Metal-Organic Interface Dipole and Charge Transfer
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Charge transfer dissociation at donor–acceptor (D-A) interfaces is one of the key factors for the performance of organic optoelectronic devices. In this work, through control of both acceptor dipole and D-A dipole, charge transfer dissociation at molecular heterojunction is studied. With the effect of dipole moment of dipolar acceptor, charge transfer states at molecular heterojunction will fully dissociate, where both external magnetic field and electric field have no effect on the tunability of the dipole moment of the D-A unit. However, blocking the dipole effect of dipolar acceptor, photoexcited charge transfer states will remain undissociated states, where the D-A dipole is generated at the molecular heterojunction of the D-A unit. D-A dipole has little contribution on neighbor charge transfer dissociation, and both the magnetic and the electric fields could enhance the D-A dipole moment of the undissociated charge transfer state at the molecular heterojunction.
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Abstract The ground state dipole moment. , and the change in dipole moment upon excitation, , of various dyes have been determined from electrochromic measurements on solutions in polymer matrices. The merits of this method are discussed. High values of , much in excess of the sum of local group moments, are found for compounds in which a polar ground state is stabilized by large differences in electronegativity of the constituting groups ("Zwitterions") and/or by a gain in resonance energy accompanying a charge transfer in π-electron ring systems. High values of , indicating a large charge transfer upon excitation, are connected with a loss of resonance energy. The amount of charge, transferred upon excitation from the donor group of the dye to the acceptor group, does not decrease significantly if the geometric distance between these groups is increased by inserting enthynylenic groups.
Electronegativity
Acceptor
Chemical polarity
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Dynamics
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A model based on the Hartree-Fock-Slater theory is proposed for the charge transfer in ionic materials. Application of this model to some diatomic molecules is demonstrated. Most available experimental data are well reproduced.
Diatomic molecule
Ionic potential
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The authors construct a model for determining photostimulated charge transfer in organic macromolecules based on molecules with a high value of photoexcitation and a sufficiently long lifetime of the photoexcited state owing to intersystem crossing to the triplet state. In this connection the change in the dipole moment of the molecules during the transition from the ground state to the photoexcited state was determined using measurements of the Stark effect for isotropic polymeric solutions. In addition a long hydrocarbon tail was fastened to the molecules to make it possible to use the Blodgett-Langmuir technique to prepare solid multimolecular layers with a given molecular orientation. The multilayer is placed between two semitransparent aluminium electrodes in order to record the electrical signal during exposure to light along with the photoelectromotive force.
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Intersystem crossing
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTToward a Quantitative Understanding of Dipole-Moment Changes in Charge-Transfer Transitions: Electroabsorption Spectroscopy of Transition-Metal ComplexesYeung-gyo K. Shin, Bruce S. Brunschwig, Carol Creutz, and Norman SutinCite this: J. Am. Chem. Soc. 1995, 117, 33, 8668–8669Publication Date (Print):August 1, 1995Publication History Published online1 May 2002Published inissue 1 August 1995https://pubs.acs.org/doi/10.1021/ja00138a024https://doi.org/10.1021/ja00138a024research-articleACS PublicationsRequest reuse permissionsArticle Views285Altmetric-Citations44LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access optionsGet e-AlertscloseSupporting Info (2)»Supporting Information Supporting Information Get e-Alerts
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharge-transfer properties of the hydrogen bond. II. Charge-transfer theory and the relation between the enhancement of dipole moment and the ionization potential of hydrogen-bonded systemsHenryk RatajczakCite this: J. Phys. Chem. 1972, 76, 26, 3991–3992Publication Date (Print):December 1, 1972Publication History Published online1 May 2002Published inissue 1 December 1972https://pubs.acs.org/doi/10.1021/j100670a018https://doi.org/10.1021/j100670a018research-articleACS PublicationsRequest reuse permissionsArticle Views190Altmetric-Citations39LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access options Get e-Alerts
Bond dipole moment
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Acceptor
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A theoretical model for charge transfer reaction at molecule metal interface has developed. Many solvents for charge transfer media used to knowing and discussion the effect of polarity media on flow transfer. HATNA and HATNA-CI6 molecules using to contact with Cu metal. The theoretical model discussion the mechanism of charge transfer in two system. HATNA- CI6/Cu interface show large flow charge transfer compare with HATNA /Cu. The flow charge rate increases with increases strength coupling and driving force energy and decreasing with increases transition energy.
Polarity (international relations)
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