101
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Iwamura M, Wakabayashi R, Maeba J, Nozaki K, Takeuchi S, Tahara T. Coherent vibration and ultrafast dynamics upon bond formation in excited dimers of an Au(i) complex. Phys Chem Chem Phys 2016; 18:5103-7. [DOI: 10.1039/c5cp06651d] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Au–Au bond strengthening in photoexcited dimers of an Au(i) complex is captured in solution as oscillations of femtosecond absorption signals.
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Affiliation(s)
- Munetaka Iwamura
- Graduate School of Science and Engineering
- University of Toyama
- Toyama 930-8555
- Japan
| | - Ryo Wakabayashi
- Graduate School of Science and Engineering
- University of Toyama
- Toyama 930-8555
- Japan
| | - Junichi Maeba
- Graduate School of Science and Engineering
- University of Toyama
- Toyama 930-8555
- Japan
| | - Koichi Nozaki
- Graduate School of Science and Engineering
- University of Toyama
- Toyama 930-8555
- Japan
| | - Satoshi Takeuchi
- Molecular Spectroscopy Laboratory
- RIKEN
- Wako
- Japan
- Ultrafast Spectroscopy Research Team
| | - Tahei Tahara
- Molecular Spectroscopy Laboratory
- RIKEN
- Wako
- Japan
- Ultrafast Spectroscopy Research Team
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102
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Du L, Lan Z. Ultrafast structural flattening motion in photoinduced excited state dynamics of a bis(diimine) copper(i) complex. Phys Chem Chem Phys 2016; 18:7641-50. [DOI: 10.1039/c5cp06861d] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The intriguing ultrafast photoinduced structural change dynamics of a prototypical Cu(i) complex, namely, [Cu(dmp)2]+ (dmp = 2,9-dimethyl-1,10-phenanthroline), is investigated based on the theoretical analysis of static and dynamical calculations at the all-atomic level.
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Affiliation(s)
- Likai Du
- Key Laboratory of Biobased Materials
- Qingdao Institute of Bioenergy and Bioprocess Technology
- Chinese Academy of Sciences
- Qingdao
- People's Republic of China
| | - Zhenggang Lan
- Key Laboratory of Biobased Materials
- Qingdao Institute of Bioenergy and Bioprocess Technology
- Chinese Academy of Sciences
- Qingdao
- People's Republic of China
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103
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Tahara S, Takeuchi S, Abe-Yoshizumi R, Inoue K, Ohtani H, Kandori H, Tahara T. Ultrafast photoreaction dynamics of a light-driven sodium-ion-pumping retinal protein from Krokinobacter eikastus revealed by femtosecond time-resolved absorption spectroscopy. J Phys Chem Lett 2015; 6:4481-4486. [PMID: 26582475 DOI: 10.1021/acs.jpclett.5b01994] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We report the first femtosecond time-resolved absorption study on ultrafast photoreaction dynamics of a recently discovered retinal protein, KR2, which functions as a light-driven sodium-ion pump. The obtained data show that the excited-state absorption around 460 nm and the stimulated emission around 720 nm decay concomitantly with a time constant of 180 fs. This demonstrates that the deactivation of the S1 state of KR2, which involves isomerization of the retinal chromophore, takes place three times faster than that of bacteriorhodopsin. In accordance with this rapid electronic relaxation, the photoproduct band assignable to the J intermediate grows up at ∼620 nm, indicating that the J intermediate is directly formed with the S1 → S0 internal conversion. The photoproduct band subsequently exhibits a ∼30 nm blue shift with a 500 fs time constant, corresponding to the conversion to the K intermediate. On the basis of the femtosecond absorption data obtained, we discuss the mechanism for the rapid photoreaction of KR2 and its relevance to the unique function of the sodium-ion pump.
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Affiliation(s)
- Shinya Tahara
- Molecular Spectroscopy Laboratory, RIKEN , 2-1 Hirosawa, Wako 351-0198, Japan
- Graduate School of Bioscience and Biotechnology, Tokyo Institute of Technology , Yokohama 226-8501, Japan
| | - Satoshi Takeuchi
- Molecular Spectroscopy Laboratory, RIKEN , 2-1 Hirosawa, Wako 351-0198, Japan
- Ultrafast Spectroscopy Research Team, RIKEN Center for Advanced Photonics (RAP), RIKEN , 2-1 Hirosawa, Wako 351-0198, Japan
| | - Rei Abe-Yoshizumi
- Department of Frontier Materials, Nagoya Institute of Technology , Showa-ku, Nagoya 466-8555, Japan
| | - Keiichi Inoue
- Department of Frontier Materials, Nagoya Institute of Technology , Showa-ku, Nagoya 466-8555, Japan
- OptoBioTechnology Research Center, Nagoya Institute of Technology , Showa-ku, Nagoya 466-8555, Japan
- PRESTO, Japan Science and Technology Agency , 4-1-8 Honcho Kawaguchi, Saitama 332-0012, Japan
| | - Hiroyuki Ohtani
- Graduate School of Bioscience and Biotechnology, Tokyo Institute of Technology , Yokohama 226-8501, Japan
| | - Hideki Kandori
- Department of Frontier Materials, Nagoya Institute of Technology , Showa-ku, Nagoya 466-8555, Japan
- OptoBioTechnology Research Center, Nagoya Institute of Technology , Showa-ku, Nagoya 466-8555, Japan
