Table 1 Representation of important absorption bands (cm-1) for K15[Ln(BW11O39)2] (Ln = La, Ce, Nd, Sm, Gd, and Er) and naked [BW11O39]9− for comparison.
Compound | νas(B–Oa) | νs(B–Oa) | ν(W–Oa) | νas(W–Ot) | νas(W–Ob) and νas(W–Oc) |
|---|---|---|---|---|---|
La-B2W22 | 997 | 521 | 887 | 948 | 832, 777 |
Ce-B2W22 | 996 | 522 | 887 | 947 | 831, 777 |
Nd-B2W22 | 996 | 520 | 885 | 948 | 832, 777 |
Sm-B2W22 | 1000 | 519 | 884 | 949 | 831, 778 |
Gd-B2W22 | 1000 | 517 | 883 | 948 | 832, 779 |
Er-B2W22 | 997 | 522 | 886 | 948 | 835, 780 |
Naked BW11 | 995 | 515 | 889 | 954 | 836, 753 |
