A New Hexa-Ti-IV-Substituted Sandwich-Type Polyoxotungstate: Hydrothermal Synthesis, Structure, and Oxidative Decontamination of Chemical Warfare Agent Simulant

摘要

A new hexa-Ti-IV-substituted sandwich-type silicotungstate, Na-2(H(2)enMe)(4)[Ti-6(mu-O)(9)(A-alpha-SiW9O34H2)(2)]center dot 16H(2)O (1, enMe = 1,2-diaminopropane) has been synthesized under mild hydrothermal conditions and characterized by FT-IR spectroscopy, elemental analysis, thermogravimetric analysis, single-crystal and powder X-ray diffraction. Compound 1 contains a dimeric polyoxoanion with two [A-alpha-SiW9O34](10-) Keggin moieties sandwiching a trigonal-prismatic [Ti-6(mu-O-9)](6+) cluster. The catalytic performance of 1 was evaluated for the oxidative decontamination of chemical warfare agent, i.e. sulfur mustard simulant, 2-chloroethyl ethyl sulfide (CEES), using H2O2 under ambient conditions, showing that 1 is an excellent catalyst for the rapid and complete transformation from CEES to nontoxic 2-chloroethyl ethyl sulfoxide (CEESO) with 100 % selectivity. In addition, 1 exhibits good stability and recyclability.