| | - Tahei Tahara
- Molecular Spectroscopy Laboratory, RIKEN , 2-1 Hirosawa, Wako 351-0198, Japan
- Ultrafast Spectroscopy Research Team, RIKEN Center for Advanced Photonics (RAP), RIKEN , 2-1 Hirosawa, Wako 351-0198, Japan
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104
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Knowles KE, Nelson HD, Kilburn TB, Gamelin DR. Singlet-Triplet Splittings in the Luminescent Excited States of Colloidal Cu(+):CdSe, Cu(+):InP, and CuInS2 Nanocrystals: Charge-Transfer Configurations and Self-Trapped Excitons. J Am Chem Soc 2015; 137:13138-47. [PMID: 26389577 DOI: 10.1021/jacs.5b08547] [Citation(s) in RCA: 100] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The electronic and magnetic properties of the luminescent excited states of colloidal Cu(+):CdSe, Cu(+):InP, and CuInS2 nanocrystals were investigated using variable-temperature photoluminescence (PL) and magnetic circularly polarized luminescence (MCPL) spectroscopies. The nanocrystal electronic structures were also investigated by absorption and magnetic circular dichroism (MCD) spectroscopies. By every spectroscopic measure, the luminescent excited states of all three materials are essentially indistinguishable. All three materials show very similar broad PL line widths and large Stokes shifts. All three materials also show similar temperature dependence of their PL lifetimes and MCPL polarization ratios. Analysis shows that this temperature dependence reflects Boltzmann population distributions between luminescent singlet and triplet excited states with average singlet-triplet splittings of ∼1 meV in each material. These similarities lead to the conclusion that the PL mechanism in CuInS2 NCs is fundamentally different from that of bulk CuInS2 and instead is the same as that in Cu(+)-doped NCs, which are known to luminesce via charge-transfer recombination of conduction-band electrons with copper-localized holes. The luminescence of CuInS2 nanocrystals is explained well by invoking exciton self-trapping, in which delocalized photogenerated holes contract in response to strong vibronic coupling at lattice copper sites to form a luminescent excited state that is essentially identical to that of the Cu(+)-doped semiconductor nanocrystals.
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Affiliation(s)
- Kathryn E Knowles
- Department of Chemistry, University of Washington , Seattle, Washington 98195-1700, United States
| | - Heidi D Nelson
- Department of Chemistry, University of Washington , Seattle, Washington 98195-1700, United States
| | - Troy B Kilburn
- Department of Chemistry, University of Washington , Seattle, Washington 98195-1700, United States
| | - Daniel R Gamelin
- Department of Chemistry, University of Washington , Seattle, Washington 98195-1700, United States
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105
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Mara MW, Bowman DN, Buyukcakir O, Shelby ML, Haldrup K, Huang J, Harpham MR, Stickrath AB, Zhang X, Stoddart JF, Coskun A, Jakubikova E, Chen LX. Electron Injection from Copper Diimine Sensitizers into TiO2: Structural Effects and Their Implications for Solar Energy Conversion Devices. J Am Chem Soc 2015; 137:9670-84. [PMID: 26154849 DOI: 10.1021/jacs.5b04612] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Copper(I) diimine complexes have emerged as low cost replacements for ruthenium complexes as light sensitizers and electron donors, but their shorter metal-to-ligand-charge-transfer (MLCT) states lifetimes and lability of transient Cu(II) species impede their intended functions. Two carboxylated Cu(I) bis-2,9-diphenylphenanthroline (dpp) complexes [Cu(I)(dpp-O(CH2CH2O)5)(dpp-(COOH)2)](+) and [Cu(I)(dpp-O(CH2CH2O)5)(dpp-(Φ-COOH)2)](+) (Φ = tolyl) with different linker lengths were synthesized in which the MLCT-state solvent quenching pathways are effectively blocked, the lifetime of the singlet MLCT state is prolonged, and the transient Cu(II) ligands are stabilized. Aiming at understanding the mechanisms of structural influence to the interfacial charge transfer in the dye-sensitized solar cell mimics, electronic and geometric structures as well as dynamics for the MLCT state of these complexes and their hybrid with TiO2 nanoparticles were investigated using optical transient spectroscopy, X-ray transient absorption spectroscopy, time-dependent density functional theory, and quantum dynamics simulations. The combined results show that these complexes exhibit strong absorption throughout the visible spectrum due to the severely flattened ground state, and a long-lived charge-separated Cu(II) has been achieved via ultrafast electron injection (<300 fs) from the (1)MLCT state into TiO2 nanoparticles. The results also indicate that the TiO2-phen distance in these systems does not have significant effect on the efficiency of the interfacial electron-transfer process. The mechanisms for electron transfer in these systems are discussed and used to develop new strategies in optimizing copper(I) diimine complexes in solar energy conversion devices.
