Hydrogen Bonding in the Electronic Excited State

Zhao, G.; Han, Keli

doi:10.1021/ar200135h

Cited by 1,178 publications

(846 citation statements)

References 61 publications

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“…Han and co-workers [27][28][29][30] have shown that intermolecular interactions can have a significant effect on the photophysical and photochemical properties of chromophores. Hbonding to a range of chromophores is found to be significantly strengthened upon photoexcitation and has a significant effect on absorption and fluorescence spectra.…”

Section: Resultsmentioning

confidence: 99%

“…Similarly, we investigated the effects of water coordination to both the carbonyl oxygen and the bridging oxygen of the anhydride groups and found that there is only a very slight shift of the first peak to longer wavelength (~ 4 nm) and no change at all for the second and third peaks. Therefore, unlike coumarin and fluoenone, [30] which are carbonyl chromophores, PDI and PTCA are relatively unaffected by intermolecular H-bonding.…”

Section: Resultsmentioning

confidence: 99%

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Interpreting the near-infrared reflectance of a series of perylene pigments

2013

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. and combination modes of fundamental IR vibrations appear to be more important in explaining the observed variations in NIR reflectance/absorbance. Aromatic groups lead to a small number of intense NIR bands, while alkyl groups generally lead to a greater number of less intense NIR bands. However, neighbouring group effects and/or a molecular dipole moment can substantially alter the intensity of these bands.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Interpreting the near-infrared reflectance of a series of perylene pigments

2013

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“…The oxygen and hydrogen atoms are included in OH bending groups and don't participate to the connections between the monomers, but these atoms participate in the hydrogen bonds established between the bending groups OH of two neighboring chains, [21]. A detailed description of the behavior of the hydrogen bonds in the excited state, caused by the interaction of matter with radiation is presented in references [22,23].…”

Section: Resultsmentioning

confidence: 99%

ESR and XRD investigation of effects induced by gamma radiation on PVA-TiO2 membranes

et al. 2013

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Abstract:The effects of gamma radiation on the local structure of PVA membranes containing TiO 2 were investigated by ESR and XRD methods. An intense ESR signal is observed after irradiation at 16 KGy dose. This signal appears only for irradiated samples and it is associated with the breaking of the polymeric chain, followed by local reorganization of the polymeric segments and the apparition of the unpaired electrons and free radicals. The intensity of the signal decreases with the concentration of TiO 2 , indicating a shielding effect of the dopand. That the modification of local order of the polymeric chains has been modified after irradiation is confirmed by XRD method. PACS

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“…13 We have combined density functional theory (DFT)/time-dependent density functional theory (TDDFT) quantum chemistry calculations and spectroscopic methods to study the photophysical properties of a number of platinum (Pt) complexes. [14][15][16]28 Combining the DFT/ TDDFT method and spectral experiments is an effective technique in studying Pt-containing supramolecular systems. 21,29−34 Bimetallic platinum complexes are extensively used in the formation of coordination-driven self-assembled supramolecules.…”

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Experimental and Theoretical Study on the Photophysical Properties of 90° and 60° Bimetallic Platinum Complexes

et al. 2012

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The 90°and 60°bimetallic platinum complexes with special structures are widely used in coordination-driven selfassembled metallosupramolecular architectures, and these complexes are the key components of triangular, rectangular, and polygonal metallacycle and metallocage supramolecules. Therefore, spectroscopic techniques and quantum chemistry calculations were employed in this article to investigate the photophysical properties of these bimetallic platinum complexes. Compared with spectra for the ligands, the absorption spectra of these Pt complexes are redshifted, and the fluorescence spectra become wider and are also redshifted. Moreover, the reasons for the low fluorescence quantum yields and short fluorescence lifetimes of these compounds were investigated using quantum chemistry calculations. We demonstrate that the fluorescent states of the bimetallic platinum complexes can be considered as local excited states, and that they possess a ligand-centered π−π* transition feature. Meanwhile, the platinum metals act as perturbation for these transitions, whereas the nonfluorescent states are classified as intramolecular charge-transfer states. Furthermore, a new fluorescence modulation mechanism is developed to explain the different emission processes of these complexes with different ligands. ■ INTRODUCTIONCoordination-driven self-assembly employs directional metal− ligand interactions in the assembly process and provides a facile method of assembling a number of molecules into highly organized metallosupramolecular architectures. 1 These selfassembled macromolecules have been widely investigated in many fields, such as in synthetic chemistry, medicinal chemistry, molecular devices, chemical sensors, and so on. 1,2 Recently, Stang and co-workers have reported a series of supramolecules on the basis of the self-recognition processes. 3−5 Therrien et al. discovered that a trigonal prism metallacage host system can deliver drugs into cancer cells. 6−9 Chi and co-workers designed a number of two-dimensional polygons and three-dimensional cages that contain transition metals as fluorescent chemosensors for dicarboxylate anions and nitroaromatics, especially for picric acid. 2,10 Considering the many special electronic and optical properties of organometallic systems, increasing attentions are focused on the photophysical processes of organometallic materials. 11−16 Various experimental techniques, such as the two-photon absorption, steady-state fluorescence, and transient absorption, have been employed to study the photophysical and chargetransfer processes of self-assembled materials. 1 Yam, Wong, and others performed systematic investigations on the luminescence property of many platinum complexes. 17−27 Goodson and coworkers have employed femtosecond fluorescence upconversion and transient absorption to investigate different platinumcontaining metallacycles. 13 We have combined density functional theory (DFT)/time-dependent density functional theory (TDDFT) quantum chemistry calculations and spectros...

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Hydrogen Bonding in the Electronic Excited State

Cited by 1,178 publications

References 61 publications

Interpreting the near-infrared reflectance of a series of perylene pigments

Interpreting the near-infrared reflectance of a series of perylene pigments

ESR and XRD investigation of effects induced by gamma radiation on PVA-TiO2 membranes

Experimental and Theoretical Study on the Photophysical Properties of 90° and 60° Bimetallic Platinum Complexes

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