Article
Chemistry, Applied
Rodrigo Plaza-Pedroche, Dimitris Georgiou, Mihalis Fakis, Arnaud Fihey, Claudine Katan, Francoise Robin-le Guen, Sylvain Achelle, Julian Rodriguez-Lopez
Summary: White-light emission can be achieved by combining neutral and protonated forms of push-pull 4-substituted and 4,7-disubstituted quinazolines in the appropriate ratio. These compounds, prepared by straightforward Suzuki-Miyaura cross-coupling reactions, demonstrate remarkable emission solvatochromism and the ability to exhibit multicolor photoluminescence, including white light, through controlled protonation of the electron-deficient quinazoline ring.
Article
Spectroscopy
P. Yuvashri, T. Karthick, J. Roshni, Shobha R. Prabhu
Summary: In this study, the optical limiting response of a highly π-conjugated push-pull chalcone derivative (3DPNP) was investigated. The structure-property relationship of 3DPNP was explored through spectroscopic investigation and quantum chemical computations. The non-linear optical (NLO) response of 3DPNP was analyzed quantitatively and qualitatively, and its suitability for optical limiting applications in the continuous wave (CW) laser regime was confirmed.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2023)
Article
Chemistry, Physical
Eric Vauthey
Summary: The emissive properties of symmetric molecules with multiple donor-acceptor branches are often similar to those of single-branched analogues due to partial localization of excitation on one branch. Understanding this excited-state symmetry breaking (ES-SB) requires real-time monitoring of the process.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Organic
Pedada Srinivasa Rao, Samantha Brixi, Dada B. Shaikh, Mohammad Al Kobaisi, Benoit H. Lessard, Sidhanath V. Bhosale, Sheshanath V. Bhosale
Summary: The research designed and synthesized asymmetrical and symmetrical push-pull chromophores based on TPA donors and NDI acceptors, investigated the influence of TCNE and TCNQ linkers on the properties of these molecules, and studied their charge transfer characteristics in organic thin-film transistors.
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
(2021)
Article
Materials Science, Multidisciplinary
Wenbo Dai, Tommaso Bianconi, Elena Ferraguzzi, Xinghui Wu, Yunxiang Lei, Jianbing Shi, Bin Tong, Benedetta Carlotti, Zhengxu Cai, Yuping Dong
Summary: This study synthesized two new AIE materials and demonstrated the unique photoluminescence behavior of one material in different solvent environments. Experimental results showed that one material exhibited a significant intersystem crossing in low-polar solvents, leading to low emission efficiency but high singlet oxygen generation. The other material utilized a rigid matrix to stabilize triplet excitons, resulting in high room-temperature phosphorescence.
ACS MATERIALS LETTERS
(2021)
Article
Biochemistry & Molecular Biology
Tomas Hrivnak, Miroslav Medved, Wojciech Bartkowiak, Robert Zalesny
Summary: Contemporary design of organic non-linear optical materials relies on computational approaches to understand the relationships between molecular and electronic structure and properties. Researchers used density functional theory methods and an implicit solvent model to study the solvent effects on the non-linear optical properties of a series of compounds. The study found that solvent significantly affects the magnitudes of electronic and vibrational contributions, and that electrical and mechanical anharmonic contributions cancel each other out to a large extent.
Article
Chemistry, Multidisciplinary
Yanqi Ban, Linhong Hao, Zhenbo Peng, Lishui Sun, Lihua Teng, Yingjie Zhao
Summary: Two star-type push-pull chromophores (T1, T2) based on triphenylamine were designed and synthesized. The structures and molecular arrangement of the chromophores were confirmed by single-crystal X-ray diffraction. The photophysical research of T1 and T2 absorption characteristics and density functional theory (DFT) calculations verified their excellent two-photon absorption (TPA) properties. By adjusting the electronic structures of the chromophores, the TPA performance of the small organic molecule could be greatly enhanced, making them promising candidates for various two-photon applications.
