Niobium(V) fluoride Names IUPAC names Niobium(V) fluoride
Identifiers ChemSpider ECHA InfoCard 100.029.109 EC Number UNII InChI=1S/5FH.Nb/h5*1H;/q;;;;;+5/p-5
Key: AOLPZAHRYHXPLR-UHFFFAOYSA-I
Properties F 5 Nb Molar mass 39 −1 Appearance colorlesshygroscopic solid Density 3.293 g/cm3 Melting point 72 to 73 °C (162 to 163 °F; 345 to 346 K) Boiling point 236 °C (457 °F; 509 K) reacts Solubility slightly soluble inchloroform ,carbon disulfide ,sulfuric acid Hazards GHS labellingWarning H302, H312, H314, H332 P260, P261, P264, P270, P271, P280, P301+P312, P301+P330+P331, P302+P352, P303+P361+P353, P304+P312, P304+P340, P305+P351+P338, P310, P312, P321, P322, P330, P363, P405, P501 Flash point Non-flammable Related compounds Niobium(V) chloride Niobium(V) bromide Niobium(V) iodide Vanadium(V) fluoride Tantalum(V) fluoride Related niobium fluorides
Niobium(III) fluoride Niobium(IV) fluoride Except where otherwise noted, data are given for materials in their
standard state (at 25 °C [77 °F], 100 kPa).
Chemical compound
Niobium(V) fluoride , also known asniobium pentafluoride , is theinorganic compound with the formula NbF5 . It is a colorless solid.[ 1]
Preparation and structure [ edit ] Niobium pentafluoride is obtained by treatment of any niobium compound with fluorine:[ 2]
2 Nb + 5 F2 → 2 NbF5 2 NbCl5 + 5 F2 → 2 NbF5 + 5 Cl2 As shown byX-ray crystallography , the solid consists of tetramers [NbF5 ]4 . This structure is related to that forWOF4 .[ 3]
It reacts withhydrogen fluoride to give H2 NbF7 , asuperacid . Inhydrofluoric acid , NbF5 converts to [NbF7 ]2- and [NbF5 O]2- . The relative solubility ofK2 [MFO] (M = Nb, Ta) is the basis of theMarignac process for separation of Nb and Ta.
NbCl5 forms a dimeric structure (edge-shared bioctahedron) in contrast to the corner-shared tetrameric structure of the fluoride.
Niobium(II) Niobium(III) Niobium(IV) Niobium(V)
Salts and covalent derivatives of the
fluoride ion
PF− 6 ,AsF− 6 ,SbF− 6 compoundsAlF2− 5 ,AlF3− 6 compoundschlorides, bromides, iodides SiF2− 6 ,GeF2− 6 compoundsOxyfluorides Organofluorides with transition metal, nitric acids bifluorides thionyl, phosphoryl,
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