The lone (ar)ranger: The structure of Cu20Sb35O44Cl37 is divided up into two parts: ionically bonded Cu+–Cl− supertetrahedra (green) and covalently bonded clusters that resemble zeolite β cages. The Sb3+ ions (gray) lie at the vertices of the cages, while their lone pairs of electrons form surfaces that separate the covalent and ionic parts.
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Mayerová et al. (2006) studied this question.
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