The crystal structure of phosphorus heptabromide, PBr7

Breneman, G. L.; Willett, Roger D.

doi:10.1107/s0365110x67002981

Cited by 45 publications

(18 citation statements)

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“…For example, the BrÀBr ionic-ionic contacts between the PBr 4 + and Br À ions in PBr 5 or between the PBr 4 + and Br 3 À ions in PBr 7 . [18] Note that this value is very close to the intermolecular contacts between dibromine molecules in solid Br 2 (3.30 ). [19] In…”

Section: Resultsmentioning

confidence: 66%

Unprecedented Association of [Mo₆Brⁱ₇YⁱBr^a₆]³⁻ Cluster Units and [Mo^IIIBr₆]³⁻ Complexes: Synthesis, Crystal Structures, and Properties of the Double Salts Rb₃[Mo₆Brⁱ₇YⁱBr^a₆](Rb₃[MoBr₆])₃ (Y=Se, Te)

Kirakci

Cordier

Perrin

2006

Chemistry A European J

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The double salts Rb(3)[Mo(6)Br(i) (7)Y(i)Br(a) (6)](Rb(3)[MoBr(6)])(3) (Y=Se, Te) result from the partial disproportionation of the Mo(6)Br(12) octahedral-cluster-based bromide, in the presence of corresponding chalcogenides and RbBr salt (crystal data: Rb(12)[MoBr(6)](3)[Mo(6)Br(i) (7)Te(i)Br(a) (6)] (1), Pm$\bar 3$m (No. 221), a=12.1558(2) A, Z=1, R(1)=0.028; wR(2)=0.050; Rb(12)[MoBr(6)](3)[Mo(6)Br(i) (7)Se(i)Br(a) (6)] (2), Pm$\bar 3$m, a=12.144(3) A, Z=1, R(1)=0.028; wR(2)=0.050). The structures of 1 and 2 are built up from [Mo(III)Br(6)](3-) complexes and [Mo(6)Br(i) (7)Y(i)Br(a) (6)](3-) cluster units characterised by a random distribution of seven bromine and one chalcogen ligands on all the eight inner positions that face cap the Mo(6) clusters. Such a distribution implies a static orientational disorder of the [Mo(6)Br(i) (7)Y(i)Br(a) (6)](3-) units around the origin of the unit cell. Close-packed anionic layers based on [Mo(III)Br(6)](3-) complexes and [Mo(6)Br(i) (7)Y(i)Br(a) (6)](3-) cluster units are stacked in the sequence ABC. This arrangement leads to very short Br(a)--Br(a) intercluster unit distances of 3.252 A, much lower than the sum of the van der Waals radii (3.70 A). The trivalent oxidation state of molybdenum in the Mo complexes and 24 valence electrons per Mo(6) cluster have been confirmed by magnetic susceptibility measurements. Salts 1 and 2 constitute the first examples of structurally characterised bromides containing discrete [Mo(III)Br(6)](3-) complexes obtained by means of solid-state synthesis.

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Section: Resultsmentioning

confidence: 66%

Unprecedented Association of [Mo₆Brⁱ₇YⁱBr^a₆]³⁻ Cluster Units and [Mo^IIIBr₆]³⁻ Complexes: Synthesis, Crystal Structures, and Properties of the Double Salts Rb₃[Mo₆Brⁱ₇YⁱBr^a₆](Rb₃[MoBr₆])₃ (Y=Se, Te)

Kirakci

Cordier

Perrin

2006

Chemistry A European J

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“…Among these, the polybromide anions have shown the largest variety. Especially our knowledge about dianions was vastly expanded due to the structures of [ [3,4] or of polybromide networks [3, 5 -7] 3 ] − has been fully characterized, including the single-crystal structure of one of its salts [1,8,9]. Beyond this, no structural data of a higher polybromide monoanion was known prior to our reports in recent years.…”

