A simple synthetic route to polyoxovanadate-based organic–inorganic hybrids using EEDQ as an ester coupling agent

Abstract

A reaction strategy for the post-functionalization of hexavanadate derivatives is presented herein. In this study, five polyoxovanadate-based organic–inorganic hybrids TBA₂[V₆O₁₃{(OCH₂)₃CCOO(CH₂)₁₅CH₃}₂] (2), TBA₂[V₆O₁₃{(OCH₂)₃CCOO(CH₂)₈CHCH₂}₂] (3), TBA₂[V₆O₁₃{(OCH₂)₃CCOOCH₂CF₃}₂] (4), TBA₂[V₆O₁₃{(OCH₂)₃CCOO(CH₂CH₂O)₃CH₃}₂] (5), and TBA₂[V₆O₁₃{(OCH₂)₃CCOO(CH₂)₁₂OH}₂]·2CH₃CH₂OH (6) were successfully synthesized via esterification of carboxylic acid groups-containing TBA₂[V₆O₁₃{(OCH₂)₃CCOOH}₂] (1) with five alcohols possessing different functional groups. These hybrids were characterized by single crystal X-ray diffraction, IR, ESI-MS, ¹H and ¹³C-NMR spectroscopies, and elemental analysis. Moreover, the formation of large vesicles was observed in a mixed solution of compound 2 due to its surfactant-like structure.