First Organic-Inorganic Hybrid Compounds Formed by Ge-V-O Clusters and Transition Metal Complexes of Aromatic Organic Ligands.

Three compounds based on Ge-V-O clusters were hydrothermally synthesized and characterized by IR, UV-Vis, XRD, ESR, elemental analysis and X-ray crystal structural analysis. Both [Cd(phen)(en)] ₂ [Cd ₂ (phen) ₂ V ₁₂ O ₄₀ Ge ₈ (OH) ₈ (H ₂ O)]∙12.5H ₂ O ( 1 ) and [Cd(DETA)] ₂ [Cd(DETA) ₂ ] _0.5 [Cd ₂ (phen) ₂ V ₁₂ O ₄₁ Ge ₈ (OH) ₇ (0.5H ₂ O)]∙7.5H ₂ O ( 2 ) (1,10-phen = 1,10-phenanthroline, en = ethylenediamine, DETA = diethylenetriamine) are the first Ge-V-O cluster compounds containing aromatic organic ligands. Compound 1 is the first dimer of Ge-V-O clusters, which is linked by a double bridge of two [Cd(phen)(en)] ²⁺ . Compound 2 exhibits an unprecedented 1-D chain structure formed by Ge-V-O clusters and [Cd ₂ (DETA) ₂ ] ⁴⁺ transition metal complexes (TMCs). [Cd(en) ₃ ]{[Cd(η ₂ -en) ₂ ] ₃ [Cd(η ₂ -en)(η ₂ -μ ₂ -en)(η ₂ -en)Cd][Ge ₆ V ₁₅ O ₄₈ (H ₂ O)]}∙5.5H ₂ O ( 3 ) is a novel 3-D structure which is constructed from [Ge ₆ V ₁₅ O ₄₈ (H ₂ O)] ^12- and four different types of TMCs. We also synthesized [Zn ₂ (enMe) ₃ ][Zn(enMe)] ₂ [Zn(enMe) ₂ (H ₂ O)] ₂ [Ge ₆ V ₁₅ O ₄₈ (H ₂ O)]∙3H ₂ O ( 4 ) and [Cd(en) ₂ ] ₂ {H ₈ [Cd(en)] ₂ Ge ₈ V ₁₂ O ₄₈ (H ₂ O)}∙6H ₂ O ( 5 ) (enMe = 1,2-propanediamine), which have been reported previously. In addition, the catalytic properties of these five compounds for styrene epoxidation have been assessed.