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Affiliation(s)
- Michael W Mara
- †Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, United States
| | - David N Bowman
- §Department of Chemistry, North Carolina State University, 2620 Yarbrough Drive, Raleigh, North Carolina 27695-8204, United States
| | - Onur Buyukcakir
- ⊥Graduate School of Energy, Environment, Water and Sustainability (EEWS), Korea Advanced Institute of Science and Technology (KAIST), Daejeon 305-701, Republic of Korea
| | - Megan L Shelby
- †Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, United States
| | - Kristoffer Haldrup
- ∥Centre for Molecular Movies, Department of Physics, NEXMAP Section, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark
| | | | | | | | | | - J Fraser Stoddart
- †Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, United States
| | - Ali Coskun
- ⊥Graduate School of Energy, Environment, Water and Sustainability (EEWS), Korea Advanced Institute of Science and Technology (KAIST), Daejeon 305-701, Republic of Korea
| | - Elena Jakubikova
- §Department of Chemistry, North Carolina State University, 2620 Yarbrough Drive, Raleigh, North Carolina 27695-8204, United States
| | - Lin X Chen
- †Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, United States
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106
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Zhou C, Tian Y, Yuan Z, Han M, Wang J, Zhu L, Tameh MS, Huang C, Ma B. Precise Design of Phosphorescent Molecular Butterflies with Tunable Photoinduced Structural Change and Dual Emission. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201505185] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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107
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Zhou C, Tian Y, Yuan Z, Han M, Wang J, Zhu L, Tameh MS, Huang C, Ma B. Precise Design of Phosphorescent Molecular Butterflies with Tunable Photoinduced Structural Change and Dual Emission. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/anie.201505185] [Citation(s) in RCA: 74] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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108
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Capano G, Rothlisberger U, Tavernelli I, Penfold TJ. Theoretical Rationalization of the Emission Properties of Prototypical Cu(I)–Phenanthroline Complexes. J Phys Chem A 2015; 119:7026-37. [DOI: 10.1021/acs.jpca.5b03842] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- G. Capano
- École Polytechnique
Fédérale de Lausanne (EPFL), Laboratoire de spectroscopie
ultrarapide, ISIC, FSB Station
6, CH-1015 Lausanne, Switzerland
- École Polytechnique
Fédérale de Lausanne (EPFL), Laboratoire de chimie et
biochimie computationnelles, ISIC, FSB-BCH, CH-1015 Lausanne, Switzerland
| | - U. Rothlisberger
- École Polytechnique
Fédérale de Lausanne (EPFL), Laboratoire de chimie et
biochimie computationnelles, ISIC, FSB-BCH, CH-1015 Lausanne, Switzerland
| | - I. Tavernelli
- École Polytechnique
Fédérale de Lausanne (EPFL), Laboratoire de chimie et
biochimie computationnelles, ISIC, FSB-BCH, CH-1015 Lausanne, Switzerland
| | - T. J. Penfold
- SwissFEL, Paul Scherrer Institute, CH-5232 Villigen, Switzerland
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109
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Cheng G, So GKM, To WP, Chen Y, Kwok CC, Ma C, Guan X, Chang X, Kwok WM, Che CM. Luminescent zinc(ii) and copper(i) complexes for high-performance solution-processed monochromic and white organic light-emitting devices. Chem Sci 2015; 6:4623-4635. [PMID: 29142704 PMCID: PMC5667404 DOI: 10.1039/c4sc03161j] [Citation(s) in RCA: 120] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2014] [Accepted: 05/15/2015] [Indexed: 12/21/2022] Open
Abstract
The synthesis and spectroscopic properties of luminescent tetranuclear zinc(ii) complexes of substituted 7-azaindoles and a series of luminescent copper(i) complexes containing 7,8-bis(diphenylphosphino)-7,8-dicarba-nido-undecaborate ligand are described. These complexes are stable towards air and moisture. Thin film samples of the luminescent copper(i) complexes in 2,6-dicarbazolo-1,5-pyridine and zinc(ii) complexes in poly(methyl methacrylate) showed emission quantum yields of up to 0.60 (for Cu-3) and 0.96 (for Zn-1), respectively. Their photophysical properties were examined by ultrafast time-resolved emission spectroscopy, temperature dependent emission lifetime measurements and density functional theory calculations. Monochromic blue and orange solution-processed OLEDs with these Zn(ii) and Cu(i) complexes as light-emitting dopants have been fabricated, respectively. Maximum external quantum efficiency (EQE) of 5.55% and Commission Internationale de l'Eclairage (CIE) coordinates of (0.16, 0.19) were accomplished with the optimized Zn-1-OLED while these values were, respectively 15.64% and (0.48, 0.51) for the optimized Cu-3-OLED. Solution-processed white OLEDs having maximum EQE of 6.88%, CIE coordinates of (0.42, 0.44), and colour rendering index of 81 were fabricated by using these luminescent Zn(ii) and Cu(i) complexes as blue and orange light-emitting dopant materials, respectively.
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Affiliation(s)
- Gang Cheng
- State Key Laboratory of Synthetic Chemistry , HKU-CAS Joint Laboratory on New Materials, and Department of Chemistry , The University of Hong Kong , Pokfulam Road , Hong Kong SAR , China . .,HKU Shenzhen Institute of Research and Innovation , Shenzhen 518053 , China.,State Key Laboratory on Integrated Optoelectronics , College of Electronic Science and Engineering , Jilin University , Changchun 130012 , China
| | - Gary Kwok-Ming So
- State Key Laboratory of Synthetic Chemistry , HKU-CAS Joint Laboratory on New Materials, and Department of Chemistry , The University of Hong Kong , Pokfulam Road , Hong Kong SAR , China .
| | - Wai-Pong To
- State Key Laboratory of Synthetic Chemistry , HKU-CAS Joint Laboratory on New Materials, and Department of Chemistry , The University of Hong Kong , Pokfulam Road , Hong Kong SAR , China .