Section: Introductionmentioning

confidence: 94%

[HMIM][Br₉]: a Room-temperature Ionic Liquid Based on a Polybromide Anion

Haller

Hog

Scholz

et al. 2013

Zeitschrift Für Naturforschung B

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“…Structural studies of the tribromide ion previously done have shown that Br~-in [(CH3)3NH÷]zBr-Br~ (Romers & Keulemans, 1958) is an essentially symmetrical ion with the two bond lengths almost equal while Br~-in PBr7 (Breneman & Willett, 1967) is extremely distorted from the symmetrical configuration with the two bond lengths differing by more than 0.5 •. Both of these Br~-ions are essentially linear.…”

Section: Introductionmentioning

confidence: 99%

The crystal structure of cesium tribromide and a comparison of the Br₃ ⁻ and I₃ ⁻ systems

Breneman¹,

Willett²

1969

Acta Crystallogr Sect B

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The crystal structure of CsBr3 has been determined by X-ray diffraction techniques. The unit cell is orthorhombic with a=6.52, b=10.04 and c=9"54A. The space group is Pmnb. The tribromide ion is nearly linear, but unsymmetrical, with Br-Br distances of 2.440 and 2.698 A,. The Br7 ions in this compound, in PBr7, and in [(CH3)3NH+]2Br-Br7 form a system analogous to that of 17 in which the configuration of the trihalide ion depends on the cation present in the crystal. A qualitative discussion comparing the two systems is given.

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The crystal structure of phosphorus heptabromide, PBr7

Cited by 45 publications

References 3 publications

Unprecedented Association of [Mo₆Brⁱ₇YⁱBr^a₆]³⁻ Cluster Units and [Mo^IIIBr₆]³⁻ Complexes: Synthesis, Crystal Structures, and Properties of the Double Salts Rb₃[Mo₆Brⁱ₇YⁱBr^a₆](Rb₃[MoBr₆])₃ (Y=Se, Te)

Unprecedented Association of [Mo₆Brⁱ₇YⁱBr^a₆]³⁻ Cluster Units and [Mo^IIIBr₆]³⁻ Complexes: Synthesis, Crystal Structures, and Properties of the Double Salts Rb₃[Mo₆Brⁱ₇YⁱBr^a₆](Rb₃[MoBr₆])₃ (Y=Se, Te)

[HMIM][Br₉]: a Room-temperature Ionic Liquid Based on a Polybromide Anion

The crystal structure of cesium tribromide and a comparison of the Br₃ ⁻ and I₃ ⁻ systems

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The crystal structure of phosphorus heptabromide, PBr7

Cited by 45 publications

References 3 publications

Unprecedented Association of [Mo6Bri7YiBra6]3− Cluster Units and [MoIIIBr6]3− Complexes: Synthesis, Crystal Structures, and Properties of the Double Salts Rb3[Mo6Bri7YiBra6](Rb3[MoBr6])3 (Y=Se, Te)

Unprecedented Association of [Mo6Bri7YiBra6]3− Cluster Units and [MoIIIBr6]3− Complexes: Synthesis, Crystal Structures, and Properties of the Double Salts Rb3[Mo6Bri7YiBra6](Rb3[MoBr6])3 (Y=Se, Te)

[HMIM][Br9]: a Room-temperature Ionic Liquid Based on a Polybromide Anion

The crystal structure of cesium tribromide and a comparison of the Br3 − and I3 − systems

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Unprecedented Association of [Mo₆Brⁱ₇YⁱBr^a₆]³⁻ Cluster Units and [Mo^IIIBr₆]³⁻ Complexes: Synthesis, Crystal Structures, and Properties of the Double Salts Rb₃[Mo₆Brⁱ₇YⁱBr^a₆](Rb₃[MoBr₆])₃ (Y=Se, Te)

Unprecedented Association of [Mo₆Brⁱ₇YⁱBr^a₆]³⁻ Cluster Units and [Mo^IIIBr₆]³⁻ Complexes: Synthesis, Crystal Structures, and Properties of the Double Salts Rb₃[Mo₆Brⁱ₇YⁱBr^a₆](Rb₃[MoBr₆])₃ (Y=Se, Te)

[HMIM][Br₉]: a Room-temperature Ionic Liquid Based on a Polybromide Anion

The crystal structure of cesium tribromide and a comparison of the Br₃ ⁻ and I₃ ⁻ systems