Relaxation dynamics in three polypyridyl iron(II)-based complexes probed by nanosecond and sub-picosecond transient absorption spectroscopy
Year: 2008
Authors: Lapini A., Foggi P., Bussotti L., Righini R., Dei A.
Autors Affiliation: European Laboratory for non-Linear Spectroscopy, Via Nello Carrara 1, 50019 Sesto Fiorentino, Firenze, Italy; Dipartimento di Chimica dell\’Università, LAMM UdR INSTM, Via della Lastruccia 3, 50019 Sesto Fiorentino, Firenze, Italy
Abstract: The results of a sub-picosecond transient absorption spectroscopy study on a mononuclear and two dinuclear low-spin iron(II) complexes is reported. The dinuclear derivatives are homonuclear (i.e. Fe-Fe) and heterodinuclear (Fe-Zn) in nature. The ligands we used were 2-pyridylmethyl-ketazine and 2-pyridylmethyl-hydrazone. Irradiation was made on the metal-to-ligand CT band occurring around 500 nm. The observed pattern of the relaxation decays is consistent with the population of the metastable 5T2 ligand field state within the first 100 fs after the photon absorption from the three different chromophores. The suggested implication of triplet intermediate states was not detected. The ground state recovery was observed to occur with a time constant of 350 ps for the mononuclear complex and 1600-1800 ps for the two dinuclear complexes.
Journal/Review: INORGANICA CHIMICA ACTA
Volume: 361 (14-15) Pages from: 3937 to: 3943
More Information: FIRB-RBNE033KMA. – The present work was supported by the Italian Ministry for Research, projects FIRB-RBNE033KMA.KeyWords: MLCT relaxation; Spin crossover compounds; Transient absorptionDOI: 10.1016/j.ica.2008.03.010ImpactFactor: 1.940Citations: 15data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2024-11-24References taken from IsiWeb of Knowledge: (subscribers only)Connecting to view paper tab on IsiWeb: Click hereConnecting to view citations from IsiWeb: Click here
