A novel polyoxotungstate [CoW(11)O(39)(CpTi)](7-) (Cp=eta(5)-C(5)H(5)) has been prepared. This complex exhibits the highest antitumor activity in vitro among the cyclopentadienyltitanium substituted polyoxometalates investigated and has a remarkable inhibitory action on three types of human cancer cells, SSMC-7721, HL-60 and HLC, in vivo.
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