An ESR study of the polymerization of tetrahydrofuran with simple inorganic cations containing sulphur and nitrogen

Fairhurst, Shirley A.; Hulme-Lowe, Alan; Johnson, Karen M.; Sutcliffe, L. H.; Passmore, Jack; Schriver, Melbourne J.

doi:10.1002/mrc.1260231008

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1990

1994

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Cited by 13 publications

References 15 publications

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Electron spin resonance spectroscopy of free radicals containing sulphur linked to nitrogen

Preston¹,

Sutcliffe²

1990

Magnetic Reson in Chemistry

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There is an abundance of information on closed-shell compounds containing sulphur linked to nitrogen; much less, of course, is known about free radicals containing this moeity. This review describes the wide variety of these radicals, their remarkable stability, the characteristic values of their ESR parameters, their electronic structures and their potential applications.KEY WORDS Electron spin resonance spectroscopy Free radicals Sulphur-nitrogen-containing free radicals 14N hyperfine interactions 33S hyperfine interactions powder spectra

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Electron spin resonance spectroscopy of free radicals containing sulphur linked to nitrogen

Preston¹,

Sutcliffe²

1990

Magnetic Reson in Chemistry

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Dithiadiazolium salts as initiators for the cationic ring‐opening polymerization of tetrahydrofuran

Banister

Luke

1992

J. Polym. Sci. A Polym. Chem.

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Mono‐, bis‐ and tris‐(1,3,2,4‐dithiadiazolium) salts [R‐(CNSNS+)n]n+[AsF‐6]n (R = aryl, n = 1, 2, 3) were found to initiate the cationic ring‐opening polymerization of tetrahydrofuran (THF) at room temperature to give clear gels from which the pure polymer was precipitated. 1,3,2,4‐Dithiadiazolium cations associated with the hard [AsF6]‐ anion thus constitute a new class of cationic polymerization initiators. The poly(THF) formed by initiation with 1,3,2,4‐dithiadiazolium cation was characterized by gel permeation chromatography, infrared spectrophotometry, and 13C‐NMR spectroscopy. Number‐average molecular weights of 198 700 g mol‐1 (polydispersity 1.96) and 190 000 g mol‐1 (polydispersity 1.61) were obtained using [PhCNSNS] [AsF6] and [C6H3‐1,3,5‐(CNSNS)3][AsF6]3, respectively, as initiators. The use of multifunctional dithiadiazolium salts as initiators suggests that they may be useful in the preparation of starburst and dendritic polymers. © 1992 John Wiley & Sons, Inc.

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Sulfur Amide Halogenides and Derivatives

Baumann¹,

Fachmann²,

Jotter³

et al. 1994

S Sulfur-Nitrogen Compounds

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An ESR study of the polymerization of tetrahydrofuran with simple inorganic cations containing sulphur and nitrogen

Cited by 13 publications

References 15 publications

Electron spin resonance spectroscopy of free radicals containing sulphur linked to nitrogen

Electron spin resonance spectroscopy of free radicals containing sulphur linked to nitrogen

Dithiadiazolium salts as initiators for the cationic ring‐opening polymerization of tetrahydrofuran

Sulfur Amide Halogenides and Derivatives

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