New synthetic pathways into dithiazolyl radicals: Preparation and characterisation of 3′-methyl-benzo-1,3,2-dithiazolyl, M’BDTA

Alberola, Antonio; Collis, Rebecca J.; Less, Robert J.; Rawson, Jeremy M.

doi:10.1016/j.jorganchem.2006.11.048

Cited by 18 publications

(10 citation statements)

References 21 publications

(24 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[28][29][30][31][32][33][34][35][36] Several other DTA derivatives exhibit spin-Peierls like behaviour. 37,38 Amongst these spin-transition dithiazolyls, TTTA has been most comprehensively studied and is presented as a case study in the next section.…”

Section: Spin-transition Radical Dimersmentioning

confidence: 99%

See 1 more Smart Citation

Reversible Spin Pairing in Crystalline Organic Radicals

Rawson

Hayward

2013

Spin‐Crossover Materials

Self Cite

View full text Add to dashboard Cite

The concept of high spin and low spin configurations in d-block complexes is taught in every undergraduate introduction to the coordination chemistry of the transition metals. In this situation the interplay between interelectron repulsion or 'pairing energy' (P E ) and crystal (ligand) field splitting ( ) determines the electronic structure and provides an elegant example of how chemical tuning and modification of the ligand donor set can manipulate electronic structure. When is of a similar magnitude to P E then there is a fine balance between crystal field stabilisation energy (an enthalpic term which favours the low spin configuration) and maximising the number of microstates (an entropic term which favours the high spin configuration). In these cases spin-transitions typically occur between a low temperature enthalpically stabilised low spin configuration and a high temperature entropically favoured high spin configuration. The ability to drive spin-transitions thermally, through light-irradiation or pressure-induced transitions are the focus of the rest of this book. In this chapter we consider organic 'spin-transition' materials whose electronic structures can be manipulated in a conceptually similar but substantially different chemical fashion, that is by examining the fine interplay between inter-electron repulsion (P E ) and promotion energy to a low-lying vacant orbital ( ) within the context of organic chemistry.In order to understand the behaviour of such systems we shall begin with a discussion (Section 8.2) of stable free-radicals and their tendency to associate to form dimers, focusing on computational and experimental studies of the electronic structures of these dimers in the gas phase and in solution. In Section 8.3 we extend these discussions to the solid state and investigate examples in which we observe (i) thermal population of electronic excited states leading to a gradual thermal evolution of paramagnetism upon warming and (ii) firstorder solid state phase transitions in which bond cleavage can lead to abrupt diamagnetic-paramagnetic phase Spin-Crossover Materials: Properties and Applications, First Edition. Edited by Malcolm A. Halcrow.

show abstract

Section: Spin-transition Radical Dimersmentioning

confidence: 99%

“…Whilst neutral organic molecules tend to favour herringbone motifs, 46 the inclusion of electronegative atoms in the molecular backbone of DTAs appears to favour the layer-like motifs desirable for spin-transition properties. [31][32][33][34][35] …”

Section: Summary and Future Perspectivesmentioning

confidence: 99%

Reversible Spin Pairing in Crystalline Organic Radicals

Rawson

Hayward

2013

Spin‐Crossover Materials

Self Cite

View full text Add to dashboard Cite

show abstract

“…Aromatic disulfenyl dichlorides 16 react with trimethylsilyl azide with the formation of benzo-1,3,2-dithiazolium salts 17 [4][5][6][7][8]. The reaction is usually conducted at temperatures between 0°C and room temperature in neutral solvents -dichloromethane or dichloroethane or more rarely tetrahydrofuran.…”

Section: Reactions Of O-disulfenyl Dichlorides With Trimethylsilyl Azidementioning

confidence: 99%

“…Various reducing agents can be used for the synthesis of 1,3,2-dithiazole radicals condensed with heterocycles: triphenylantimony for the production of the radicals 81 [12] and 82 [5], sodium hydrosulfite for compound 82 [13], silver in acetonitrile for pyridodithiazolyls 83 [7]. At the same time, it was recently shown that it is convenient to use the polymethyl derivatives of ferrocene as reducing agents since the number of methyl groups can substantially change the reducing ability of ferrocene.…”

Section: Reactions At Cyclic Nitrogen and Sulfur Atomsmentioning

confidence: 99%

Synthesis and reactivity of 1,3,2-dithiazoles (review)

Попов

Konstantinova

Ракитин

2011

Chem Heterocycl Comp

View full text Add to dashboard Cite

show abstract

“…In both cases the key benzo-substituted sulfenyl chloride was prepared in two steps from the parent dichlorobenzonitrile and ''Less' reagent'', [ t BuS]Na, which we have found provides a mild route into sulfenyl chloride chemistry; [15,16] Treatment of dichlorobenzonitrile with two equivalents of [ t BuS]Na in DMI (1,3-dimethyl-2-imidazolidinone) led to the dithiolate under mild conditions. The tert-butyl derivative is considerably bulky and deprotection of the thiolate occurs readily by chlorination with Cl 2 in CCl 4 at 0°C.…”

Section: Synthesis Of 4-ncbdtamentioning

confidence: 99%