Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 6, Issue 31, Pages 8495-8501Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8tc02364f
Keywords
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Funding
- National Natural Science Foundation of China (NSFC) [21702214, 21522203]
- Director Foundation of the Technical Institute of Physics and Chemistry, Chinese Academy of Sciences [2017-SJB]
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To accomplish broadband optical limiting with high visible-light region (ca. 400-700 nm) transmittance, as well as to satisfy the requirement of practical applications, a novel molecule, TTF-Pt(bzimb), has been rationally designed and synthesized by connecting an excellent electron donating tetrathiafulvalene and a Pt(II)-incorporated electron withdrawing Pt(bzimb) with a C-C triple bond. Chlorine substituted Cl-Pt(bzimb) was presented for comparison. As expected, the theoretical calculation results clearly demonstrate that TTF-Pt(bzimb) exhibits a twisted conformation with a dihedral angle of 501 at the C-C triple bond. The intramolecular charge transfer existing between the donor and the acceptor is well evidenced by a series of experimental results such as UV-vis spectra, fluorescence spectra, and CV. Benefiting from a unique conformation, TTF-Pt(bzimb) and its doped Ormosil gel glasses in a methyltriethoxysilane matrix exhibit broadband (532 and 1064 nm) optical limiting behaviour with high visible-light transmittance. Furthermore, TTF-Pt(bzimb) shows more remarkable optical limiting behaviour than the state-of-the-art optical limiting material, C-60, under 532 nm. Thus, our results disclose a rational molecular design strategy for the accomplishment of remarkable optical limiting. TTF-Pt(bzimb) and its gel glasses can be considered as promising candidates for the applications of optical limiting and for use in nonlinear optical devices.
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