Synthesis, characteristics conductivity of heteropoly compound Na6[MnMn(OH2)W11O39] · 16H2O

Figure 1 shows characteristic peaks of the sample in the range of 400-4000 cm−1. These peaks can be assigned to νas(W = Od) 945 cm−1, νas(W-Ob-W) 889 cm−1, νas(W-Oc-W) 765 cm−1, 617 cm−1, νas(Oa-Mn-Oa) 412 cm−1 and νas(Mn-Oa) 573 cm−1, respectively. These datas indicate that the compound anions have the Keggin cage structure[9-10]. We can see the sample has two obvious absorption peaks in 3448 cm−1 and 1637 cm−1, they are treated as the stretching vibration of O-H bonds and the bending vibration of H-O-H bonds, respectively[11,12], these results can illustrate that the sample has water molecules existing.