Intramolecular charge transfer induced by deprotonation of hydroxyl groups in π-conjugated polymers with π-deficient aromatic rings

2011 ◽  
Vol 71 (2) ◽  
pp. 140-147 ◽  
Author(s):  
Isao Yamaguchi ◽  
Hidehito Mitsuno
Keyword(s):  
Charge Transfer ◽  
Conjugated Polymers ◽  
Intramolecular Charge Transfer ◽  
Hydroxyl Groups ◽  
Aromatic Rings

Facial Control Intramolecular Charge Transfer of Quinoid Conjugated Polymers for Efficient in Vivo NIR-II Imaging

2019 ◽  
Vol 11 (18) ◽  
pp. 16311-16319 ◽  
Author(s):  
Wansu Zhang ◽  
Ting Huang ◽  
Jiewei Li ◽  
Pengfei Sun ◽  
Yufeng Wang ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Conjugated Polymers ◽  
Intramolecular Charge Transfer

Novel low-band-gap conjugated polymers using an alternating donor/acceptor repeat unit

e-Polymers ◽  
2010 ◽  
Vol 10 (1) ◽  
Author(s):  
Phimwipha Piyakulawat ◽  
Anusit Keawprajak ◽  
Anon Chindaduang ◽  
Anke Helfer ◽  
Udom Asawapirom
Keyword(s):  
Cyclic Voltammetry ◽  
Charge Transfer ◽  
Conjugated Polymers ◽  
Lower Energy ◽  
Intramolecular Charge Transfer ◽  
Repeat Unit ◽  
Band Gaps ◽  
Donor And Acceptor ◽  
Donor Acceptor ◽  
Positive Step

AbstractA series of new π-conjugated donor-acceptor copolymers, based on a naphthalene-bisimide moiety as the electron-acceptor and connected to either thiophene or dialkylfluorene as the electron-donor, were synthesized. The polymers are soluble in common organic solvents. The UV-Vis spectra of the copolymers in chloroform showed two absorption maxima at higher energies (ca. 301 - 364 nm), assigned to the π-π * transition, and at a lower energy (ca. 512 - 595 nm), ascribed to the intramolecular charge transfer between donor and acceptor units. Cyclic voltammetry revealed that the polymers were susceptible to both electrochemical oxidation and reduction, and they had a LUMO and HOMO levels ranging from -4.07 to -3.80 eV and -6.13 to -5.64 eV, respectively. The energy band gaps were estimated to be 1.48 - 2.06 eV. These results represent a positive step towards making novel compounds suitable for electronic applications.

Folded Conformations. IV. Intramolecular Shielding and Intramolecular Charge-Transfer Interaction in Benzyl Phenyl Sulfones and Sulfoxides

1973 ◽  
Vol 51 (8) ◽  
pp. 1187-1191 ◽  
Author(s):  
(Mrs.) Renée van Est-Stammer ◽  
Jan B. F. N. Engberts
Keyword(s):  
Charge Transfer ◽  
Intramolecular Charge Transfer ◽  
Charge Transfer Band ◽  
Alkyl Substituent ◽  
Aromatic Proton ◽  
Electron System ◽  
High Electron ◽  
Aromatic Rings ◽  
Proton Resonances ◽  
Repulsive Forces

Proton magnetic resonance spectra of the title compounds (A-SO2CHR-D) were measured and compared with the spectra of appropriate reference systems containing an alkyl substituent instead of one of the aromatic rings. The observed upfield shifts of the aromatic proton resonances in the title compounds suggest that there is a significant population of folded conformations, which possess a gauche orientation of the aromatic rings. This conclusion is supported by the observation of an intramolecular charge-transfer band in the u.v. spectra of the compounds containing an A ring of high electron affinity and a D ring of low ionization potential. Stabilization of the folded forms may be obtained through minimizing the n–π repulsive forces between the sulfonyl oxygen lone pairs and the π-electron system of the D ring.

Dynamic adjustment of emission from both singlets and triplets: the role of excited state conformation relaxation and charge transfer in phenothiazine derivates

2021 ◽  
Author(s):  
Weidong Qiu ◽  
Xinyi Cai ◽  
Mengke Li ◽  
Liangying Wang ◽  
Yanmei He ◽  
...  
Keyword(s):  
Excited State ◽  
Charge Transfer ◽  
Intramolecular Charge Transfer ◽  
Dynamic Adjustment ◽  
Twisted Intramolecular Charge Transfer

Dynamic adjustment of emission behaviours by controlling the extent of twisted intramolecular charge transfer character in excited state.

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