Cs2PdI6. Which atom is oxidized and which atom is reduced? The high-pressure phase (Cs2PdI6) is a close-packed structure (face-centered cubic); which ion establishes the lattice packing and which atom fills holes? Why?Final Exam
December 21, 2000
4. B. Schüpp, P. Heines, A. Savin, and H.-L. Keller (p. 732-735) studied the pressure induced redox reaction: Cs2PdI4–I2Cs2PdI6. Which atom is oxidized and which atom is reduced? The high-pressure phase (Cs2PdI6) is a close-packed structure (face-centered cubic); which ion establishes the lattice packing and which atom fills holes? Why?
Answer:
Cs+2Pd2+I –4–I02
The Pd atom is oxidized and the solvated I atom is reduced.
The octahedral complex PdI62– is large and spherical, so should be expected to form the lattice. The smaller Cs+ ion fills holes.