1
|
Maçôas EMS, Mustalahti S, Myllyperkiö P, Kunttu H, Pettersson M. Role of Vibrational Dynamics in Electronic Relaxation of Cr(acac)3. J Phys Chem A 2015; 119:2727-34. [DOI: 10.1021/jp509905q] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ermelinda M. S. Maçôas
- Nanoscience
Center, Department
of Chemistry, University of Jyväskylä, P.O. Box 35, FI-40014, Jyväskylä, Finland
| | - Satu Mustalahti
- Nanoscience
Center, Department
of Chemistry, University of Jyväskylä, P.O. Box 35, FI-40014, Jyväskylä, Finland
| | - Pasi Myllyperkiö
- Nanoscience
Center, Department
of Chemistry, University of Jyväskylä, P.O. Box 35, FI-40014, Jyväskylä, Finland
| | - Henrik Kunttu
- Nanoscience
Center, Department
of Chemistry, University of Jyväskylä, P.O. Box 35, FI-40014, Jyväskylä, Finland
| | - Mika Pettersson
- Nanoscience
Center, Department
of Chemistry, University of Jyväskylä, P.O. Box 35, FI-40014, Jyväskylä, Finland
| |
Collapse
|
2
|
Canton SE, Zhang X, Liu Y, Zhang J, Pápai M, Corani A, Smeigh AL, Smolentsev G, Attenkofer K, Jennings G, Kurtz CA, Li F, Harlang T, Vithanage D, Chabera P, Bordage A, Sun L, Ott S, Wärnmark K, Sundström V. Watching the dynamics of electrons and atoms at work in solar energy conversion. Faraday Discuss 2015; 185:51-68. [DOI: 10.1039/c5fd00084j] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The photochemical reactions performed by transition metal complexes have been proposed as viable routes towards solar energy conversion and storage into other forms that can be conveniently used in our everyday applications. In order to develop efficient materials, it is necessary to identify, characterize and optimize the elementary steps of the entire process on the atomic scale. To this end, we have studied the photoinduced electronic and structural dynamics in two heterobimetallic ruthenium–cobalt dyads, which belong to the large family of donor–bridge–acceptor systems. Using a combination of ultrafast optical and X-ray absorption spectroscopies, we can clock the light-driven electron transfer processes with element and spin sensitivity. In addition, the changes in local structure around the two metal centers are monitored. These experiments show that the nature of the connecting bridge is decisive for controlling the forward and the backward electron transfer rates, a result supported by quantum chemistry calculations. More generally, this work illustrates how ultrafast optical and X-ray techniques can disentangle the influence of spin, electronic and nuclear factors on the intramolecular electron transfer process. Finally, some implications for further improving the design of bridged sensitizer-catalysts utilizing the presented methodology are outlined.
Collapse
|
3
|
Patricia TT, Sandra MV, Manuela L, Andrea L, Paolo F, Andrea D, Roberto R. Transient infrared spectroscopy: a new approach to investigate valence tautomerism. Phys Chem Chem Phys 2012; 14:1038-47. [DOI: 10.1039/c1cp22557j] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
4
|
El-Khoury PZ, George L, Kalume A, Reid SA, Ault BS, Tarnovsky AN. Characterization of iso-CF2I2 in frequency and ultrafast time domains. J Chem Phys 2010; 132:124501. [DOI: 10.1063/1.3357728] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
5
|
Tschierlei S, Presselt M, Kuhnt C, Yartsev A, Pascher T, Sundström V, Karnahl M, Schwalbe M, Schäfer B, Rau S, Schmitt M, Dietzek B, Popp J. Photophysics of an Intramolecular Hydrogen-Evolving Ru-Pd Photocatalyst. Chemistry 2009; 15:7678-88. [DOI: 10.1002/chem.200900457] [Citation(s) in RCA: 123] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
|
6
|
Gabrielsson A, Towrie M, Záliš S, Vlček A. Nanosecond CO Photodissociation and Excited-State Character of [Ru(X)(X′)(CO)2(N,N′-diisopropyl-1,4-diazabutadiene)] (X = X′ = Cl or I; X = Me, X′ = I; X = SnPh3, X′ = Cl) Studied by Time-Resolved Infrared Spectroscopy and DFT Calculations. Inorg Chem 2008; 47:4236-42. [DOI: 10.1021/ic702304k] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Anders Gabrielsson
- School of Biological and Chemical Sciences, Queen Mary, University of London, Mile End Road, London E1 4NS, United Kingdom, Central Laser Facility, Science & Technology Facilities Council, Rutherford Appleton Laboratory, Didcot, Oxfordshire OX11 0QX, United Kingdom, and J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, Dolejškova 3, CZ-182 23 Prague, Czech Republic
| | - Mike Towrie
- School of Biological and Chemical Sciences, Queen Mary, University of London, Mile End Road, London E1 4NS, United Kingdom, Central Laser Facility, Science & Technology Facilities Council, Rutherford Appleton Laboratory, Didcot, Oxfordshire OX11 0QX, United Kingdom, and J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, Dolejškova 3, CZ-182 23 Prague, Czech Republic
| | - Stanislav Záliš
- School of Biological and Chemical Sciences, Queen Mary, University of London, Mile End Road, London E1 4NS, United Kingdom, Central Laser Facility, Science & Technology Facilities Council, Rutherford Appleton Laboratory, Didcot, Oxfordshire OX11 0QX, United Kingdom, and J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, Dolejškova 3, CZ-182 23 Prague, Czech Republic
| | - Antonín Vlček
- School of Biological and Chemical Sciences, Queen Mary, University of London, Mile End Road, London E1 4NS, United Kingdom, Central Laser Facility, Science & Technology Facilities Council, Rutherford Appleton Laboratory, Didcot, Oxfordshire OX11 0QX, United Kingdom, and J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, Dolejškova 3, CZ-182 23 Prague, Czech Republic
