Structural stability index of heteropoly- and isopoly-anions—II

The structural stability indexes of some previously unreported heteropoly- and isopoly-compounds are discussed. Compounds studied here are mono-substituted Keggin and Dawson heteropolyanions with the general formulas XZ(H₂O)M₁₁O₃₉]^n? and X₂Z(H₂O)M₁₇O₆₁]^n? (X is a heteroatom; Z is a substituted metal ion; M is Mo, or W), two Finke-type heteropolyanions with the formulas P₂W₁₈Z₄(H₂O)₂O₆₈]^10? and P₄W₃₀Z₄(H₂O)₂O₁₁₂]^16? (Z = Co(II), Cu(II), Zn(II)), heteropolyvanadates containing high valence heteroatoms XV₁₃O₃₈]^7? (X = Mn(IV), Ni(IV)), isopolyvanadate V₁₀O₂₈]^6?, some heteropolyvanadates with capped-Keggin structures, and As₄W₄₀O₁₄₀]^28? as an inorganic cryptate. An additional rule concerning the conversion between the heteropoly- and isopoly-anions is proposed as the fourth rule. The actual stability of heteropolyanions with the small structural index is interpreted by the presence of a significant contribution from the heteroatom or other supporting metal ions.