Vibrational spectra and proposed crystal structure of some tetraphenylarsonium compounds

Abstract

The crystal structures of (C6H5)4A~BF4, (C6H5)rAsPF6, (C6H5),AsAsF6, and (C6H5),AsSbF6 have been studied by X-ray diffraction. The unit cells are all tetragonal. The fluoroborate compound is probably isostructural with (C6H5),AsFeCI,. The other three compounds are almost isostruct~~ral with (C6H5),AsFeCI4, the only change being the accon~modation of the dipyramidal PF6-ion in the space group I3 (No. 82). Infrared absorption spectra are in general agreement with previous work on tetraphenylarsonium halides and compounds with hexafluoro Group VA ions. It is concluded that crystal field effects for this series of salts do not markedly affect the vibrational spectra.

Tetraphenylphosphonium Perchlorate

“…These include: [M(py)4](C104), where py is pyridine and M = Li (Harvey, Kildea, Skelton & White, 1992) or Ag and Cu (Nilsson & Oskarsson, 1981; [Cu(N-methylimidazole)4](CIO4) (Clegg, Acott & Garner, 1984); [Ph4E~](C104), where E = Bi (Bordner & Freedman, 1973), Sb (Ferguson, Glidewell, Lloyd & Metcalfe, 1988) or As (Walford, Blattner, Feldman & Bain, 1970;Couldwell, 1979); Ph4As÷.X -, where X = WOF5 (Massa, Hermann & Dehnicke, 1982), PF6, AsF6, SbF6 and BF4 (Walford et al, 1970), HCS2 (Gattow, Drager & Engler, 1971), MnO4 (Baran, 1971), 104 (Klobasa, Burkert & Muller, 1992), SiF5 (Corfield & Ibers, 1968), FeCI4 (Cotton & Murillo, 1975) or NCS (Lazarini & Golic, 1972); PhnP+.E -, where E = PBr2S2 (Muller & Mohammed, 1984), Br (Alcock, Pennington & Willey, 1985), I (Schweizer, Baldacchini & Rheingold, 1989), Tell (Huffman & Haushalter, 1989), MnO4 (Baran, 1971) (Diemann & Muller, 1976). In these salts, the central atoms of the cations and anions occupy the crystallographic 4 axes.…”