Rd. Hunt et al., MATRIX IR-SPECTRA OF THE PRODUCTS FROM F2, CIF, AND CL-2 REACTIONS WITH PULSED-LASER EVAPORATED URANIUM ATOMS, Inorganic chemistry, 33(2), 1994, pp. 388-391
Pulsed Nd:YAG laser ablated uranium atoms were codeposited with F-2 an
d excess Ar onto a CsI window at 12 K. Infrared spectra revealed the p
resence of several uranium fluorides including the previously characte
rized UF4, UF5, and UF6. Lower laser energy favored new:absorptions at
400, 446, 496, and 561 cm(-1). These product absorptions increased st
epwise during annealings which permitted diffusion and reaction of the
fluorine. Similar studies with ClF produced the above absorptions plu
s a new band at 554 cm(-1) which is tentatively assigned to ClF2-. The
first bands appearing at 400 and 446 cm(-1) are assigned to UF and UF
2, respectively. The 496- and 561-cm(-1) bands are tentatively assigne
d to UF3 and F-3(-) respectively. Finally, uranium atoms were reacted
with Cl-2. In addition to several absorptions due to UCl4, a new doubl
et at 312 and 308 cm(-1) is assigned to UCl2.