Proton-Conductive Polyoxometalate Architectures Constructed from Lanthanide-Incorporated Polyoxoniobate Cages.

Two new extended polyoxometalate (POM) architectures based on lanthanide-incorporated polyoxoniobate (Ln-incorporated PONb) cages, namely, H 4 [Cu II (en) 2 ] 4 {K 4 (H 2 O) 2 [Cu II (en) 2 ] 5 [Cu II 5 (trz) 2 (en) 4 (OH) 2 ][Dy 2 Cu II 2 (en) 2 (CO 3 ) 3 (H 2 O) 2 (OH) 3 ][Dy(H 2 O) 4 ][DyNb 23 O 68 (H 2 O) 4 ] 2 }·60H 2 O ( 1 , en = ethylenediamine) and H 20 [Cu II (en) 2 ] 4 {[Cu II (en) 2 ] 4 [Dy 2 (C 2 O 4 )(H 2 O) 4 ] 2 [(Nb 32 (OH) 4 (H 2 O) 3 O 89 ] 2 }·54H 2 O ( 2 ), have been successfully synthesized and structurally characterized, demonstrating a feasible strategy to develop functional POM materials. In addition, the proton conductivity and magnetic behaviors of both 1 and 2 were studied.