| | - Yong Chen
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials , Technical Institute of Physics and Chemistry , Chinese Academy of Sciences , Beijing 100190 , China
| | - Chi-Chung Kwok
- State Key Laboratory of Synthetic Chemistry , HKU-CAS Joint Laboratory on New Materials, and Department of Chemistry , The University of Hong Kong , Pokfulam Road , Hong Kong SAR , China . .,HKU Shenzhen Institute of Research and Innovation , Shenzhen 518053 , China
| | - Chensheng Ma
- State Key Laboratory of Synthetic Chemistry , HKU-CAS Joint Laboratory on New Materials, and Department of Chemistry , The University of Hong Kong , Pokfulam Road , Hong Kong SAR , China . .,School of Chemistry and Chemical Engineering , Shenzhen University , Shenzhen 518060 , China
| | - Xiangguo Guan
- State Key Laboratory of Synthetic Chemistry , HKU-CAS Joint Laboratory on New Materials, and Department of Chemistry , The University of Hong Kong , Pokfulam Road , Hong Kong SAR , China .
| | - Xiaoyong Chang
- State Key Laboratory of Synthetic Chemistry , HKU-CAS Joint Laboratory on New Materials, and Department of Chemistry , The University of Hong Kong , Pokfulam Road , Hong Kong SAR , China .
| | - Wai-Ming Kwok
- Department of Applied Biology and Chemical Technology , The Hong Kong Polytechnic University , Hung Hom, Kowloon , Hong Kong SAR , China
| | - Chi-Ming Che
- State Key Laboratory of Synthetic Chemistry , HKU-CAS Joint Laboratory on New Materials, and Department of Chemistry , The University of Hong Kong , Pokfulam Road , Hong Kong SAR , China . .,HKU Shenzhen Institute of Research and Innovation , Shenzhen 518053 , China
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110
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Huang D, Zou Y, Jiao F, Zhang F, Zang Y, Di CA, Xu W, Zhu D. Interface-Located Photothermoelectric Effect of Organic Thermoelectric Materials in Enabling NIR Detection. ACS APPLIED MATERIALS & INTERFACES 2015; 7:8968-8973. [PMID: 25875974 DOI: 10.1021/acsami.5b01460] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Organic photothermoelectric (PTE) materials are promising candidates for various photodetection applications. Herein, we report on poly[Cux(Cu-ett)]:PVDF, which is an excellent polymeric thermoelectric composite, possesses unprecedented PTE properties. The NIR light irradiation on the poly[Cu(x)(Cu-ett)]:PVDF film could induce obvious enhancement in Seebeck coefficient from 52 ± 1.5 to 79 ± 5.0 μV/K. By taking advantage of prominent photothermoelectric effect of poly[Cu(x)(Cu-ett)]:PVDF, an unprecedented voltage of 12 mV was obtained. This excellent performance enables its promising applications in electricity generation from solar energy and NIR detection to a wide range of light intensities ranging from 1.7 mW/cm(2) to 17 W/cm(2).
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Affiliation(s)
- Dazhen Huang
- †Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China
- ‡University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Ye Zou
- ‡University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Fei Jiao
- †Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China
- ‡University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Fengjiao Zhang
- †Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China
- ‡University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Yaping Zang
- †Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China
- ‡University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Chong-an Di
- †Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China
| | - Wei Xu
- †Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China
| | - Daoben Zhu
- †Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China
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111
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Czerwieniec R, Yersin H. Diversity of copper(I) complexes showing thermally activated delayed fluorescence: basic photophysical analysis. Inorg Chem 2015; 54:4322-7. [PMID: 25894718 DOI: 10.1021/ic503072u] [Citation(s) in RCA: 127] [Impact Index Per Article: 14.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
A comparison of three copper(I) compounds [1, Cu(dppb)(pz2Bph2); 2, Cu(pop)(pz2Bph2); 3, Cu(dmp)(phanephos)(+)] that show pronounced thermally activated delayed fluorescence (TADF) at ambient temperature demonstrates a wide diversity of emission behavior. In this study, we focus on compound 1. A computational density functional theory (DFT)/time-dependent DFT approach allows us to predict detailed photophysical properties, while experimental emission studies over a wide temperature range down to T = 1.5 K lead to better insight into the electronic structures even with respect to spin-orbit coupling efficiencies, radiative rates, and zero-field splitting of the triplet state. All three compounds, with emission quantum yields higher than ϕPL = 70%, are potentially well suited as emitters for organic light-emitting diodes (OLEDs) based on the singlet-harvesting mechanism. Interestingly, compound 1 is by far the most attractive one because of a very small energy separation between the lowest excited singlet S1 and triplet T1 state of ΔE(S1-T1) = 370 cm(-1) (46 meV). Such a small value has not been reported so far. It is responsible for the very short decay time of τ(TADF, 300 K) = 3.3 μs. Hence, if focused on the requirements of a short TADF decay time for reduction of the saturation effects in OLEDs, copper(I) complexes are well comparable or even slightly better than the best purely organic TADF emitters.
