Hafnium trifluoromethanesulfonate information

Hafnium(IV) triflate

Names
IUPAC names Hafnium(IV) trifluoromethanesulfonate
Identifiers
CAS Number	161337-67-3 Y
3D model (JSmol)	Interactive image
ChemSpider	21170913
EC Number	624-948-5
PubChem CID	9853707
CompTox Dashboard (EPA)	DTXSID201336882
InChI InChI=1S/4CHF3O3S.Hf/c4*2-1(3,4)8(5,6)7;/h4*(H,5,6,7);/q;;;;+4/p-4 Key: BQYMOILRPDTPPJ-UHFFFAOYSA-J
SMILES C(F)(F)(F)S(=O)(=O)[O-].C(F)(F)(F)S(=O)(=O)[O-].C(F)(F)(F)S(=O)(=O)[O-].C(F)(F)(F)S(=O)(=O)[O-].[Hf+4]
Properties
Chemical formula	Hf(OTf)4
Molar mass	774.8 g/mol
Appearance	Colourless solid
Melting point	350 °C (662 °F; 623 K)
Hazards
Occupational safety and health (OHS/OSH):
Main hazards	irritantant
GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H314, H315, H319, H335
Precautionary statements	P261, P264, P271, P280, P302+P352, P304+P340, P305+P351+P338, P312, P321, P332+P313, P337+P313, P362, P403+P233, P405, P501
Flash point	Non-flammable
Safety data sheet (SDS)	[1]
Related compounds
Other anions	Hafnium tetrachloride Hafnium tetrafluoride Hafnium(IV) bromide Hafnium(IV) iodide
Other cations	Titanium(IV) triflate Zirconium(IV) triflate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Y verify (what is YN ?) Infobox references

Hafnium(IV) triflate or hafnium trifluoromethansulfonate is a salt with the formula Hf(OSO₂CF₃)₄, also written as Hf(OTf)₄. Hafnium triflate is used as an impure mixture as a catalyst. Hafnium (IV) has an ionic radius of intermediate range (Al < Ti < Hf < Zr < Sc < Ln) and has an oxophilic hard character typical of group IV metals. This solid is a stronger Lewis acid than its typical precursor hafnium tetrachloride, HfCl₄, because of the strong electron-withdrawing nature of the four triflate groups, which makes it a great Lewis acid and has many uses including as a great catalyst at low Lewis acid loadings for electrophilic aromatic substitution and nucleophilic substitution reactions.^[1]