Copper(I) cyanide: a simple compound with a complicated structure and surprising room-temperature reactivity.
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Biomedical subjects
Sharon G Eversfield
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CuCN: a polymorphic material. Structure of one form determined from total neutron diffraction.
CuCN has been found to be polymorphic. The structure of one form, which is isomorphous with AgCN, has been determined using the information provided by Bragg and diffuse neutron scattering. The polymorph of CuCN formed has been found to depend on the Cu/CN ratio used in its preparation.
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Beyond Bragg scattering: the structure of AgCN determined from total neutron diffraction.
Total neutron diffraction has yielded accurate bond lengths, Ag-C = Ag-N = 2.06 A and C-N = 1.16 A, for the disordered crystalline solid AgCN. This information cannot be obtained from analysis of Bragg scattering studies, because the (-Ag-CN-)(n) chains are randomly displaced along the chain axis relative to each other by a root-mean-square displacement of 0.24 A at 10 K. These results show the power of total neutron diffraction for determining structure in disordered systems.
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