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| type | general formula | terms |
|---|---|---|
| type I | Cat+X–zMClx | M = Zn,1,5,6 Sn,7 Fe, Al,8 Ga,9 In10 |
| type II | Cat+X–zMClx·yH2O | M = Cr11 Co, Cu, Ni, Fe |
| type III | Cat+X–zRZ | Z = CONH,12 COOH,13 OH14 |
| type IV | MClx + RZ = MClx–1 + •RZ + MClx+1– | M = Al, Zn and Z = CONH2, OH |
