Selenium Bromides. I. A Spectrophotometric Study of the Dissociation of Selenium Tetrabromide and Selenium Dibromide in Carbon Tetrachloride Solution<sup>1,2</sup>

Tideswell, N. W.; McCullough, Jason

doi:10.1021/ja01594a025

Cited by 8 publications

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“…49 We therefore recorded the 77 Se{ 1 H} NMR spectrum of a sample of PhSeBr 3 in CDCl 3 , which displayed only one peak at 861 ppm, which is close to the literature value for PhSeBr, 14 and therefore agrees with the observations of Wynne and Pearson. Indeed, the dissociation of selenium(IV) bromide species such as SeBr 4 and Ph 2 SeBr 2 has been long known, [50][51][52] with the order of degree of dissociation being SeBr 4 > PhSeBr 3 > Ph 2 Se 2 Br 2 . 49,50 It therefore appears from the solution-phase NMR spectroscopic data that both ( p-FC 6 H 4 )SeBr 3 and ( p-ClC 6 H 4 )SeBr 3 exhibit similar behaviour to PhSeBr 3 , and both dissociate in CDCl 3 to give "ArSeBr" species and Br 2 , in contrast to the ( p-XC 6 H 4 )SeCl 3 (X = F, Cl) compounds which do not appear to dissociate in solution.…”

Section: Nmr Spectroscopic Studies Of the Arsex 3 (X = CL Br) Compoundsmentioning

confidence: 99%

Structural isomerism in (p-XC6H4)SeCl3 and (p-XC6H4)SeBr3 (X = F, Cl) compounds. Co-crystallisation of cis- and trans-dimeric forms of (p-ClC6H4)SeCl2(μ-Cl)2(p-ClC6H4)SeCl2. A new structural modification for the “PhSeBr” reagent, Ph2Se2Br2, containing an elongated Se–Se bond

et al. 2012

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A series of di(para-halophenyl)diselenides, (p-XC(6)H(4))(2)Se(2) (X = F, Cl) have been reacted with three equivalents of SO(2)Cl(2) or Br(2), leading to the formation of selenium(iv) RSeX(3) compounds. The structures of (p-FC(6)H(4))SeX(3) (X = Cl, Br) have been determined, and both exhibit a dimeric RSeX(2)(μ-X)(2)RSeX(2) structure consisting of two "saw-horse" (p-FC(6)H(4))SeX(3) units linked by two halide bridges, with an overall square pyramidal geometry at selenium. In both structures all the selenium and halogen atoms are planar, with both aryl rings located on the same side of the Se(2)X(6) plane (cis-isomer). The structure of (p-ClC(6)H(4))SeCl(3) also adopts a planar dimeric structure, however both cis- and trans-dimeric molecules are co-crystallised in the unit cell. In contrast, the structure of (p-ClC(6)H(4))SeBr(3) adopts a folded cis-dimeric structure due to steric constraints. Secondary Se···X interactions to the "vacant" sixth coordination site at selenium are a feature of most of these structures, but are most prominent in the folded structure of (p-ClC(6)H(4))SeBr(3). A re-examination of the PhSeBr/PhSeBr(3) system resulted in the isolation of crystals of a second structural form of "PhSeBr". The structure of Ph(2)Se(2)Br(2) consists of two PhSeBr units linked by an elongated Se-Se bond of 2.832(4) Å, and longer secondary Se···Br interactions of 3.333(4) Å to form a chain structure. Further weak Se···Br and Br···Br interactions are present, which form loosely linked rippled sheets of selenium and bromine atoms, similar to the sheets observed for the tetrameric form, Ph(4)Se(4)Br(4).

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Section: Nmr Spectroscopic Studies Of the Arsex 3 (X = CL Br) Compoundsmentioning

confidence: 99%

Structural isomerism in (p-XC6H4)SeCl3 and (p-XC6H4)SeBr3 (X = F, Cl) compounds. Co-crystallisation of cis- and trans-dimeric forms of (p-ClC6H4)SeCl2(μ-Cl)2(p-ClC6H4)SeCl2. A new structural modification for the “PhSeBr” reagent, Ph2Se2Br2, containing an elongated Se–Se bond

et al. 2012

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To Give the Se‐Halogen Bond

Mews¹

1989

Inorganic Reactions and Methods

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Halides and Oxyhalides of the Elements of Groups Vb and VIb

George

1960

Progress in Inorganic Chemistry

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Selenium Bromides. I. A Spectrophotometric Study of the Dissociation of Selenium Tetrabromide and Selenium Dibromide in Carbon Tetrachloride Solution^1,2

Cited by 8 publications

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Structural isomerism in (p-XC6H4)SeCl3 and (p-XC6H4)SeBr3 (X = F, Cl) compounds. Co-crystallisation of cis- and trans-dimeric forms of (p-ClC6H4)SeCl2(μ-Cl)2(p-ClC6H4)SeCl2. A new structural modification for the “PhSeBr” reagent, Ph2Se2Br2, containing an elongated Se–Se bond

Structural isomerism in (p-XC6H4)SeCl3 and (p-XC6H4)SeBr3 (X = F, Cl) compounds. Co-crystallisation of cis- and trans-dimeric forms of (p-ClC6H4)SeCl2(μ-Cl)2(p-ClC6H4)SeCl2. A new structural modification for the “PhSeBr” reagent, Ph2Se2Br2, containing an elongated Se–Se bond

To Give the Se‐Halogen Bond

Halides and Oxyhalides of the Elements of Groups Vb and VIb

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Selenium Bromides. I. A Spectrophotometric Study of the Dissociation of Selenium Tetrabromide and Selenium Dibromide in Carbon Tetrachloride Solution1,2

Cited by 8 publications

References 0 publications

Structural isomerism in (p-XC6H4)SeCl3 and (p-XC6H4)SeBr3 (X = F, Cl) compounds. Co-crystallisation of cis- and trans-dimeric forms of (p-ClC6H4)SeCl2(μ-Cl)2(p-ClC6H4)SeCl2. A new structural modification for the “PhSeBr” reagent, Ph2Se2Br2, containing an elongated Se–Se bond

Structural isomerism in (p-XC6H4)SeCl3 and (p-XC6H4)SeBr3 (X = F, Cl) compounds. Co-crystallisation of cis- and trans-dimeric forms of (p-ClC6H4)SeCl2(μ-Cl)2(p-ClC6H4)SeCl2. A new structural modification for the “PhSeBr” reagent, Ph2Se2Br2, containing an elongated Se–Se bond

To Give the Se‐Halogen Bond

Halides and Oxyhalides of the Elements of Groups Vb and VIb

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Selenium Bromides. I. A Spectrophotometric Study of the Dissociation of Selenium Tetrabromide and Selenium Dibromide in Carbon Tetrachloride Solution^1,2