Cs<sub>2</sub>Pd<sub>3</sub>(P<sub>2</sub>O<sub>7</sub>)<sub>2</sub> and Cs<sub>2</sub>Pd<sub>3</sub>(As<sub>2</sub>O<sub>7</sub>)<sub>2</sub>: A 3D Palladium Phosphate with a Tunnel Structure and a 2D Palladium Arsenate Containing Strings of Palladium Atoms
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Cs2Pd3(P2O7)2 (1) and Cs2Pd3(As2O7)2 (2) have been synthesized by molten flux reactions and characterized by single-crystal X-ray diffraction. The structure of 1 consists of discrete PdIIO4 squares which are linked by P2O7 groups via corner-sharing to generate a 3D framework containing 12-ring channels in which Cs+ cations are located. Compound 2 adopts a 2D layer structure with the interlayer space filled with Cs+ cations. Within a layer there are PdO4 squares and As2O7 groups fused together via corner-sharing. Adjacent layers are stacked such that strings of Pd atoms are formed. The PdO4 squares show eclipsed and staggered stacks with alternate short and long Pd···Pd distances. The two compounds adopt considerably different structures although they have the same general formula: Cs2Pd3(X2O7)2. Compound 2 is the first palladium arsenate reported. Crystal data for 1: orthorhombic, space group Cmc21 (No. 36), a = 7.6061(4) Å, b = 14.2820(7) Å, c = 14.1840(7) Å, and Z = 4. Crystal data for 2: tetragonal, space group P4/n (No. 85), a = 16.251(1) Å, c = 5.9681(5) Å, and Z = 4.