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Affiliation(s)
- Rafał Czerwieniec
- Institut für Physikalische und Theoretische Chemie, Universität Regensburg, 93053 Regensburg, Germany
| | - Hartmut Yersin
- Institut für Physikalische und Theoretische Chemie, Universität Regensburg, 93053 Regensburg, Germany
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112
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Vibrational coherence transfer in an electronically decoupled molecular dyad. Sci Rep 2015; 5:9368. [PMID: 25797419 PMCID: PMC4369738 DOI: 10.1038/srep09368] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2014] [Accepted: 03/02/2015] [Indexed: 11/08/2022] Open
Abstract
The ring opening of a dithienylethene photoswitch incorporated in a bridged boron-dipyrromethene - dithienylethene molecular dyad was investigated with ultrafast spectroscopy. Coherent vibrations in the electronic ground state of the boron-dipyrromethene are triggered after selective photoexcitation of the closed dithienylethene indicating vibrational coupling although the two moieties are electronically isolated. A distribution of short-lived modes and a long-lived mode at 143 cm(-1) are observed. Analysis of the theoretical frequency spectrum indicates two modes at 97 cm(-1) and 147 cm(-1) which strongly modulate the electronic transition energy. Both modes exhibit a characteristic displacement of the bridge suggesting that the mechanical momentum of the initial geometry change after photoexcitation of the dithienylethene is transduced to the boron-dipyrromethene. The relaxation to the dithienylethene electronic ground state is accompanied by significant heat dissipation into the surrounding medium. In the investigated dyad, the boron-dipyrromethene acts as probe for the ultrafast photophysical processes in the dithienylethene.
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113
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Wächtler M, Guthmuller J, Kupfer S, Maiuri M, Brida D, Popp J, Rau S, Cerullo G, Dietzek B. Ultrafast Intramolecular Relaxation and Wave-Packet Motion in a Ruthenium-Based Supramolecular Photocatalyst. Chemistry 2015; 21:7668-74. [DOI: 10.1002/chem.201406350] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2014] [Indexed: 11/05/2022]
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114
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Garakyaraghi S, Danilov EO, McCusker CE, Castellano FN. Transient absorption dynamics of sterically congested Cu(I) MLCT excited states. J Phys Chem A 2015; 119:3181-93. [PMID: 25751569 DOI: 10.1021/acs.jpca.5b00901] [Citation(s) in RCA: 80] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Subpicosecond through supra-nanosecond transient absorption dynamics of the homoleptic Cu(I) metal-to-ligand charge transfer (MLCT) photosensitizers including the benchmark [Cu(dmp)2](+) (dmp =2,9-dimethyl-1,10-phenanthroline) chromophore, as well as [Cu(dsbp)2](+) (dsbp =2,9-di(sec-butyl)-1,10-phenanthroline and [Cu(dsbtmp)2](+) (dsbtmp =2,9-di(sec-butyl)-3,4,7,8-tetramethyl-1,10-phenanthroline) were investigated in dichloromethane and tetrahydrofuran solutions. Visible and near-IR spectroelectrochemical measurements of the singly reduced [Cu(dsbp)2](+) and [Cu(dsbtmp)2](+) species were determined in tetrahydrofuran, allowing for the identification of redox-specific phenanthroline-based radical anion spectroscopic signatures prevalent in the respective transient absorption experiments. This study utilized four different excitation wavelengths (418, 470, 500, and 530 nm) to elucidate dynamics on ultrafast times scales spanning probe wavelengths ranging from the UV to the near-IR (350 to 1450 nm). With the current time resolution of ∼150 fs, initial excited state decay in all three compounds was found to be independent of excitation wavelength. Not surprisingly, there was little to no observed influence of solvent in the initial stages of excited state decay in any of these molecules including [Cu(dmp)2](+), consistent with results from previous investigators. The combined experimental data revealed two ranges of time constants observed on short time scales in all three MLCT chromophores and both components lengthen as a function of structure in the following manner: [Cu(dsbtmp)2](+) < [Cu(dsbp)2](+) < [Cu(dmp)2](+). The molecule with the most inhibited potential for distortion, [Cu(dsbtmp)2](+), possessed the fastest ultrafast dynamics as well as the longest excited state lifetimes in both solvents. These results are consistent with a small degree of excited state distortion, rapid intersystem crossing, and weak vibronic coupling to the ground state. The concomitant systematic variation in both initial time constants, assigned to pseudo-Jahn-Teller distortion and intersystem crossing, suggest that both processes are intimately coupled in all molecules in the series. The variability in these time scales illustrate that strongly impeded structural distortion in Cu(I) MLCT excited state enables more rapid surface crossings in the initial deactivation dynamics.
