Bonding in cis- and trans-dichlorobis(dimethylsulfide)platinum(II) studied by vibrational (micro)spectroscopy and...

The vibrational spectra of the square-planar complexes cis- and trans-dichlorobis(dimethylsulfide)platinum(II) have been investigated using Raman and synchrotron infrared microscopy of small samples, and mid- to far-infrared spectroscopy of macroscopic samples. Synthesis of the compounds produces the cis- and trans-stereoisomers. Using microscopy we were able to identify single crystals of the trans isomer and amorphous regions containing both cis and trans isomers. The infrared and Raman data are interpreted using force field calculations. Spectral shifts are discussed in terms of influence of the cis- and trans-ligands. It is found that vibrational spectroscopy is a sensitive technique for measuring subtle chemical effects in transition metal complexes which complements and may improve studies made with X-ray crystallography.