| |
Collapse
|
7
|
Maçôas EMS, Kananavicius R, Myllyperkiö P, Pettersson M, Kunttu H. Ultrafast Electronic and Vibrational Energy Relaxation of Fe(acetylacetonate)3 in Solution. J Phys Chem A 2007; 111:2054-61. [PMID: 17295455 DOI: 10.1021/jp066271z] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Transient mid-infrared spectroscopy is used to probe the dynamics initiated by excitation of ligand-to-metal (400 nm) and metal-to-ligand (345 nm) charge transfer states of FeIII complexed with acetylacetonate (Fe(acac)3, where acac stands for deprotonated anion of acetylacetone) in solution. Transient spectra in the 1500-1600 cm-1 range show two broad absorptions red-shifted from the bleach of the nu(CO) (approximately 1575 cm-1) and nu(C=C) (approximately 1525 cm-1) ground state absorptions. Bleach recovery kinetics has a time constant of 12-19 ps in chloroform and tetrachloroethylene and it decreases by 30-40% in a 10% mixture of methanol in tetrachloroethylene. The transient absorptions experience band narrowing simultaneously with blue-shifting of the absorption maxima. Both phenomena have time constants of 3-9 ps with no evident dependence on the solvent. The experimental observations are ascribed to fast conversion of the initially excited charge transfer states to the ligand field manifold, and subsequent vibrational cooling on the lowest ligand field excited state prior to electronic conversion to the ground state. The analysis of time dependent bandwidths and positions of the transient absorptions provides some evidence of mode specific vibrational cooling.
Collapse
Affiliation(s)
- Ermelinda M S Maçôas
- Nanoscience Center, Department of Chemistry, P.O. Box 35, FI-40014 University of Jyväskylä, Finland
| | | | | | | | | |
Collapse
|
8
|
Lehtovuori V, Myllyperkiö P, Linnanto J, Manzoni C, Polli D, Cerullo G, Haukka M, Korppi-Tommola J. Study of Mechanisms of Light-Induced Dissociation of Ru(dcbpy)(CO)2I2 in Solution down to 20 fs Time Resolution. J Phys Chem B 2005; 109:17538-44. [PMID: 16853243 DOI: 10.1021/jp044735s] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Mechanisms of the light-induced ligand exchange reaction of (trans-I) Ru(dcbpy)(CO)2I2 (dcbpy = 4,4'-dicarboxylic acid-2,2'-bipyridine) in ethanol have been studied by transient absorption spectroscopy. Ultraviolet 20 fs excitation pulses centered at 325 nm were used to populate a vibrationally hot excited pi bipyridyl state of the reactant that quickly relaxes to a dissociative Ru-I state resulting in the release of one of the carbonyl groups. Quantum yield measurements have indicated that about 40% of the initially exited reactant molecules form the final photoproduct. A 62 fs rise component in the transient absorption (TA) signal was observed at all probe wavelengths in the visible region for the ongoing reaction, while the rise for the photoproduct was pulse limited (20 fs). We assign the observed 62 fs time component to the depopulation of the repulsive CO dissociative state. Vibrational coherences of the TA signals were observed at a wavenumber of 90 cm(-1). The resolved frequency, typical of I-Ru-I vibrational modes, is assigned to trans-cis isomerization of the iodines of the five-coordinated intermediate and damping of this oscillation in 500 fs to simultaneous solvent coordination. Cooling of the hot reactant and the product molecules occurs on a much slower time scale from 4 to 270 ps (Lehtovuori, V.; Aumanen, J.; Myllyperkiö, P.; Rini, M.; Nibbering, E. T. J.; Korppi-Tommola, J. J. Phys. Chem. A 2004, 108, 1644).
Collapse
Affiliation(s)
- Viivi Lehtovuori
- Department of Chemistry Nanoscience Center, P.O. Box 35, FIN-40014, University of Jyväskylä, Finland.
| | | | | | | | | | | | | | | |
Collapse
|
9
|
Nibbering ETJ, Fidder H, Pines E. ULTRAFAST CHEMISTRY: Using Time-Resolved Vibrational Spectroscopy for Interrogation of Structural Dynamics. Annu Rev Phys Chem 2005; 56:337-67. [PMID: 15796704 DOI: 10.1146/annurev.physchem.56.092503.141314] [Citation(s) in RCA: 257] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Time-resolved infrared (IR) and Raman spectroscopy elucidates molecular structure evolution during ultrafast chemical reactions. Following vibrational marker modes in real time provides direct insight into the structural dynamics, as is evidenced in studies on intramolecular hydrogen transfer, bimolecular proton transfer, electron transfer, hydrogen bonding during solvation dynamics, bond fission in organometallic compounds and heme proteins, cis-trans isomerization in retinal proteins, and transformations in photochromic switch pairs. Femtosecond IR spectroscopy monitors the site-specific interactions in hydrogen bonds. Conversion between excited electronic states can be followed for intramolecular electron transfer by inspection of the fingerprint IR- or Raman-active vibrations in conjunction with quantum chemical calculations. Excess internal vibrational energy, generated either by optical excitation or by internal conversion from the electronic excited state to the ground state, is observable through transient frequency shifts of IR-active vibrations and through nonequilibrium populations as deduced by Raman resonances.
Collapse
Affiliation(s)
- Erik T J Nibbering
- Max Born Institut für Nichtlineare Optik und Kurzzeitspektroskopie, D-12489 Berlin, Germany.
| | | | | |
Collapse
|