Synthesis and photophysical properties of two Platinum(II) diimine diacetylides – A new approach for fluorescent two-photon absorption materials from organometallics

Two new arylalkyne ligands L1 (D–π–D′ type) and L2 (D–π–A type), and their coordinated Platinum(II) diimine diacetylides 1 (D–π–D′–π–[Pt]–π–D′–π–D type) and 2 (D–π–A–π–[Pt]–π–A–π–D type) were designed and synthesized (where D represents electron donating group and A represents electron accepting group). Photophysical properties measurements indicated that 2 displayed orange-red fluorescence with relatively high fluorescence quantum yield and strong two-photon absorption (2PA) cross-section. The influence of metal on the electronic structure and property was investigated by theoretical calculations and cyclic voltammograms.