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Affiliation(s)
- Sofia Garakyaraghi
- Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695-8204, United States
| | - Evgeny O Danilov
- Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695-8204, United States
| | - Catherine E McCusker
- Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695-8204, United States
| | - Felix N Castellano
- Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695-8204, United States
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115
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Iwamura M, Takeuchi S, Tahara T. Ultrafast excited-state dynamics of copper(I) complexes. Acc Chem Res 2015; 48:782-91. [PMID: 25646861 DOI: 10.1021/ar500353h] [Citation(s) in RCA: 149] [Impact Index Per Article: 16.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Bis-diimine Cu(I) complexes exhibit strong absorption in the visible region owing to the metal-to-ligand charge transfer (MLCT) transitions, and the triplet MLCT ((3)MLCT) states have long lifetimes. Because these characteristics are highly suitable for photosensitizers and photocatalysts, bis-diimine Cu(I) complexes have been attracting much interest. An intriguing feature of the Cu(I) complexes is the photoinduced structural change called "flattening". Bis-diimine Cu(I) complexes usually have tetrahedron-like D2d structures in the ground (S0) state, in which two ligands are perpendicularly attached to the Cu(I) ion. With MLCT excitation, the central Cu(I) ion is formally oxidized to Cu(II), which induces the structural change to the "flattened" square-planar-like structure that is seen for usual Cu(II) complexes. In this Account, we review our recent studies on ultrafast excited-state dynamics of bis-diimine Cu(I) complexes carried out using femtosecond time-resolved optical spectroscopy. Focusing on three prototypical bis-diimine Cu(I) complexes that have 1,10-phenanthroline ligands with different substituents at the 2,9-positions, i.e., [Cu(phen)2](+) (phen = 1,10-phenanthroline), [Cu(dmphen)2](+) (dmphen = 2,9-dimethyl-1,10-phenanthroline), and [Cu(dpphen)2](+) (dpphen = 2,9-diphenyl-1,10-phenanthroline), we examined their excited-state dynamics by time-resolved emission and absorption spectroscopies with 200 fs time resolution, observed the excited-state coherent nuclear motion with 30 fs time resolution and performed complementary theoretical calculations. This combined approach vividly visualizes excited-state processes in the MLCT state of bis-diimine Cu(I) complexes. It was demonstrated that flattening distortion, internal conversion, and intersystem crossing occur on the femtosecond-early picosecond time scale, and their dynamics is clearly identified separately. The flattening distortion predominantly occurs in the S1 state on the subpicosecond time-scale, and the precursor S1 state retaining the initial undistorted structure appears as a metastable state before the structural change. This observation indicates that the traditional understanding based on the Jahn-Teller effect appears irrelevant for realistically discussing the photoinduced structural change of bis-diimine Cu(I) complexes. The lifetime of the precursor S1 state significantly depends on the substituents in the three complexes, indicating that the flattering distortion requires a longer time as the substituents at 2,9-positions of the ligands become bulkier. It is suggested that the substituents are rotated to avoid steric repulsions to achieve the flattened structure at the global minimum of the S1 state, implying the necessity of discussion based on a multidimensional potential energy surface to properly consider this excited-state structural change. After the flattening distortion, the S1 states of [Cu(dmphen)2](+) and [Cu(dpphen)2](+), which have bulky substituents, relax to the T1 state by intersystem crossing on the ∼10 ps time scale, while the flattened S1 state of [Cu(phen)2](+) relaxes directly to the S0 state on the ∼2 ps time scale. This difference is rationalized in terms of the different magnitude of the flattening distortion and relevant changes in the potential energy surfaces. Clear understanding of the ultrafast excited-state process provides a solid basis for designing and using Cu(I) complexes, such as controlling the structural change to efficiently utilize the energy of the MLCT state in solar energy conversion.
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Affiliation(s)
- Munetaka Iwamura
- Department
of Chemistry, University of Toyama, 3190 Gofuku, Toyama 930-8555, Japan
| | - Satoshi Takeuchi
- Molecular
Spectroscopy Laboratory, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Ultrafast
Spectroscopy Research Team, RIKEN Center for Advanced Photonics (RAP), 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Tahei Tahara
- Molecular
Spectroscopy Laboratory, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Ultrafast
Spectroscopy Research Team, RIKEN Center for Advanced Photonics (RAP), 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
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116
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Hofbeck T, Monkowius U, Yersin H. Highly efficient luminescence of Cu(I) compounds: thermally activated delayed fluorescence combined with short-lived phosphorescence. J Am Chem Soc 2015; 137:399-404. [PMID: 25486064 DOI: 10.1021/ja5109672] [Citation(s) in RCA: 268] [Impact Index Per Article: 29.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Luminescent materials showing thermally activated delayed fluorescence (TADF) have gained high attractiveness as emitters in organic light emitting diodes (OLEDs) and other photonic applications. Nevertheless, even utilization of TADF can be further improved, introducing a novel concept. This is demonstrated by a new class of brightly luminescent low-cost Cu(I) compounds, for which the emission stems from both the lowest excited triplet T1 and singlet S1 state. At T = 300 K, these materials exhibit quantum yields of more than ΦPL = 90% at short emission decay times. About 80% of the emission intensity stems from the singlet due to TADF, but importantly, an additional 20% is contributed by the lower lying triplet state according to effective spin-orbit coupling (SOC). SOC induces also a relatively large zero-field splitting of the triplet being unusual for Cu(I) complexes. Thus, the overall emission decay time is distinctly reduced. Combined use of both decay paths opens novel photonic applications, in particular, for OLEDs.
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Affiliation(s)
- Thomas Hofbeck
- Institut für Physikalische Chemie, Universität Regensburg , D-93053 Regensburg, Germany
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117
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Mara MW, Fransted KA, Chen LX. Interplays of excited state structures and dynamics in copper(I) diimine complexes: Implications and perspectives. Coord Chem Rev 2015. [DOI: 10.1016/j.ccr.2014.06.013] [Citation(s) in RCA: 116] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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118
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Kang L, Chen J, Teng T, Chen XL, Yu R, Lu CZ. Experimental and theoretical studies of highly emissive dinuclear Cu(i) halide complexes with delayed fluorescence. Dalton Trans 2015; 44:11649-59. [DOI: 10.1039/c5dt01292a] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Experimental and theoretical studies of the photophysical properties of three novel emissive dinuclear Cu(i) halide complexes with thermally activated delayed fluorescence (TADF) are reported.
