Spin Crossover in Double Salts Containing Six- and Four-Coordinate Cobalt(II) Ions

Inorganic Chemistry
Joanna Palion-GazdaMiguel Julve

Abstract

The preparation and spectroscopic and structural characterization of three cobalt(II) complexes of formulas [Co(tppz)2](dca)2(1), [Co(tppz)2][Co(NCS)4]·MeOH (2), and [Co(tppz)2][Co(NCO)4]·2H2O (3) [tppz = 2,3,5,6-tetrakis(2-pyridyl)pyrazine and dca = dicyanamide] are reported here. Compounds 1-3 have in common the presence of the cationic [Co(tppz)2]2+entity where each mer-tridentate tppz ligand coordinates to the cobalt(II) ion equatorially through two pyridyl donors and axially via the pyrazine, completing the six-coordination. The electroneutrality is achieved by the organic dca group (1) and the anionic tetrakis(thiocyanato-κN)cobaltate(II) (2) and tetrakis(cyanato-κN)cobaltate(II) (3) complexes. Direct current (dc) magnetic susceptibility measurements of 1 in the temperature range 1.9-400 K show the occurrence of a thermally induced spin crossover behavior of the [Co(tppz)2]2+unit from a high spin (S = 3/2) at higher temperatures to a low-spin (S = 1/2) at lower temperatures, with the low spin phase being reached at T ≤ 200 K. X-band electron paramagnetic resonance (EPR) measurements in solution at low temperatures were used to characterize the low spin state. An analytical expression based on the combination of the spin-o...Continue Reading

References

Nov 24, 2004·Dalton Transactions : an International Journal of Inorganic Chemistry·José CarranzaMiguel Julve
Jan 22, 2005·Acta Crystallographica. Section B, Structural Science·Mathieu MarchivieDaniel Chasseau
Dec 25, 2007·Acta Crystallographica. Section A, Foundations of Crystallography·George M Sheldrick
Mar 13, 2008·Dalton Transactions : an International Journal of Inorganic Chemistry·C YusteM Julve
Dec 22, 2009·Dalton Transactions : an International Journal of Inorganic Chemistry·Consuelo YusteMiguel Julve
Aug 20, 2010·Dalton Transactions : an International Journal of Inorganic Chemistry·Colin A Kilner, Malcolm A Halcrow
Apr 13, 2011·Chemical Society Reviews·Malcolm A Halcrow
Sep 9, 2011·Journal of the American Chemical Society·Titel JurcaDarrin S Richeson
Dec 7, 2011·Journal of the American Chemical Society·Joseph M Zadrozny, Jeffrey R Long
Jan 10, 2012·Chemical Communications : Chem Comm·Joseph M ZadroznyJeffrey R Long
Sep 12, 2012·Journal of the American Chemical Society·Julia VallejoEmilio Pardo
Aug 6, 2013·Inorganic Chemistry·Ryuta IshikawaMasahiro Yamashita
Aug 21, 2013·Journal of the American Chemical Society·José Martínez-LilloJ Krzystek
Aug 22, 2013·Chemical Communications : Chem Comm·Deng-Ke CaoMichael D Ward
Nov 7, 2013·Inorganic Chemistry·Alexios GrigoropoulosYiannis Sanakis
Apr 26, 2014·Acta Crystallographica. Section E, Structure Reports Online·Yuya TsunezumiSatoshi Kawata
Jul 2, 2014·Nature Communications·Silvia Gómez-CocaFernando Luis
Jul 8, 2014·Inorganic Chemistry·Paula CucosMarius Andruh
Aug 15, 2014·Journal of the American Chemical Society·Lei ChenZi-Ling Xue
Sep 4, 2014·Chemical Communications : Chem Comm·Mohamed R Saber, Kim R Dunbar
Sep 10, 2014·Inorganic Chemistry·Joanna Palion-GazdaMiguel Julve
Jan 23, 2015·Dalton Transactions : an International Journal of Inorganic Chemistry·Joanna Palion-GazdaMiguel Julve
Feb 26, 2015·Dalton Transactions : an International Journal of Inorganic Chemistry·Deng-Ke CaoYan-Wei Gu
Mar 6, 2015·Dalton Transactions : an International Journal of Inorganic Chemistry·Fatemah HabibMuralee Murugesu
Apr 10, 2015·Dalton Transactions : an International Journal of Inorganic Chemistry·Judith Caballero-JiménezMuralee Murugesu

❮ Previous
Next ❯

Citations

Apr 13, 2018·Dalton Transactions : an International Journal of Inorganic Chemistry·A SwitlickaM Julve
Nov 13, 2018·Dalton Transactions : an International Journal of Inorganic Chemistry·Lei ChenZhong-Wen Ouyang
Jan 10, 2019·Dalton Transactions : an International Journal of Inorganic Chemistry·Anna SwitlickaMiguel Julve
Jul 3, 2020·Dalton Transactions : an International Journal of Inorganic Chemistry·Subrata GhoshAbhishake Mondal

❮ Previous
Next ❯

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.