Mixed-metal cluster chemistry. 37. Syntheses, structural, spectroscopic, electrochemical, and optical power limiting studies of tetranuclear molybdenum-iridium clusters

Tetrahedral molybdenum-iridium cluster afford mono-substitution products in fair to good yields and react with alkynes by insertion into M-M bonds. Open-aperture Z-scan studies revealed that these clusters are optical limiters at wavelengths in the visible region.190