Synthesis, characterization, luminescence and nonlinear optical (NLO) properties of truxene-containing platinum(II) alkynyl complexes

A series of luminescent trinuclear platinum(II) alkynyl complexes containing dihydro-5H-diindeno[1,2-a;1′,2′-c]fluorene (truxene) as the core and aryl alkynyl ligands with different electronic properties at the periphery has been successfully synthesized and characterized. The electronic absorption, emission, nanosecond transient absorption and electrochemical properties of these complexes have been reported. These complexes showed long-lived emissions in degassed benzene solution at room temperature, and their emissions have been assigned to originate from triplet states of intraligand (IL) character with some mixing of metal-to-ligand charge-transfer (MLCT) character. The luminescent platinum(II) alkynyl complexes are found to show two-photon absorption (2PA) and two-photon induced luminescence (TPIL) properties, and their two-photon absorption cross-sections have been determined to be 6–51 GM upon excitation at 720 nm.

A series of luminescent trinuclear platinum(II) alkynyl complexes containing dihydro-5H-diindeno[1,2-a;1′,2′-c]fluorene (truxene) as the core and aryl alkynyl ligands with different electronic properties at the periphery has been synthesized and characterized. The electronic absorption, emission, nanosecond transient absorption, electrochemical, two-photon absorption and two-photon induced luminescence properties of them have been reported.Figure optionsDownload as PowerPoint slideResearch highlights
► Luminescent truxene-containing platinum(II) alkynyl complexes has been reported.
► The complexes were found to be emissive with rich vibronic-structured emission bands.
► Their 2PA σ2 values were found to be in the range of 6–51 GM.
► The emissions could be readily tuned by incorporating different alkynyl ligands.