A novel tellurium‐containing polyoxoniobate, H 18 K 20 Nb 13 O 42 (Te 4 Nb 9 O 33) 4 ·50H 2 O (1), was synthesized using TeO 3 2 − as a template agent. The structure consists of a new 13‐metal core basic building unit Nb 13, which differs from the classical Keggin‐type and Silverton‐type XM 12 unit. Four Te 4 Nb 9 units further encapsulate the central Nb 13 core, forming a unique core–shell tetrahedron, consistent with the morphology of macroscopic crystals. The compound 1 demonstrates excellent proton conductivity, reaching 1. 1 × 10 −2 S·cm −1 at 85°C and 98% relative humidity, highlighting its potential as a high‐performance proton‐conducting material.
Jia et al. (Fri,) studied this question.