Synthesis, Characterization, Luminescence, and Non-linear Optical Properties of Oxadiazole- and Truxene-Containing Platinum(II) Alkynyl Complexes with Donor−Acceptor Functionalities

Abstract

A series of luminescent platinum(II) alkynyl complexes containing 2,5-diphenyl-1,3,4-oxadiazole (oxa-2,5) and 10,15-dihydro-5H-diindeno[1,2-a;1',2'-c]fluorene (truxene) as the cores and different electron donors at the periphery has been synthesized and characterized. These complexes showed long-lived emissions in both solution and in the solid state at room temperature and have been found to exhibit two-photon absorption (2PA) and two-photon induced luminescence. Their 2PA cross-sections (sigma(2)) have also been determined.

Revisiting the classification of NIR-absorbing/emitting nanomaterials for in vivo bioapplications

“…200 Recently, Tian and co-workers synthesized a novel analogous cis-platinum complex (TDPt) with strong TPA properties. 201 This complex material could be used as a dualfunctional agent in imaging and as a chemical drug.…”

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

“…2-(4-Ethynylphenyl)-5-phenyl-1,3,4-oxadiazole [81] and [{Cl (PEt 3 ) 2 PtC^C} 3 -truxene [70] were synthesized according to literature procedures. Triethynylhexabutyltruxene [82] and trans-[MeOC 6 H 4 C^C(PPh 3 ) 2 PtCl] [83] were prepared according to slight modification of reported procedures.…”

“…For the power dependence measurements, the laser beam power was altered by using two polarizers, which was partially reflected to a photodiode for the monitoring of the excitation power. The schematic diagram for the experimental setup has been described elsewhere [70]. Transient absorption measurements were performed on an LP920-KS Laser Flash Photolysis Spectrometer (Edinburgh Instruments Ltd, Livingston, UK) at room temperature.…”

“…This was synthesized according to modification of a literature procedure for the related platinum(II) phosphine alkynyl complexes [70,77]. [{Cl(PEt 3 ) 2 PtC^C} 3 truxene] (0.12 g, 0.10 mmol) and 1-ethynyl-4-methoxybenzene (0.05 g, 0.40 mmol) were dissolved in a mixture of THF (20 mL) and triethylamine (10 mL).…”

“…Various platinum complexes, oligomers and metallopolymers with different spacers and chain lengths have been reported by Lewis et al [46,47] , and some of them have proven to be versatile and promising building blocks for the development of multinuclear luminescent complexes [52,64e68]. The incorporation of platinum(II) alkynyl complexes and polymers has attracted attention in the fields of nonlinear optics, such as optical limiting, two-photon absorption and twophoton induced luminescence [37,39,42,58,69,70]. Therefore, the study of nonlinear optical platinum(II) alkynyl polymers and molecular materials has received much attention, but most of these complexes are mononuclear and are structurally related to the (4-phenylethynyl)phenylethynyl backbone [38,39,42,43].…”