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Single crystals of the so far unknown compounds KCuGd 2 Mo 4 O 16  (I) and KCuTb 2 Mo 4 O 16  (II) have been prepared by flux technique. The compounds crystallize with monoclinic symmetry. space group C 6  2h -C2 /c with (I): a = 5.278(2), b = 12.666(5), c = 19.604(14) Å; β = 92.76(6)°; (II): a = 5.259(13), b = 12.616(3), c = 19.556(9) Å, β = 92.93(4)°, Z = 4. Molybdenum exhibits tetrahedral coordination. The surroundings of copper can be described by distorted tetrahedra, capped by two more distant oxygen atoms, and the rare earth ions show a square antiprism. Potassium is inside an irregular polyhedron. The relationship of the structures of (I) and (II) is discussed with respect to the KLnMo 2 O 8  type compounds. Coulomb term calculations of the lattice energy indicate an oxidation state of copper higher than Cu I .

zeitschrift für naturforschung b

Synthese und Röntgenstrukturanalyse von KCuGd 2 Mo 4 O 16  und KCuTb 2 Mo 4 O 16 /Synthesis and X-Ray Analysis of KCuGd 2 Mo 4 O 16  and KCuTb 2 Mo 4 O 16