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Excited State Characters and Dynamics of [W(CO)5(4-cyanopyridine)] and [W(CO)5(piperidine)] Studied by Picosecond Time-Resolved IR and Resonance Raman Spectroscopy and DFT Calculations. Roles of W -> L, and W -> CO MLCT and LF Excited States Revised

The result's identifiers

  • Result code in IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388955%3A_____%2F04%3A00101038" target="_blank" >RIV/61388955:_____/04:00101038 - isvavai.cz</a>

  • Result on the web

  • DOI - Digital Object Identifier

Alternative languages

  • Result language

    angličtina

  • Original language name

    Excited State Characters and Dynamics of [W(CO)5(4-cyanopyridine)] and [W(CO)5(piperidine)] Studied by Picosecond Time-Resolved IR and Resonance Raman Spectroscopy and DFT Calculations. Roles of W -> L, and W -> CO MLCT and LF Excited States Revised

  • Original language description

    The character, dynamics and relaxation pathways of low-lying excited states of the complexes [W(CO)5L]; L = 4-CN-pyridine (pyCN) and piperidine (pip) were investigated by a combined theoretical and spectroscopic study. DFT and TD-DFT calculations revealed the delocalized character of chemically and spectroscopicaly relevant molecular orbitals and the presence of a manifold of low-lying CO .sigma.* - based unoccupied molecular orbitals. Traditional ligand-field arguments are not applicable. The lowest excited states of [W(CO)5(pyCN)] are W-pyCN MLCT in character, denoted MLCT(pyCN). They are closely followed in energy by W-CO MLCT states, MLCT(CO). Calculated changes of electron density distribution upon MLCT(pyCN) excitation show that the electron density is transferred from the whole W(CO)5 fragment to the pyCN ligand and highlight the electron-accepting role of the CN group. Optical excitation at 400 or 500 nm leads to population of a 3MLCT(pyCN).

  • Czech name

    Charakterizace a dynamika excitovaných stavů [W(CO)5(4-kyanopyridin)] a [W(CO)5(piperidin)] studovaná pikosekundovou časově rozlišenou IR a resonanční Ramanovou spektroskopií a DFT výpočty

  • Czech description

    Charakterizace, dynamika a relaxační cesta excitovaných stavů komplexů [W(CO)5L] (L= 4-kyanopyridin (pyCN) a piperidine (pip)] byla zkoumána pomocí teoretických a spektroskopických metod. DFT výpočty potvrdily delokalizovaný charakter chemicky a spektroskopicky relevantních molekulárních orbitalů a přítomnost nízko ležících CO .sigma.* neobsazených molekulárních orbitalů. Tradiční přístup ligandového pole zde není aplikovatelný. Nejnižší excitované stavy [W(CO)5(pyCN)] mají W - pyCN MLCT charakter a jsou následovány W - CO MLCT excitovanými stavy. Excitace při 400 or 500 nm populuje 3MLCT(pyCN) excitovaný stav, který byl charakterizován pikosekundovou časově rozlišenou IR a resonanční Ramanovou spektroskopií. Vibrace v excitovaných stavech byly přiřazeny DFT výpočty.

Classification

  • Type

    J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

  • CEP classification

    CF - Physical chemistry and theoretical chemistry

  • OECD FORD branch

Result continuities

  • Project

    <a href="/en/project/OC%20D14.20" target="_blank" >OC D14.20: Oganometallic and Metallo-organic Building Blocks for Photonic Materials</a><br>

  • Continuities

    Z - Vyzkumny zamer (s odkazem do CEZ)

Others

  • Publication year

    2004

  • Confidentiality

    S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Data specific for result type

  • Name of the periodical

    Inorganic Chemistry

  • ISSN

    0020-1669

  • e-ISSN

  • Volume of the periodical

    43

  • Issue of the periodical within the volume

    5

  • Country of publishing house

    US - UNITED STATES

  • Number of pages

    12

  • Pages from-to

    1723-1734

  • UT code for WoS article

  • EID of the result in the Scopus database