Structure of the new fluoro complex of tungsten(VI): [WF4(bipy)2]2+ · 2[W2O2F9]− · 0.25HF (bipy = 2,2′-bipyridyl)

Thermal properties of N-alkyl-N-methylpyrrolidinium and N-butylpyridinium fluorometallates and physicochemical properties of their melts

“…The Raman active n 2 and IR active n 4 mode are too weak to be detected in the present salts. Although the molecular geometry of WF 7 À in BMPyrWF 7 is unknown, the possible three candidates, monocapped octahedron, monocapped trigonal prism, and pentagonal bipyramid, are considered to give a strong peak at $700 cm À1 in the Raman spectrum as reported in the previous literatures [22][23][24]. The absorption band observed around 580 cm À1 in the IR spectrum also agrees with the band observed in other WF 7 À salts [20].…”

Neutral and cationic tungsten(vi) fluoride complexes with tertiary phosphine and arsine coordination

“…[9][10][11][12][13][14][15][16][17] Well-documented examples including [WF 6 (2-F-py)] (capped trigonal prism), 13 [WF 6 (py) 2 ] (bicapped trigonal prism), 14 [WF 6 (2,2 0 -bipy)] (structure unknown) 16 and the [WF 4 (2,2 0 -bipy) 2 ] 2+ cation (distorted dodecahedron). 15,16 On the other hand, reaction of WF 6 with sulfite esters, (RO) 2 SO (R = alkyl), or phosphites, (RO) 3 P, result in OR/F exchange to give, for example, [WF 5 (OR)], 12,18 while reaction of WF 6 with OMe 2 causes O/F exchange, forming [WOF 4 (OMe 2 )]. 12 Similar chemistry has been further developed and exploited to provide a useful entry into WOF 4 chemistry, by reaction of WF 6 with (Me 3 Si) 2 O in MeCN solution to form [WOF 4 (MeCN)], from which the MeCN is easily displaced by other neutral ligands.…”

“…These results are reminiscent of the [WF 4 (2,2 0 -bipy) 2 ] 2+ systems described above. 15,16 The structures of the cations are shown in Fig. 1 Multinuclear NMR spectra were obtained from freshly prepared solutions in anhydrous MeCN.…”

Crystal structure of an ordered [WOF5]− salt: (1,10-phen-H)[WOF5] (1,10-phen = 1,10-phenanthroline)

“…In all cases, mutual cis arrangements of the oxido ligands are preferred (i.e., cis-[WO 2 F 4 ] 2À and fac-[WO 3 F 3 ] 3À ). A trans influence from the oxido ligands results in increased electron density on ISSN 2056-9890 the effected fluorido ligands, and it is these fluorido ligands that participate in fluorine bridging within multinuclear systems, such as in WOF 4 and in various [W 2 O 2 F 9 ] À salts with different counterions {[H 3 O] + (Hoskins et al, 1987); [WF 4 (2,2 0bipy) 2 ] 2+ (Arnaudet et al, 1992); [Os 3 (CO) 12 H] + (Crossman et al, 1996); [XeF 5 ] + (Bortolus et al, 2020); Li-Cs + (Stene et al, 2020)}, and in [W 2 O 4 F 6 ] 2À (Wollert et al, 1991).…”