The reaction of [VO(salen)] with controlled quantities of species able to extract the oxygen atom, such as trityl fluoroborate or fluoroboric acid–diethyl ether (1/1) leads to the novel tetranuclear cation [{V(salen)}4(µ-O)3]2+, which contains a linear vanadium–oxygen chain.
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Hills et al. (1991) studied this question.
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