Square-planar complexes self-quenching

The first example of such a complex was reported by Che in 1994, who attributed the broad, structureless, room temperature emission band of Pt(phen)(-C=C-Ph)2 to a Pt(d)-7r (phen) 3MLCT excited state (Aem = 578 nm, r = 2.1 xs in CH2CI2) [25]. Eisenberg et al. later examined this complex and the 4-tolyl-acetylide and 4-huorophenyl-acetylide analogues as part of a study of the concentration-dependent self-quenching of square planar Pt(II) complexes [26]. They noted that, in CH2CI2, the self-quenching of... 

---