We report an experimental investigation of absorption, fluorescence, and nonlinear absorption in a platinum-ethynyl complex. We have observed strong singlet absorption at 355 nm, and a weaker triplet absorption at 520 nm. Photoluminescence measurements show a fluorescence band at 400 nm and a phosphorescence band at 520 nm, Pump-probe nonlinear absorption measurements confirmed that S-0-->T-1 followed by excited tripler-state absorption corresponds to the dominant excitation path in the region between 513 and 532 nm.