16921-96-3 Usage
Chemical Properties
colorless liquid; enthalpy of vaporization 24.7kJ/mol; specific conductivity 10?9ohm· cm [KIR78] [MER06]
Uses
Different sources of media describe the Uses of 16921-96-3 differently. You can refer to the following data:
1. Iodine heptafluoride is used as a fluorinatingagent.
2. Iodine heptafluoride may be prepared by the reaction of fluorine withpotassium iodide:
5I2 + 4HCl + 3Cl2 → 10ICl + 2H2
Dried KI should be used to minimize the formation of IOF5.
Also, IF7 can be prepared by passing fluorine gas through liquid iodinepentafluoride at high temperature (90°C) and then heating the vapors to 270°C to complete the reaction:
2I2 + HIO3 + 2HCl → 2ICl + 3HIO
Health Hazard
Iodine heptafluoride is highly irritating to theskin and mucous membranes. Toxicity dataon this compound are not available.
Fire Hazard
Nonflammable gas. It reacts violently with
ammonium halides (chloride, bromide, or
iodide) and with organic matter (Mellor
1946, Suppl. 1956). It burns with carbon
monoxide.
Check Digit Verification of cas no
The CAS Registry Mumber 16921-96-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,6,9,2 and 1 respectively; the second part has 2 digits, 9 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 16921-96:
(7*1)+(6*6)+(5*9)+(4*2)+(3*1)+(2*9)+(1*6)=123
123 % 10 = 3
So 16921-96-3 is a valid CAS Registry Number.
InChI:InChI=1/F7I/c1-8(2,3,4,5,6)7
16921-96-3Relevant articles and documents
Time-of-flight neutron diffraction study on the low temperature phases of IF7
Marx, R.,Mahjoub, A. R.,Seppelt, K.,Ibberson, R. M.
, p. 585 - 593 (1994)
A neutron diffraction study on iodine heptafluorine has been performed using the high resolution powder diffractometer (HRPD) at the spallation source ISIS, England.The previously unknown structure of the low temperature phase IF7 (III) was solved.IF7 (III) crystallizes in the orthorhombic space group Pbab (No. 54), a=852.160(4) pm, b=884.096(4) pm, c=599.089(2) pm with 4 formula units per unit cell.The IF7 molecule is found to exhibit an almost perfect pentagonal bipyramid with an axial bond length of 179.5(2) pm and an average equatorial bond length of 184.9 pm.The I(Feq)5 unit is slightly puckered with puckering displacements of 2.7o for two of the five Feq atoms leading to a c2 symmetry for the molecule.Two order-disorder processes lead from the plastic phase IF7 (I) to the ordered phase IF7 (III).At the first phase transition at 150 K IF7 molecules align with respect to their Fax-I-Fax units.Within the second transition at 100 K they order with respect to their I(Feq)5 units.The latter can be grouped into two sets of five-membered rings with vertices pointing up and down the orthorhombic c axis, respectively.There is evidence suggesting a temperature dependence to this second ordering process; the amount of residual disorder is 5percent at 77 K and 1.4percent at 5 K.
