Platinum σ–acetylide complexes (commonly referred to as platinum acetylides) are π–electron conjugated molecules with platinum(II) bonded to two ethynyl groups typically in the trans configuration along with two phosphorus, nitrogen, or arsine containing ligands, Figure 1. 1 Platinum acetylides have shown interesting photophysical properties such as two-photon absorption and nonlinear optical effects. 2 As part of a project to identify new materials for optical power limiting ...