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SOME EFFECTS OF SUCCESSIVE FLUORINATION ON 1-IODOPROPANE

Please use this identifier to cite or link to this item: http://hdl.handle.net/1811/38000

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Title: SOME EFFECTS OF SUCCESSIVE FLUORINATION ON 1-IODOPROPANE
Creators: Grubbs, Garry S., II; Dewberry, Christopher T.; Cooke, Stephen A.
Issue Date: 2009
Abstract: Fourier transform radiofrequency and microwave spectroscopies have been used to record the pure rotational spectra of 1-iodo-3,3,3-trifluoropropane (I3FP) and 1-iodo-2,2,3,3,3-pentafluoropropane (I5FP). In both cases the compound of interest was seeded in a supersonic expansion of argon gas issued from a pulsed solenoid valve. Several hundred transitions have been recorded for both species. Using the same instrumentation we have also remeasured several rotational transitions for 1-iodopropane for which $gauche$ and $trans$ conformers are visible; previous workers have shown that the $gauche$ conformer of 1-iodopropane is the most stable. The substitution of three fluorines for the hydrogens on C$_3$ of 1-iodopropane has the effect of locking the CCCI dihedral angle into the $trans$ conformer for the fluorinated species in our experiments. Further observations have shown that the largest component of the dipole moment lies along the $a$-axis for $trans$-1-iodopropane, but lies along the $b$-axis for $trans$-I5FP, switching back along the $a$-axis for $trans$-I3FP (but presumeably in the opposite direction than in 1-iodopropane). Spectroscopic constants will be presented and discussed.
URI: http://hdl.handle.net/1811/38000
Other Identifiers: 2009-MH-06
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