mer-Tri-chlorido-tris-(tetra-hydro-thio-phene-?S)iridium(III): preparation and comparison with other mer-tri-chlorido-tris-(tetra-hydro-thio-phene-?S)metal complexes.

ABSTRACT: The title complex, [IrCl₃(C₄H₈S)₃], was prepared according to a literature method. A suitable crystal was obtained by diffusion of pentane into a di-chloro-methane solution and analyzed by single-crystal X-ray diffraction at 100?K. The title complex is isotypic with mer-tri-chlorido-tris-(tetra-hydro-thio-phene-?S)rhodium(III). However, the orientation of the tetra-hydro-thio-phene rings is different from an earlier report of mer-tri-chlorido-tris-(tetra-hydro-thio-phene-?S)iridium(III) deposited in the Cambridge Structural Database. The IrS₃Cl₃ core shows a nearly octa-hedral structure with various bond angles within 1-2° of the perfect 90 or 180° expected for an octa-hedron. The structure of the title compound is compared with the previous iridium complex as well as the rhodium and other octa-hedral metal tris-tetra-hydro-thio-phene compounds previously structurally characterized. DFT calculations were performed, which indicate the mer isomer is significantly lower in energy than the fac isomer by 50.1?kJ?mol^-1, thereby accounting for all compounds in the CSD being of the mer geometry. Powder X-ray diffraction of the bulk material showed that the preparation method yielded only the isomorph reported in this communication.

SUBMITTER: Brown LC 

PROVIDER: S-EPMC5120713 | biostudies-literature | 2016 Sep

REPOSITORIES: biostudies-literature