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Affiliation(s)
- Liju Kang
- State Key Laboratory of Structural Chemistry
- Fujian Institute of Research on the Structure of Matter
- Chinese Academy of Sciences
- Fuzhou
- China
| | - Jin Chen
- College of Life Science
- University of Fujian Agriculture and Forestry
- Fuzhou
- China
| | - Teng Teng
- State Key Laboratory of Structural Chemistry
- Fujian Institute of Research on the Structure of Matter
- Chinese Academy of Sciences
- Fuzhou
- China
| | - Xu-Lin Chen
- State Key Laboratory of Structural Chemistry
- Fujian Institute of Research on the Structure of Matter
- Chinese Academy of Sciences
- Fuzhou
- China
| | - Rongmin Yu
- State Key Laboratory of Structural Chemistry
- Fujian Institute of Research on the Structure of Matter
- Chinese Academy of Sciences
- Fuzhou
- China
| | - Can-Zhong Lu
- State Key Laboratory of Structural Chemistry
- Fujian Institute of Research on the Structure of Matter
- Chinese Academy of Sciences
- Fuzhou
- China
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119
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Hua L, Iwamura M, Takeuchi S, Tahara T. The substituent effect on the MLCT excited state dynamics of Cu(i) complexes studied by femtosecond time-resolved absorption and observation of coherent nuclear wavepacket motion. Phys Chem Chem Phys 2015; 17:2067-77. [DOI: 10.1039/c4cp03843f] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Ultrafast absorption spectroscopy clarified excited-state dynamics of bis-diimine copper(i) complexes, highlighting the substituent effect on the ultrafast process of the 1MLCT state.
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Affiliation(s)
| | | | - Satoshi Takeuchi
- Molecular Spectroscopy Laboratory
- RIKEN
- Wako
- Japan
- Ultrafast Spectroscopy Research Team
| | - Tahei Tahara
- Molecular Spectroscopy Laboratory
- RIKEN
- Wako
- Japan
- Ultrafast Spectroscopy Research Team
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120
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Bertoni R, Lorenc M, Tissot A, Boillot ML, Collet E. Femtosecond photoswitching dynamics and microsecond thermal conversion driven by laser heating in FeIII spin-crossover solids. Coord Chem Rev 2015. [DOI: 10.1016/j.ccr.2014.05.024] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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121
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Fujisawa T, Takeuchi S, Masuda S, Tahara T. Signaling-State Formation Mechanism of a BLUF Protein PapB from the Purple Bacterium Rhodopseudomonas palustris Studied by Femtosecond Time-Resolved Absorption Spectroscopy. J Phys Chem B 2014; 118:14761-73. [PMID: 25406769 DOI: 10.1021/jp5076252] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We studied the signaling-state formation of a BLUF (blue light using FAD) protein, PapB, from the purple bacterium Rhodopseudomonas palustris, using femtosecond time-resolved absorption spectroscopy. Upon photoexcitation of the dark state, FADH(•) (neutral flavin semiquinone FADH radical) was observed as the intermediate before the formation of the signaling state. The kinetic analysis based on singular value decomposition showed that FADH(•) mediates the signaling-state formation, showing that PapB is the second example of FADH(•)-mediated formation of the signaling state after Slr1694 (M. Gauden et al. Proc. Natl. Acad. Sci. U.S.A. 2006, 103, 10895-10900). The mechanism of the signaling-state formation is discussed on the basis of the comparison between femtosecond time-resolved absorption spectra of the dark state and those obtained by exciting the signaling state. FADH(•) was observed also with excitation of the signaling state, and surprisingly, the kinetics of FADH(•) was indistinguishable from the case of exciting the dark state. This result suggests that the hydrogen bond environment in the signaling state is realized before the formation of FADH(•) in the photocycle of PapB.
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Affiliation(s)
- Tomotsumi Fujisawa
- Molecular Spectroscopy Laboratory, RIKEN , 2-1 Hirosawa, Wako 351-0198, Japan
| | - Satoshi Takeuchi
- Molecular Spectroscopy Laboratory, RIKEN , 2-1 Hirosawa, Wako 351-0198, Japan.,Ultrafast Spectroscopy Research Team, RIKEN Center for Advanced Photonics (RAP), RIKEN , 2-1 Hirosawa, Wako 351-0198, Japan
| | - Shinji Masuda
- Center for Biological Resources and Informatics, and Earth-Life Science Institute, Tokyo Institute of Technology , Yokohama 226-8501, Japan
| | - Tahei Tahara
- Molecular Spectroscopy Laboratory, RIKEN , 2-1 Hirosawa, Wako 351-0198, Japan.,Ultrafast Spectroscopy Research Team, RIKEN Center for Advanced Photonics (RAP), RIKEN , 2-1 Hirosawa, Wako 351-0198, Japan
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122
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123
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Leitl MJ, Krylova VA, Djurovich PI, Thompson ME, Yersin H. Phosphorescence versus thermally activated delayed fluorescence. Controlling singlet-triplet splitting in brightly emitting and sublimable Cu(I) compounds. J Am Chem Soc 2014; 136:16032-8. [PMID: 25260042 DOI: 10.1021/ja508155x] [Citation(s) in RCA: 256] [Impact Index Per Article: 25.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Photophysical properties of two highly emissive three-coordinate Cu(I) complexes, (IPr)Cu(py2-BMe2) (1) and (Bzl-3,5Me)Cu(py2-BMe2) (2), with two different N-heterocyclic (NHC) ligands were investigated in detail (IPr = 1,3-bis(2,6-diisopropylphenyl)imidazol-2-ylidene; Bzl-3,5Me = 1,3-bis(3,5-dimethylphenyl)-1H-benzo[d]imidazol-2-ylidene; py2-BMe2 = di(2-pyridyl)dimethylborate). The compounds exhibit remarkably high emission quantum yields of more than 70% in the powder phase. Despite similar chemical structures of both complexes, only compound 1 exhibits thermally activated delayed blue fluorescence (TADF), whereas compound 2 shows a pure, yellow phosphorescence. This behavior is related to the torsion angles between the two ligands. Changing this angle has a huge impact on the energy splitting between the first excited singlet state S1 and triplet state T1 and therefore on the TADF properties. In addition, it was found that, in both compounds, spin-orbit coupling (SOC) is particularly effective compared to other Cu(I) complexes. This is reflected in short emission decay times of the triplet states of only 34 μs (1) and 21 μs (2), respectively, as well as in the zero-field splittings of the triplet states amounting to 4 cm(-1) (0.5 meV) for 1 and 5 cm(-1) (0.6 meV) for 2. Accordingly, at ambient temperature, compound 1 exhibits two radiative decay paths which are thermally equilibrated: one via the S1 state as TADF path (62%) and one via the T1 state as phosphorescence path (38%). Thus, if this material is applied in an organic light-emitting diode, the generated excitons are harvested mainly in the singlet state, but to a significant portion also in the triplet state. This novel mechanism based on two separate radiative decay paths reduces the overall emission decay time distinctly.
