A possible triaquohydrogen ion H₇O₃: crystal structure of 1,1′-tetramethylene-2,2′-bipyridylium dibromide.H₂O.⅓HBr

Abstract

X-Ray crystallographic analysis indicates that relationship between structure and the herbicidal activity Our present analysis shows that in the inactive salt 1, l'-tetramethylene-Z,2'-bipyridylium dibromide (I) the inter-ring angle is 65.8" and the length of the central bond is 1-48A, in good agreement with accepted values for the C(sp2)-C(spz) single bond length.3 Crystals of (I) belong to space group R$c (D&) with crystals of the title compound contain the triaquo-exhibited by certain of these salts.lP2 hydrogen ion H,O,+.

Resonance Raman spectra of radical cations of bridged diquaternary salts of 2,2′‐bipyridine

“…111: AQ2+)t and their respective radical monocations have, in contrast, been the subject of relatively little attention. UV-visible spectra of a number of parent dications and radical monocations have been Also, X-ray crystallographic data, yielding ring-conformation data, have been reported for the parent compounds DQ"," TtQ" 24 and AQ2+, 25 in their dibromide forms. Vibrational spectroscopic study is limited to a brief report of the infrared spectrum of DQ2+ in the dibromide form.…”

Synthese und Strukturuntersuchung von Polyhalogeniden im System Iod/Brom / Syntheses and Structure Analyses of Polyhalides in the System Iodine/Bromine

“…The crystal structures of three compounds have been investigated by X-ray crystal structure analyses. BPH + (H 3 0) + (IBr 2 ) 2 -(PI, a = 780.0(3), b = 815.4(3), c = 1547.9(6) pm, a = 75.59 (7), ß = 82.28 (8), y = 88.15(8)°, R = 6.5%) contains two independent, nearly linear, asymmetric IBr 2 " groups. In BPH + I 2 Br 3 -(P2,/c, a = 1269.1 (6), b = 673.0(4), c = 2047.4 (8) pm, ß = 112.39(9)°, R = 6.3%), the anion is V-shaped like other pentahalide anions.…”

4,15-Dimethyl-7,12-diazoniatricyclo[10.4.0.02,7]hexadeca-1(12),2,4,6,13,15-hexaene dibromide monohydrate

“…BIYTEL has a trimethylene bridge, BIYTUB has a dimethylene bridge, BIYTOV has a trimethylene bridge but lacks the 4-Me substituents, BIYVAJ has a trimethylene bridge but 5-Me groups instead of 4-Me, and BIYTIP has a dimethylene bridge but is a methanol solvate. CSD entry TMEPYR (Derry & Hamor, 1970) contains a tetramethylene bridge, but lacks 4-Me subsituents. CSD entries DIQUAT (Derry & Hamor, 1969) and DQUATB (Sullivan & Williams, 1976), have dimethylene bridges but also lack the 4-Me substituents.…”