Respuesta :
Between equatorial positions, the [tex]F-P-F[/tex] angle is [tex]120[/tex]°, and between axial and equatorial positions, it is [tex]90[/tex]°.
Hence, the smallest angle will be between axial and equatorial.
What is the chemistry of phosphorus-fluorine bonds ?
It is simple to create fluorophosphine complexes of zerovalent nickel of the form[tex]Ni L[/tex][tex]4[/tex] [where[tex]L= CF3PF2, (CF3) 2PF, CCl3PF2, EtNPF2,[/tex] and [tex]C5H10NPF2[/tex] ] by reacting nickelocene with the fluoro-phosphine, frequently in the presence of relatively moderate reaction conditions. This synthetic method avoids the problems associated with displacement processes involving nickel tetracarbonyl, which inevitably result in mixtures of[tex]NiLn(CO)4 - n[/tex]. The complexes' i.r., [tex]1H-[/tex], and [tex]19F-[/tex]n.m.r. spectra are shown, and peculiar characteristics of the latter are described. Due to the presence of low-lying excited states in the phosphorus-nickel bonds, the fluorine atoms directly linked to phosphorus experience a large low-field chemical shift[tex]-17[/tex] to [tex]-59 p.p.m[/tex]upon complex formation.
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