Question

Question Three Compounds containing the cubic-shaped cluster Cus can be synthesized. Using group theory, determine the symmetry of the Cu-Cu bond stretches and indicate how many modes are infra-red active and/or Raman active. Hint-follow how bonds move or do not move under the symmetry operations of the group)

Answer 1

SOLUTION:

The Cu-Cu bonding interaction in the binuclear complex is modulated both in the solid state and in solution by the ligand environment through coupling to ligand torsional modes that stabilized by hydrogen bonding. Electroabsorption data on the three major visible and near-infrared electronic transitions of Cu2L, 1000 nm ( 1200 M-1 cm-1), 748 nm (5600 M-1 cm-1), and 622 nm (3350 M-1 cm-1), reveal a difference dipole moment between the ground and excited states because of symmetry breaking.