1,3,5-Triazine-Based Pt(II) Metallogel Material: Synthesis, Photophysical Properties, and Optical Power-Limiting Performance

Abstract

A new Pt­(II) acetylide metallogel material (Pt-1) with 1,3,5-triazine core and 3,4,5-tris­(dodecyloxy)­benzamide terminal units was synthesized and characterized. Its photophysical properties were studied by UV–vis absorption, emission, transient absorption, Z-scan, and nonlinear transmission spectroscopy/technique. Pt-1 exhibits ligand-centered n−π* and 1π–π* transitions in the UV region, and broad, strong absorption bands mixed with intraligand charge transfer (1ILCT)/ligand-to-ligand charge transfer (1LLCT)/metal-to-ligand charge transfer (1MLCT) in the visible spectral region (forward slashes expression indicates that all three processes can be involved, in any proportion). Meanwhile, it shows much stronger triplet transient absorption from the visible to near-infrared region. Thus, the optical power-limiting (OPL) performance of Pt-1 was demonstrated in solution and gel state for a 532 nm nanosecond laser pulse, both of which exhibit a significant decrease of output energy density when the incident light energy increases. In addition, the gel properties of Pt-1 in 15 solvents were studied and a gel sheet with good optical transparency was obtained after cooling the heating sols in dimethylformamide solution. This study can open a new outlet for OPL gelation materials and devices on the basis of the reverse saturable absorption mechanism.

Record Aluminum Molecular Rings for Optical Limiting and Nonlinear Optics

“…To minimize their impact on sensitive human eyes and optical devices, optical‐limiting (OL) materials with high transmission and decreasing transmission of progressively increasing light intensities have received considerable attention [3] . Typical OL materials contain carbon‐based materials (including carbon black, carbon nanotubes, fullerenes and graphene), [4] organic dyes and polymers (such as phthalocyanine and porphyrin), [5, 6] inorganic metal nanoparticle and quantum dots, [7–9] as well as organic and inorganic hybrid materials [10–16] . Hybrid materials possessing flexibility and possible synergic effects of diverse components are promising OL materials.…”

“…[3] Typical OL materials contain carbon-based materials (including carbon black, carbon nanotubes, fullerenes and graphene), [4] organic dyes and polymers (such as phthalocyanine and porphyrin), [5,6] inorganic metal nanoparticle and quantum dots, [7][8][9] as well as organic and inorganic hybrid materials. [10][11][12][13][14][15][16] Hybrid materials possessing flexibility and possible synergic effects of diverse compo-nents are promising OL materials. As a result, aggregated crystalline materials like coordination polymers, metalorganic frameworks and metal complexes are among the materials that might become the next generation in the current field.…”

BSA-encapsulated cyclometalated iridium complexes as nano-photosensitizers for photodynamic therapy of tumor cells

“…[21][22][23][24] Benet from the development of chemical synthesis, many types of photosensitizers have been developed. Among them, noble metal complex photosensitizers have attracted great attention, such as ruthenium complexes, 25,26 platinum complexes, 27,28 iridium complexes, 29,30 etc. Iridium Ir(III) complexes possess higher intersystem crossing efficiency and better photobleaching resistance than some organic photosensitizers.…”

High-Performance Optical Power Limiting Filters at Telecommunication Wavelengths: When Aza-BODIPY Dyes Bond to Sol–Gel Materials

“…This self-activated instantaneous response is a key advantage for practical applications. It has been widely demonstrated that OPL in the visible spectral range can be strongly enhanced if an excited-state absorption (ESA) phenomenon overlaps temporally and spectrally with the 2PA. ,,− However, in spite of the rapid development since 2005 of two-photon dyes absorbing in the SWIR spectral range, − OPL at 1300–1600 nm is a field of research still in its infancy. Therefore, only few reports describing OPL experiments at telecommunication wavelengths have appeared; so far, polymethine dyes, , functionalized porphyrins, and aza-BODIPY dyes in a solvent solution have been presented. , In all cases, a 2PA-induced ESA photophysical process is responsible for the OPL mechanism .…”