Preparation, characterization, and crystallographic data of some substituted-pyridinium antimony(III) bromide salts

Halogen Contacts‐Induced Unusual Coloring in BiIII Bromide Complex: Anion‐to‐Cation Charge Transfer via Br⋅⋅⋅Br Interactions

“…Analysis of the literature on other halometalates with halogenated pyridinium cations reveals that similar, though less prominent, effects were observed earlier. In particular, bromoantimonates containing 2‐chloro and 2‐bromopyridinium were described as orange and red, respectively; for iodoplumbates, unusual coloring was reported for 3‐bromopyridinium and 3‐chloropyridinium . Although the authors did not focus on this phenomenon, in our opinion, it deserves further investigation for these reported compounds as well, since it is of general interest in terms of the halogen bonding concept which has been attracting keen attention .…”

Structures and Chemical Bonding in Antimony(III) Bromide Complexes with Pyridine

“…[38,39] Pyridine is a strong N-containingd onor,w hichf orms complexes with main group element halides. [19,40,41] Despite several reportso nt he spectroscopic and thermal properties of antimony trihalidespyridine complexes, [42][43][44][45][46][47][48] the number of structurally characterized molecular complexes is very limited. One of the reasonf or absence of the molecular complexes of antimony trihalides is their high affinity to water,w hich results in the formation of ionic hydrolysis products like [HPy] + 2 [Sb 2 OBr n Cl 6Àn ] 2À (n = 0,2,4).…”

Pyridine Iodine(I) Cations: Kinetic Trapping as a Sulfonate Complexes

“…Banks et al have reported the crystal structure of [PyÀ F]Trif, [11] and very recently, Riedel et al reported the unprecedented crystal structure of [PyÀ Cl][AsF 6 ]. [12] The Xray structure of pyridine bromine(I) cation is unknown, but Lawton et al [13] proposed [PyÀ Br] cation in 1974 based on unit cell and space group data. However, a closer inspection reveals it to be the protonated pyridine (pyridinium cation) with the same unit cell parameters and space group.…”

“…reported the unprecedented crystal structure of [Py−Cl][AsF 6 ] [12] . The X‐ray structure of pyridine bromine(I) cation is unknown, but Lawton et al [13] . proposed [Py−Br] cation in 1974 based on unit cell and space group data.…”