Rocket-Shaped Telluroniobate with Efficient Catalytic Activity in the Transesterification Reaction.

A novel telluroniobate, K 8 Na 6 H 7 {[Co(en) 2 (SO 3 )][Te 4 Nb 24 O 79 ]}·42H 2 O (en = ethylenediamine), has been synthesized through a diffusion strategy. It consists of a heteropolyoxoniobate [B-β-TeNb 9 O 33 ] 17- cluster and isopolyoxoniobate {Nb 7 O 22 } building blocks. In addition, its structure was fully characterized by a series of spectroscopic methods. Furthermore, it exhibits an efficient catalytic performance in the transesterification of ethylene carbonate and methanol to prepare dimethyl carbonate with good catalytic reusability. Also, it demonstrates interesting proton conduction properties, with conductivity achieved at 3.05 × 10 -4 S cm -1 (60 °C, 75% relative humidity).