Alkynyl Complexes of High-Valence Clusters. Synthesis and Luminescence Properties of [Mo₆I₈(CCC(O)OMe)₆]^2–, the First Complex with Exclusively Organometallic Outer Ligands in the Family of Octahedral {M₆X₈} Clusters

The reaction of [Mo6I14]2– with methyl propiolate HCCC­(O)­OMe in the presence of Ag+ and Et3N yielded the new luminescent complex [Mo6I8(CCC­(O)­OMe)6]2–, the first fully organometallic complex in the family of octahedral {M6X8} clusters. The cluster was crystallized as tetraphenylphosphonium salt and characterized by X-ray single-crystal diffraction and elemental analyses, mass spectrometry, 13C NMR, UV–vis, and luminescence spectroscopies.