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(a) X-ray crystal structure of 9; (b) schematic view of 9. (c) X-ray crystal structure of 10; (d) schematic view of 10. (e) End-on view of crystal structure of 9 showing cluster geometry. (f) End-on view of crystal structure of 10 showing the silver cluster and nonclassical hydrogen bonds to the exterior sulfate. (g) View from within the crystal structure of 10, showing nonclassical hydrogen bonds to the internal sulfate.
