Vibrational spectra of sulfito and hydrogensulfito complexes of iridium

For the diaquadichlorodisulfitoiridates(III) M-3[IrCl2(SO3)(2)(OH2)(2)]. nH (2)O(M = Na, n = 7(1); hi = K, n = 2(2)) some findings in vibrational spect ra at ambient and low temperatures and estimated force constants f(IrO) and f(IrCl) are correlated with data from X-ray structure analyses. In the spe ctra of dichlorobis(hydrogendisulfito)iridates(III) trans-M-5[IrCl2{(SO3H)( SO3)}(2)]. nH(2)O(M = Na, n = 10(3); M = K, n = 5(4)) the consequences of t he short intramolecular hydrogen bonds for the valence vibrations of the su lfate ligands are discussed. From the vibrations of the O-H ... O systems o nly the delta mode could be identified. (C) 1999 Elsevier Science B.V. All rights reserved.