Related Experiment Video
Updated: May 22, 2026

Synthesis of a Thiol Building Block for the Crystallization of a Semiconducting Gyroidal Metal-sulfur Framework
Published on: April 9, 2018
Pentadecatungstotrivanadodiphosphoric heteropoly acid with Dawson structure: Synthesis, conductivity and conductive
Xia Tong1, Xuefei Wu, Qingyin Wu
1Department of Chemistry, Zhejiang University, Hangzhou 310027, PR China.
Abstract:
A general strategy in terms of degradating and ion-exchange synthesis was used to design pentadecatungstotrivanadodiphosphoric heteropoly acid H(9)P(2)W(15)V(3)O(62)·28H(2)O with Dawson structure and excellent conductivity. The product was characterized by ICP-MS, IR, UV, XRD, (31)P NMR, TG-DTA and electrochemical impedance spectroscopy (EIS). The results indicate that H(9)P(2)W(15)V(3)O(62)·28H(2)O possesses the Dawson structure. EIS measurements show a high conductivity (3.64 × 10(-2) S cm(-1) at 26 °C and 75% relative humidity), with an activation energy of 31.34 kJ mol(-1) for proton conduction. Its mechanism for proton conduction is the Vehicle mechanism.
Related Concept Videos
Valence Bond Theory
EDTA: Chemistry and Properties
Theory of Strong Electrolytes
Electrical Transport
Ionic Association
Crystal Field Theory - Tetrahedral and Square Planar Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...

