Chemistry·Gabriel PascuAlan F Williams
Dec 13, 2006·Dalton Transactions : an International Journal of Inorganic Chemistry·Gellert MezeiRaphael G Raptis
Mar 11, 2009·Dalton Transactions : an International Journal of Inorganic Chemistry·Malcolm A Halcrow
Oct 29, 2004·Dalton Transactions : an International Journal of Inorganic Chemistry·Matilde FondoJesús Sanmartin
Dec 19, 2020·Chemistry : a European Journal·Athanassios K Boudalis
Oct 13, 2006·Inorganic Chemistry·Sylvie L RenardMalcolm A Halcrow

❮ 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.