Abstract
Sodium hexakis(chlorosulphato)iridate, Na2Ir(SO3Cl)6 and sodium tetrakis(chlomsulphato)palladate, Na2Pd(SO3Cl)4, have been synthesized by solvolytic reactions of the corresponding chlorides with chlorosulphuric acid. A positive shift in the sym. SO3 stretching mode γ1(A) and the splitting of the E modes of the free SO3Cl− ion (C3v) indicate a Cs symmetry of the SO3Cl− group such that each SO3Cl− group is covalently bonded to the central metal atom through one of the oxygen of this group. The bands obtained in the reflectance spectra and the values of magnetic moments suggest an octahedral and a square planer geometry for hexakis-(chlorosu1phato)iridate and tetrakis(chlorosulphato)palladate, respectively.