Synthesis and Characterization of Metal Tribromoacetates and Their Alkali Metal Derivatives

Table 5

Infrared spectral bands (cm⁻¹) of M[Fe(CBr₃COO)₄], where M = Me₄N⁺, K⁺, Rb⁺ and Cs⁺.

[Me4N][Fe(CBr3COO)4]	K[Fe(CBr3COO)4]	Rb[Fe(CBr3COO)4]	Cs[Fe(CBr3COO)4]	Assignments
1650 sh	1700 sh	1680 s	1670 sh	COO asym.str.
1580 s	1655 s	1655 s	1655 s
1475 sh	1410	1410	1440 sh	COO sym.str.
1400 sh	1400 sh	1400 sh	1420 sh
1200 b	1205	1200 m	1195 sh	CBr3 str.
1150 b	1150 m	1150 m	1150 m	CBr3 str.
885 vw	890 vw	895 vw	—
830 s	850 s	845 s	850 s	C–C str.
840 s	—	—	840 s
785 s	785 s	785 s	790 s
720 s	720 s	720 s	720 s	OCO deform
655 w	655 w	650 w	660 w	CBr3 bend
595 s	595 s	595 w	595 w	CBr3 bend
510 s	510 s	520	510 w	CBr3 bend
470 s	465 sh	470 s	475 s	CBr3 bend
370 w	370 w	365 w	370 w	M–O
1475 s	—	—	—	Band due to Me4N
945 s	—	—	—

sh: shoulder, b: broad, m: medium, v: sharp, w: weak, vw: very weak.