Consider the MODEL cluster drawn below: a central octahedral Cr(III) is connected to three outer octahedral Cr(III) centres. Each central−outer pair is joined by two μ-OH bridges; each outer metal als

Question

Consider the MODEL cluster drawn below: a central octahedral Cr(III) is connected to three outer octahedral Cr(III) centres. Each central−outer pair is joined by two μ-OH bridges; each outer metal also binds four NH₃. It has the same donor-connectivity topology as a tris-bidentate octahedron. Ignore proton orientation and other conformations.

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There are four Cr³⁺ ions and six OH⁻ bridges: charge = 12−6 = +6. Each bridge makes two metal−O bonds, hence twelve. The central Cr sees three pairs of bridging donors, giving tris-chelate-like handedness. Each outer metal has two bridge-O donors plus four ammines; the central metal has six O donors and no ammines.

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