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. 2019 Sep 20;24(19):3425. doi: 10.3390/molecules24193425

Figure 1.

Figure 1

The structure of Keggin-type polyoxometalates (POMs), taking PW12O403− as an example, identifying the four types of oxygen in the structure: the central oxygen atom (Oa); the bridging oxygen atom that bridges two tungsten atoms not sharing a central oxygen atom (corner-sharing, Ob); the bridging oxygen atom that bridges two tungsten atoms sharing a central oxygen atom (edge-sharing, Oc) and the terminal oxygen atom (Od). P, pink ball; W, blue ball; O, red ball. Reproduced with permission from [20]. Copyright (2003) Elsevier.