Articles producció científica> Química Física i Inorgànica

TD-DFT Study of the Light-induced Spin Crossover of Fe(III) Complexes

  • Dades identificatives

    Identificador: PC:3125
    Autors:
    De Graaf, C.Saure, S.
    Resum:
    Two light-induced spin-crossover Fe(III) compounds have been studied with time-dependent density functional theory (TD-DFT) to investigate the deactivation mechanism and the role of the ligand-eld states as intermediates in this process. The B3LYP* functional has previously shown its ability to accurately describe (light-induced) spin-crossover inFe(II) complexes. Here, we establish its performance for Fe(III) systems using [Fe(qsal)2]+(Hqsal=2-[(8-quinolinylimino)methyl] phenol) and [Fe(pap)2]+ (Hpap=2-(2-pyridylmethyleneamino)phenol) as test cases comparing the B3LYP* results to experimental information and to multicongurational wave function results. In addition to rather accurate high spin (HS) and low spin (LS) state geometries, B3LYP* also predicts ligand-to-metal charge transfer (LMCT) states with large oscillator strength in the energy range where the UV-VIS spectrum shows an intense absorption band, whereas optically allowed - excitations on the ligands were calculated at higher energy. Subsequently, we have generated a two-dimensional potential energy surface of the HS and LS states varying the Fe-N and Fe-O distances. LMCT and metal centered (MC) excited states were followed along the approximate minimal energy path that connects the minima of the HS and LS on this surface. The 2LMCT state has a minimum in the same region as the initial LS state, where we also observe a crossing with the intermediate spin (IS) state. Upon the expansion of the coordination sphere of the Fe(III) ion, the IS state crosses with the HS state and further expansion of the coordination sphere leads to the excited spin state trapping as observed in experiment. The calculation of the intersystem crossing rates reveals that the deactivation from 2LMCT!IS!HS competes with the 2LMCT!IS!LS
  • Altres:

    Autor segons l'article: De Graaf, C. ; Saure, S.
    Departament: Química Física i Inorgànica
    Autor/s de la URV: DE GRAAF , CORNELIS; Saure, S.
    Paraules clau: TD-DFT Fe(III) Complexes Light induced spin cross over
    Resum: Two light-induced spin-crossover Fe(III) compounds have been studied with time-dependent density functional theory (TD-DFT) to investigate the deactivation mechanism and the role of the ligand-eld states as intermediates in this process. The B3LYP* functional has previously shown its ability to accurately describe (light-induced) spin-crossover inFe(II) complexes. Here, we establish its performance for Fe(III) systems using [Fe(qsal)2]+(Hqsal=2-[(8-quinolinylimino)methyl] phenol) and [Fe(pap)2]+ (Hpap=2-(2-pyridylmethyleneamino)phenol) as test cases comparing the B3LYP* results to experimental information and to multicongurational wave function results. In addition to rather accurate high spin (HS) and low spin (LS) state geometries, B3LYP* also predicts ligand-to-metal charge transfer (LMCT) states with large oscillator strength in the energy range where the UV-VIS spectrum shows an intense absorption band, whereas optically allowed - excitations on the ligands were calculated at higher energy. Subsequently, we have generated a two-dimensional potential energy surface of the HS and LS states varying the Fe-N and Fe-O distances. LMCT and metal centered (MC) excited states were followed along the approximate minimal energy path that connects the minima of the HS and LS on this surface. The 2LMCT state has a minimum in the same region as the initial LS state, where we also observe a crossing with the intermediate spin (IS) state. Upon the expansion of the coordination sphere of the Fe(III) ion, the IS state crosses with the HS state and further expansion of the coordination sphere leads to the excited spin state trapping as observed in experiment. The calculation of the intersystem crossing rates reveals that the deactivation from 2LMCT!IS!HS competes with the 2LMCT!IS!LS pathway, in line with the low eciency encountered in experiments.
    Grup de recerca: Química Quàntica
    Àrees temàtiques: Química Química Chemistry
    Accès a la llicència d'ús: https://creativecommons.org/licenses/by/3.0/es/
    ISSN: 1463-9076
    Identificador de l'autor: 0000-0001-8114-6658;
    Data d'alta del registre: 2018-02-28
    Pàgina final: 1244
    Versió de l'article dipositat: info:eu-repo/semantics/submittedVersion
    Enllaç font original: http://pubs.rsc.org/en/content/articlelanding/2016/cp/c5cp06620d#!divAbstract
    Programa de finançament: plan; Excelencia; CTQ2014-51938-P altres; Grupos Consolidados; 2014SGR199 altres; Xarxa d'R+D+I en Qumica Teorica i Computacional; XRQTC european; COST Action ECOSTBio; CM1305
    URL Document de llicència: https://repositori.urv.cat/ca/proteccio-de-dades/
    DOI de l'article: 10.1039/C5CP06620D
    Entitat: Universitat Rovira i Virgili
    Any de publicació de la revista: 2016
    Pàgina inicial: 1233
    Tipus de publicació: Article Artículo Article
  • Paraules clau:

    Funcional de densitat, Teoria del
    Ferro--Compostos
    TD-DFT
    Fe(III) Complexes
    Light induced spin cross over
    Química
    Química
    Chemistry
    1463-9076
  • Documents:

  • Cerca a google

    Search to google scholar