Effect of the electron donating group on the excited-state electronic nature and epsilon-near-zero properties of curcuminoid-borondifluoride dyes
- 주제(기타) Chemistry, Multidisciplinary
- 설명문(일반) [Choi, Kyu-Ri; Kim, Dae Hyeon; Placide, Virginie; Huynh, Steven; Wu, Jeong Weon] Ewha Womans Univ, Dept Phys, Seoul 03760, South Korea; [Lee, Yeon Ui] Chungbuk Natl Univ, Dept Phys, Chungbuk 28644, South Korea; [Yao, Dandan; Canard, Gabriel; Zaborova, Elena; Fages, Frederic; D'Aleo, Anthony] Aix Marseille Univ, CNRS, CINaM, UMR 7325, Campus Luminy,Case 913, F-13288 Marseille, France; [Mathevet, Fabrice] Sorbonne Univ, Fac Sci, Chim Polymeres, Parisien Chim Mol IPCM,UMR 8232,CNRS, F-75005 Paris, France; [Mager, Loic; Heinrich, Benoit; D'Aleo, Anthony] Univ Strasbourg, Inst Phys & Chim Mat Strasbourg, CNRS, UMR 7504, F-67000 Strasbourg, France; [Ribierre, Jean-Charles] Kyushu Univ, Ctr Organ Photon & Elect Res OPERA, Fukuoka 8190395, Japan
- 등재 SCIE, SCOPUS
- OA유형 Green Submitted, gold, Green Published
- 발행기관 ROYAL SOC CHEMISTRY
- 발행년도 2021
- 총서유형 Journal
- URI http://www.dcollection.net/handler/ewha/000000190257
- 본문언어 영어
- Published As https://doi.org/10.1039/d1ra08025c
- PubMed https://pubmed.ncbi.nlm.nih.gov/35498060
초록/요약
Epsilon-near-zero (ENZ) properties have been reported in organic molecular films. In particular, cyanine and squaraine films have been shown to exhibit ENZ properties in the visible spectral region with a strong 3(rd) order nonlinear optical response near the ENZ spectral region. Noting both cyanine and squaraine belong to the polymethine family, a series of six curcuminoid borondifluoride (Curc) derivatives were developed to examine whether such a polymethine character is positively correlated with the ENZ property of the organic films. Those Curc derivatives possess a Donor-Acceptor-Donor (D-A-D) architecture with acceptor, AcacBF(2), located at the molecular center. The backbone of Curc is designed such that the donor strength can be tuned to transit between charge transfer (CT) and polymethine character. This balance between CT and polymethine character of the Curc series is examined based on the Lippert-Mataga plot. As donor strength in the D-A-D structure increases, CT character is less marked resulting in a more dominant polymethine character. The structural and optical properties of the Curc films with a thickness in the order of 30 nm were examined to correlate the polymethine character with the ENZ response. The results obtained in isotropic Curc thin films demonstrate that an increase of polymethine character associated with a stronger donor strength leads to an appearance/enhancement of the ENZ property in the visible spectrum range from 500 to 670 nm. Overall, this study provides useful guidelines to engineer new organic materials showing ENZ properties in a desired spectral range.
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