Journal article

Synthesis and redox properties of triarylmethane dye cation salts of anions [M6O19](2-) (M = Mo, W)

Si-Xuan Guo, Jingli Xie, Ryan Gilbert-Wilson, Stephen L Birkett, Alan M Bond, Anthony G Wedd

DALTON TRANSACTIONS | ROYAL SOC CHEMISTRY | Published : 2011

Abstract

Four salts have been isolated combining the triarylmethane dye cations pararosaniline (PR(+)) and crystal violet (CV(+)) with the hexametalates [M(6)O(19)](2-) (M = Mo, W). A new hexatungstic acid H(2)[W(6)O(19)]·4dma (dma = dimethylacetamide) was isolated and is a useful synthon for hexatungstate salts. Single-crystal X-ray diffraction confirmed the presence of PR(+) and [Mo(6)O(19)](2-) ions in [PR](2)[Mo(6)O(19)]·6dmf (dmf = dimethylformamide). A number of charge-assisted hydrogen bonds N-H···O exist between the cation -NH(2) functions and the anion oxygen atoms. Comparative cyclic voltammetry of salts [A]Cl (A = PR, CV), [Bu(4)N](2)[M(6)O(19)](2-) and A(2)[M(6)O(19)] was established in M..

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