Solvent Polarity Predictably Tunes Spin Crossover T1/2 in Isomeric Iron(II) Pyrimidine Triazoles

Inorganic Chemistry
Santiago Rodríguez-JiménezSally Brooker

Abstract

Two isomeric pyrimidine-based Rdpt-type triazole ligands were made: 4-(4-methylphenyl)-3-(2-pyrimidyl)-5-phenyl-4 H-1,2,4-triazole (L2pyrimidine) and 4-(4-methylphenyl)-3-(4-pyrimidyl)-5-phenyl-4 H-1,2,4-triazole (L4pyrimidine). When reacted with [FeII(pyridine)4(NCE)2], where E = S, Se, or BH3, two families of mononuclear iron(II) complexes are obtained, including six solvatomorphs, giving a total of 12 compounds: [FeII(L2pyrimidine)2(NCS)2] (1), [FeII(L2pyrimidine)2(NCSe)2] (2), 2·1.5H2O, [FeII(L2pyrimidine)2(NCBH3)2]·2CHCl3 (3·2CHCl3), 3 and 3·2H2O, [FeII(L4pyrimidine)2(NCS)2] (4), 4·H2O, [FeII(L4pyrimidine)2(NCSe)2] (5), 5·2CH3OH, 5·1.5H2O, and [FeII(L4pyrimidine)2(NCBH3)2]·2.5H2O (6·2.5H2O). Single-crystal X-ray diffraction reveals that the N6-coordinated iron(II) centers in 1, 2, 3·2CHCl3, 4, 5, and 5·2CH3OH have two bidentate triazole ligands equatorially bound and two axial NCE co-ligands trans-coordinated. All structures are high spin (HS) at 100 K, except 3·2CHCl3, which is low spin (LS). Solid-state magnetic measurements show that only 3·2CHCl3 ( T1/2 above 400 K) and 5·1.5H2O ( T1/2 = 110 K) undergo spin crossover (SCO); the others remain HS at 300-50 K. When 3·2CHCl3 is heated at 400 K it desorbs CHCl3 becoming 3, ...Continue Reading

References

Dec 3, 2002·Science·Gregory J HalderJohn D Cashion
Jun 18, 2003·Chemical Communications : Chem Comm·Virginie NielJosé A Real
Jun 16, 2005·Dalton Transactions : an International Journal of Inorganic Chemistry·Jośe Antonio RealM Carmen Muñoz
Apr 10, 2007·Journal of the American Chemical Society·Masayuki NiheiHiroki Oshio
Jul 17, 2007·Inorganic Chemistry·Birgit Weber, F Ann Walker
Dec 25, 2007·Acta Crystallographica. Section A, Foundations of Crystallography·George M Sheldrick
Dec 22, 2009·Chemical Communications : Chem Comm·Chou-Fu SheuYu Wang
Apr 1, 2010·Dalton Transactions : an International Journal of Inorganic Chemistry·Nicholas G WhiteSally Brooker
Mar 18, 2011·Dalton Transactions : an International Journal of Inorganic Chemistry·Ping LianChunhui Huang
Apr 13, 2011·Chemical Society Reviews·Malcolm A Halcrow
May 18, 2011·Dalton Transactions : an International Journal of Inorganic Chemistry·Simon A BarrettMalcolm A Halcrow
Mar 10, 2012·Physical Chemistry Chemical Physics : PCCP·Helena J ShepherdGábor Molnár
Mar 19, 2013·Beilstein Journal of Organic Chemistry·Philipp GütlichYann Garcia
May 15, 2013·Chemistry : a European Journal·Jacek Lukasz KolanowskiJens Hasserodt
Dec 24, 2013·Inorganic Chemistry·Zheng YanMing-Liang Tong
Jan 22, 2014·Dalton Transactions : an International Journal of Inorganic Chemistry·Mark B BushuevViktor P Krivopalov
Feb 22, 2014·Journal of the American Chemical Society·José Sánchez CostaGuillem Aromí
Oct 4, 2014·Organic & Biomolecular Chemistry·Mi-Sun KimJames P Snyder
Nov 8, 2014·Physical Chemistry Chemical Physics : PCCP·Sergi VelaJordi Ribas-Arino
Mar 4, 2015·Inorganic Chemistry·Humphrey L C FelthamSally Brooker
Apr 25, 2015·Chemical Society Reviews·Sally Brooker
Oct 16, 2015·Dalton Transactions : an International Journal of Inorganic Chemistry·Reece G MillerSally Brooker
Aug 11, 2016·Dalton Transactions : an International Journal of Inorganic Chemistry·Holm PetzoldDieter Schaarschmidt
Jan 4, 2017·Chemical Communications : Chem Comm·René NowakBirgit Weber
Apr 21, 2016·Chemical Science·Reece G Miller, Sally Brooker
Nov 22, 2017·Journal of the American Chemical Society·Santiago Rodríguez-JiménezSally Brooker

❮ Previous
Next ❯

Citations

Jul 7, 2018·Dalton Transactions : an International Journal of Inorganic Chemistry·Mark B BushuevYuri V Gatilov
Aug 21, 2018·Chemical Society Reviews·Ross W HogueSally Brooker
Dec 7, 2018·Dalton Transactions : an International Journal of Inorganic Chemistry·Sergi Vela, Hauke Paulsen
May 30, 2019·Dalton Transactions : an International Journal of Inorganic Chemistry·Sandhya SinghSally Brooker

❮ 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.