Photochemistry using a host–guest charge transfer paradigm: DMABN as a dynamical probe of ground and excited states

2021 ◽  
Vol 23 (15) ◽  
pp. 9280-9284
Author(s):  
Rahul Gera ◽  
Jyotishman Dasgupta
Keyword(s):  
Charge Transfer ◽  
Excited States ◽  
Charge Transfer Complex ◽  
Water Soluble ◽  
Molecular Probe ◽  
Transfer Paradigm

Dimethylaminobenzonitrile (DMABN) is used as a molecular probe of structural and dynamical aspects of a water-soluble host–guest charge transfer complex.

Supramolecular Amphiphiles Based on a Water-Soluble Charge-Transfer Complex: Fabrication of Ultralong Nanofibers with Tunable Straightness

2009 ◽  
Vol 121 (47) ◽  
pp. 9124-9127 ◽  
Author(s):  
Chao Wang ◽  
Yinsheng Guo ◽  
Yapei Wang ◽  
Huaping Xu ◽  
Ruji Wang ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Charge Transfer Complex ◽  
Water Soluble ◽  
Supramolecular Amphiphiles

scholarly journals Water-Soluble Visible Light Sensitive Photoinitiating System Based on Charge Transfer Complexes for the 3D Printing of Hydrogels

Polymers ◽  
2021 ◽  
Vol 13 (18) ◽  
pp. 3195
Author(s):  
Hong Chen ◽  
Mehdi Vahdati ◽  
Pu Xiao ◽  
Frédéric Dumur ◽  
Jacques Lalevée
Keyword(s):  
Charge Transfer ◽  
3D Printing ◽  
Visible Light ◽  
Water Solubility ◽  
Charge Transfer Complex ◽  
Water Soluble ◽  
Charge Transfer Complexes ◽  
Free Radical Photopolymerization ◽  
Potential Applications ◽  
A Charge

The development of visible-light 3D printing technology by using water-soluble initiating systems has attracted widespread attention due to their potential applications in the manufacture of hydrogels. Besides, at present, the preparation of water-soluble photoinitiators suitable for visible light irradiation (such as LEDs) still remains a challenge. Therefore, this work is devoted to developing water-soluble photoinitiators (PI)/photoinitiating systems (PIS) upon irradiation with a LED @ 405 nm. In detail, a new water-slightly-soluble chalcone derivative dye [(E)-3-(4-(dimethylamino) phenyl)-1-(4-(2-(2-(2-methoxyethoxy) ethoxy) ethoxy) phenyl) prop-2-en-1-one] was synthesized here and used as a PI with a water-soluble coinitiator, i.e., triethanolamine (TEA) which was also used as an electron donor. When combined together, a charge transfer complex (CTC) formed immediately which exhibited excellent initiating ability for the free radical photopolymerization of poly(ethyleneglycol)diacrylate (PEG-DA). In light of the powerful CTC effect, the [dye-TEA] CTC could not only exhibit enhanced water solubility and mechanical properties but could also be effectively applied for 3D printing. This CTC system is environmentally friendly and cost-saving which demonstrates a great potential to prepare hydrogels via photopolymerization.

Study on excited states of hexamethoxybenzene-NO+ charge-transfer complex: incorporation of excited radical cation

2012 ◽  
Vol 39 (1) ◽  
pp. 425-435 ◽  
Author(s):  
Nobuyuki Ichinose ◽  
Masahide Hagiri ◽  
Jun-ichiro Kinugasa ◽  
Nobuyuki Shichi ◽  
Toshihiro Nakayama
Keyword(s):  
Charge Transfer ◽  
Excited States ◽  
Radical Cation ◽  
Charge Transfer Complex ◽  
Excited Radical

Contrasting Behaviour of Exciplex Ensembles in the Diastereodifferentiating Paternò–Büchi Reaction of Chiral Cyanobenzoate with Naphthyl- and Phenylethenes on Direct or Charge-Transfer Excitation

2015 ◽  
Vol 68 (11) ◽  
pp. 1693 ◽  
Author(s):  
Keisuke Nagasaki ◽  
Yoshihisa Inoue ◽  
Tadashi Mori
Keyword(s):  
Charge Transfer ◽  
Excited States ◽  
Charge Transfer Complex ◽  
Small Temperature ◽  
Acceptor Interaction ◽  
Subtle Change ◽  
Excited Species ◽  
Donor Acceptor ◽  
Charge Transfer Excitation ◽  
The Difference

The diastereodifferentiating Paternò–Büchi reaction of chiral cyanobenzoate with 1-(1-naphthyl)-1-phenylethene was compared with those with 1,1-diphenylethene on direct and charge-transfer excitations. By desymmetrization of the donor, four diastereomeric oxetane products were formed on photolysis in excellent combined yields. Increase in donor strength induced a stronger charge-transfer interaction both in ground and excited states. Thus, the difference in diastereoselectivities with two different excitation modes (i.e. direct versus charge-transfer) became less significant with a naphthyl derivative as donor. A subtle change of donor–acceptor interaction was shown to have profound effect on the nature of the excited-state complexes and thus the product (stereo)selectivities. Despite a small temperature dependence, an Eyring-type study on the diastereoselectivities confirmed that the excited charge-transfer complex is an excited species distinct from the conventional exciplex.

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