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Reported here is an extraordinary and unprecedented sulfide containing icosahedral Cu8S1216- clusters that behave like a pseudo-octahedral unit in the bonding pattern and are linked through two monomeric GeS4(4-) and four dimeric Ge2S6(4-) units into a covalent 3-D open framework. Its large Cu to Ge ratio is highly unusual in 3-D open-framework sulfides and contributes to its low electronic band gap and the visible light photocatalytic activity.
Zhang et al. (Thu,) studied this question.