CHINESE CHEMICAL LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Mohamed Yahya, A. Suvitha, Asmae Bouziani
Summary: A series of push-pull chromophores were designed and characterized in this study. The compounds exhibited reduced bandgap and higher second-order nonlinear optical properties.
OPTICAL AND QUANTUM ELECTRONICS
(2022)
Article
Chemistry, Multidisciplinary
Mandeep K. Chahal, Anuradha Liyanage, Ajyal Z. Alsaleh, Paul A. Karr, Jonathan P. Hill, Francis Dsouza
Summary: A new push-pull charge transfer complex, ZnP-SQ, can undergo enhanced excited state charge separation by binding axial F- to the zinc center. The presence of a spiro-quinone group promotes charge transfer interactions, and various analytical techniques have confirmed this process.
Article
Optics
Qingru Li, Christiaan N. Hulleman, Robert J. Moerland, Elil Mailvaganam, Srividya Ganapathy, Daan Brinks, Sjoerd Stallinga, Bernd Rieger
Summary: TIRF microscopy at cryogenic temperatures enhances photo-stability of fluorophores, and a waveguide-based approach provides a cost-effective method to achieve cellular observation under low temperature conditions.
Article
Chemistry, Applied
Shivani, Akriti Mishra, Virendra Kumar, Paramjit Kaur, Kamaljit Singh
Summary: The photophysical properties of a series of chromophores with push-pull type conjugation were studied to evaluate their potential as nonlinear optically active materials. The compounds showed promising first hyperpolarizability values and efficiency in nonlinear optical response, outperforming counterparts based on benzothiazole platform.
Article
Chemistry, Physical
Pragya Verma, Mariusz Tasior, Palas Roy, Stephen R. R. Meech, Daniel T. T. Gryko, Eric Vauthey
Summary: In polar environments, most quadrupolar dyes behave like their dipolar counterparts when photoexcited. This is due to excited-state symmetry breaking (ES-SB) where the electronic excitation localizes on one side of the molecule. In this study, two A-D-A dyes containing different acceptor groups were investigated using time-resolved vibrational spectroscopy. The results showed that ES-SB occurs in dyes with cyanophenyl acceptors but not with dicyanovinyl acceptors, attributed to differences in electronic coupling between the D-A branches.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Svetlana Shostak, Woojin Park, Juwon Oh, Jinseok Kim, Seunghoon Lee, Hyeongwoo Nam, Michael Filatov, Dongho Kim, Cheol Ho Choi
Summary: The excited-state aromatization dynamics in the photochemical ring opening of DHA was investigated using nonadiabatic molecular dynamics simulations and the mixed-reference spin-flip (MRSF)-TDDFT method. It was found that the ring opening occurs in the excited state through a series of steps with increasing aromaticity. The competition between Baird and anti-Baird channels suggests that the quantum yield of the photochemical products can be controlled by tipping their balance.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Physical
Wan Feng, Qingwei Jiang, Zhaolong Wang, Jianyang Zang, Gang Wang, Ke Liu, Haonan Peng, Taihong Liu, Liping Ding, Yu Fang
Summary: Intramolecular charge transfer and excited-state symmetry breaking play a significant role in the nonlinear optical properties of multipolar chromophores. This study comprehensively investigates the properties of functionalized perylene bisimide derivatives in different solvents, revealing differences in exciton coupling, excited-state symmetry breaking, absorption spectra, and nonlinear optical properties.
JOURNAL OF PHYSICAL CHEMISTRY B
(2022)
Article
Chemistry, Physical
Vijayendran Gowri, Sachin Jalwal, Arif Hassan Dar, Arya Gopal, Azhagumuthu Muthukrishnan, Ashima Bajaj, Md. Ehesan Ali
Summary: A new non-planar push-pull chromophore has been found to be an efficient system for detecting F- ion in water, with the sensing mechanism governed by H-bonding and deprotonation. However, replacing the phenyl group with DMA led to the failure of colorimetric and fluorometric detections due to masking and quenching effects. Excellent sensitivity and specificity towards F- was demonstrated in a successful tissue paper-based visual strip detection method.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2021)
