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Single crystals of AgKCu 3 Mo 4 O 16  have been prepared by crystallization from melts and investigated by X-ray diffractometer techniques. This compound crystallizes with monoclinic symmetry, space group C 2h  5  - P2 1 /c, a = 5.056(1), b = 14.546(4), c = 19.858(9) Å, β = 86.64(5)°, Z = 4. The crystal structure of AgKCu 3 Mo 4 O 16  is closely related to K 2 Cu 3 Mo 4 O 16  showing ribbons of edge-sharing CuO 6  and AgO 7  polyhedra. The ribbons are linked by tetrahedrally coordinated molybdenum and K 2 O 10  groups. Another kind of MoO 4  tetrahedra occupies the cavities inside the ribbons. The crystal structure and the coordination of silver, copper, potassium and molybdenum by oxygen are discussed with respect to K 2 Cu 3 Mo 4 O 16 .

zeitschrift für naturforschung b

Über das Oxomolybdat AgKCu 3 Mo 4 O 16  mit Silber in siebenfacher Koordination / About the Oxomolybdate AgKCu 3 Mo 4 O 16  with Silver in Seven-Fold Coordination