Synthesis And Catalytic Activity Of Sandwich-type Tungstogermanate Functionalized By Carboxyltin/Transition Metal

Using estertin (Cl3SnR, R=CH2CH2COOCH3/CH2CH(CH3)COOCH3) as an organicprecursor, tungstogermanate with sandwich-type transition metal complexesNa12[(TM)4(H2O)2(GeW9O34)2]·nH2O (TM=Cu、Zn、Cd、Co) as an inorganic precursor,seven polyoxometalates (POMs) with sandwich-type functionalized by carboxyltin/transitionmetal have successfully assembled in aqueous solution. They were characterized by Singlecrystal X-ray diffraction analysis for compounds1-7. The electrocatalytic activities towardthe reduction of H2O2for compounds1-4were studied, and the catalytic activities for theoxidation of cyclohexanol to cyclohexanone and the acid-catalyzed synthesis ofcyclohexanone ethylene ketal were also researched.In the skeletons of senven compounds, they all contain two [GeW9O34]10-subunits(abbreviated as {GeW9}) in each sandwich type structure, and two organic metal (OM)groups and two TM2+ions located in the center of the structure are sandwiched by two {GeW9}moieties, and the isolated organic cation {C(NH2)3]+cations are outside the polyoxoanions:{C(NH2)3}10H2[Cu2{Sn(C3H4O2)}2(B-α-GeW9O34)2]·8H2O (1){C(NH2)3}6H6[Cu2{Sn(C4H6O2)}2(B-α-GeW9O34)2]·14H2O (2){C(NH2)3}10H2[Zn2{Sn(C3H4O2)}2(B-α-GeW9O34)2]·8H2O (3){C(NH2)3}8H4[Zn2{Sn(C4H6O2)}2(B-α-GeW9O34)2]·12H2O (4){C(NH2)3}10H2[Cd2{Sn(C3H4O2)}2(B-α-GeW9O34)2]·6H2O (5){C(NH2)3}10H2[Cd2{Sn(C4H6O2)}2(B-α-GeW9O34)2]·7H2O (6){C(NH2)3}10H2[Co2{Sn(C3H4O2)}2(B-α-GeW9O34)2]·9H2O (7)...