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.