Journal ArticleDOI
Bistability and the Phase Transition in 1,3,2-Dithiazolo[4,5-b]pyrazin-2-yl
Jaclyn L. Brusso,Owen P. Clements,Robert C. Haddon,Mikhail E. Itkis,Alicea A. Leitch,Richard T. Oakley,Robert W. Reed,John F. Richardson +7 more
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TLDR
The structural interconversion is suggested to proceed via the cooperative breaking and making of intermolecular S- - -N interactions and an inversion symmetry-preserving "domino cascade" of the pi-stacked rings.Abstract:
The molecular radical 1,3,2-dithiazolo[4,5-b]pyrazin-2-yl (PDTA) exhibits magnetic bistability just above room temperature, undergoing a well-defined hysteretic phase change with TC↓ = 297(1) K and TC↑ = 343(1) K. The crystal structures of the two phases of PDTA have been determined by single-crystal X-ray diffraction at 323(2) K. LT-PDTA consists of diamagnetic (S = 0) nearly superimposed π-dimer stacks, while that of HT-PDTA comprises slipped stacks of π-radicals (S = 1/2). The structural interconversion is suggested to proceed via the cooperative breaking and making of intermolecular S- - -N interactions and an inversion symmetry-preserving “domino cascade” of the π-stacked rings.read more
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Book ChapterDOI
Chalcogen–Nitrogen Radicals
R.T. Boeré,T.L. Roemmele +1 more
TL;DR: The most important chalcogen-nitrogen radicals, stable radicals and their diamagnetic oligomers, and reactive short-lived species which are key intermediates in many important processes are surveyed in this article.
Journal ArticleDOI
Modulation of intermolecular exchange interaction in organic radical based compounds: Magneto-structural analysis of phenol and imidazolium substituted oxoverdazyl radicals
TL;DR: In this paper, the synthesis of two oxoverdazyls based compounds, the 1,5-dimethyl-3-(2′-hydroxyphenyl)-6-oxoverdayl 1 and the perchlorate salt of 1, 5-dimethyltimidazolium)-6oxoverdeazyl 2 are reported, and structural analysis reveals that radicals are closely packed in regular columns by way of π-stacking.
Journal ArticleDOI
Anion substitution in hydrogen-bonded organic conductors: the chemical pressure effect on hydrogen-bond-mediated phase transition
TL;DR: In this article, the authors have synthesized three kinds of novel hydrogen-bonded (H-Bonded) organic conductor, β′-[H3(Cat-EDO-TTF)2]X (X = ClO4, PF6, AsF6; Cat-EDDO-T TF = catechol-fused ethylenedioxytetrathiafulvalene), as anion-substituted analogues of the parent BF4 salt (X= BF4).
Journal ArticleDOI
Strategy for Stimuli-Induced Spin Control Using a Liquescent Radical Cation.
TL;DR: A liquescent salt based on an N-pentylphenothiazine radical cation exhibited a unique crystal–crystal phase transition from a paramagnetic orange solid to a diamagnetic green solid induced by brief, weak, and pinpoint mechanostress.
Journal ArticleDOI
Room-Temperature Magnetic Bistability in a Salt of Organic Radical Ions.
Anni I. Taponen,Awatef Ayadi,Manu Lahtinen,Itziar Oyarzabal,Itziar Oyarzabal,Itziar Oyarzabal,Sébastien Bonhommeau,Mathieu Rouzières,Corine Mathonière,Heikki M. Tuononen,Rodolphe Clérac,Aaron Mailman +11 more
TL;DR: In this paper, the first example of cooperative interactions between two different organic radical ions leading to magnetic bistability was revealed, and these results are central to the future design of multicomponent functional molecular materials.
References
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Journal ArticleDOI
Magneto-Opto-Electronic Bistability in a Phenalenyl-Based Neutral Radical
TL;DR: A new organic molecular conductor, based on a spiro-biphenalenyl neutral radical, simultaneously exhibits bistability in three physical channels: electrical, optical, and magnetic.
Journal ArticleDOI
Room-Temperature Magnetic Bistability in Organic Radical Crystals
TL;DR: A large first-order magnetic phase transition in an organic radical, 1,3,5-trithia-2,4,6-triazapentalenyl, is described and may have applications in thermal sensors, switching units, and information storage media based on organic radical crystals.
Journal ArticleDOI
Bistabilities in 1,3,2-dithiazolyl radicals.
Jaclyn L. Brusso,Owen P. Clements,Robert C. Haddon,Mikhail E. Itkis,Alicea A. Leitch,Richard T. Oakley,Robert W. Reed,John F. Richardson +7 more
TL;DR: A mechanism for the interconversion of the two phases of PDTA and related structures is proposed in which hysteretic behavior arises from cooperative effects associated with the breaking and making of a lattice-wide network of intermolecular S - - -N' and/or S- - -S' interactions.
Journal ArticleDOI
Redox, magnetic, and structural properties of 1,3,2-dithiazolyl radicals. a case study on the ternary heterocycle s3n5c4
a T. M. Barclay,A. W. Cordes,b N. A. George,c R. C. Haddon,c M. E. Itkis,d M. S. Mashuta,b G. W. Patenaude,b R. W. Reed,d and J. F. Richardson +8 more
TL;DR: In this article, the characterization of the heterocyclic radical 1,2,5-thiadiazolo [3,4-b]-1,3,2-dithiazolo[3, 4-b]pyrazin-2-yl (TDP-DTA) is described.
Journal ArticleDOI
Synthesis, crystal structures, electronic structure and magnetic behaviour of the trithiatriazapentalenyl radical, C2S3N3
Gordon D. McManus,Jeremy M. Rawson,Neil Feeder,Joost van Duijn,Eric J. L. McInnes,Juan J. Novoa,Ramón Burriel,Fernando Palacio,Patricia B. Oliete +8 more
TL;DR: In this article, a novel synthesis of the title compound, C2S3N3======677(1) is reported, which is based on DFT calculations and X-ray diffraction in the region 300-225k and reveals a regular π-stacked structure.