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Affiliation(s)
- Markus J Leitl
- Institute for Physical Chemistry, University of Regensburg , 93040 Regensburg, Germany
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124
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Capano G, Chergui M, Rothlisberger U, Tavernelli I, Penfold TJ. A quantum dynamics study of the ultrafast relaxation in a prototypical Cu(I)-phenanthroline. J Phys Chem A 2014; 118:9861-9. [PMID: 25275666 DOI: 10.1021/jp509728m] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The ultrafast nonadiabatic dynamics of a prototypical Cu(I)-phenanthroline complex, [Cu(dmp)2](+) (dmp = 2,9-dimethyl-1,10-phenanthroline), initiated after photoexcitation into the optically bright metal-to-ligand charge-transfer (MLCT) state (S3) is investigated using quantum nuclear dynamics. In agreement with recent experimental conclusions, we find that the system undergoes rapid (∼100 fs) internal conversion from S3 into the S2 and S1 states at or near the Franck-Condon (FC) geometry. This is preceded by a dynamic component with a time constant of ∼400 fs, which corresponds to the flattening of the ligands associated with the pseudo Jahn-Teller distortion. Importantly, our simulations demonstrate that this latter aspect is in competition with subpicosecond intersystem crossing (ISC). The mechanism for ISC is shown to be a dynamic effect, in the sense that it arises from the system traversing the pseudo Jahn-Teller coordinate where the singlet and triplet states become degenerate, leading to efficient crossing. These first-principles quantum dynamics simulations, in conjunction with recent experiments, allow us to clearly resolve the mechanistic details of the ultrafast dynamics within [Cu(dmp)2](+), which have been disputed in the literature.
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Affiliation(s)
- G Capano
- Laboratoire de spectroscopie ultrarapide, ISIC, École Polytechnique Fédérale de Lausanne (EPFL) , FSB Station 6, CH-1015 Lausanne, Switzerland
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125
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Tschierlei S, Karnahl M, Rockstroh N, Junge H, Beller M, Lochbrunner S. Substitution-controlled excited state processes in heteroleptic copper(I) photosensitizers used in hydrogen evolving systems. Chemphyschem 2014; 15:3709-13. [PMID: 25236384 DOI: 10.1002/cphc.201402585] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2014] [Indexed: 11/08/2022]
Abstract
Four different heteroleptic [Cu(N^N)(P^P)]PF6 complexes, which combine classical bidentate diimine ligands and sterically demanding diphosphine ligands, are studied by a combination of ultrafast time-resolved spectroscopy and quantum chemical calculations. The light-induced excited state processes, accompanied by a structural change, are discussed with respect to the application of these complexes as a new class of noble-metal-free photosensitizers in proton reducing systems. In particular, the influence of different substituents in the ligand backbone on the photophysical properties is highlighted.
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Affiliation(s)
- Stefanie Tschierlei
- University of Rostock, Institute of Physics, Universitätsplatz 3, 18055 Rostock (Germany).
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126
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Han M, Tian Y, Yuan Z, Zhu L, Ma B. A Phosphorescent Molecular “Butterfly” that undergoes a Photoinduced Structural Change allowing Temperature Sensing and White Emission. Angew Chem Int Ed Engl 2014; 53:10908-12. [DOI: 10.1002/anie.201405293] [Citation(s) in RCA: 119] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2014] [Indexed: 01/06/2023]
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127
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Han M, Tian Y, Yuan Z, Zhu L, Ma B. A Phosphorescent Molecular “Butterfly” that undergoes a Photoinduced Structural Change allowing Temperature Sensing and White Emission. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201405293] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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128
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Kaszub W, Marino A, Lorenc M, Collet E, Bagryanskaya EG, Tretyakov EV, Ovcharenko VI, Fedin MV. Ultrafast Photoswitching in a Copper-Nitroxide-Based Molecular Magnet. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201403672] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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129
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Kaszub W, Marino A, Lorenc M, Collet E, Bagryanskaya EG, Tretyakov EV, Ovcharenko VI, Fedin MV. Ultrafast Photoswitching in a Copper-Nitroxide-Based Molecular Magnet. Angew Chem Int Ed Engl 2014; 53:10636-40. [PMID: 25138683 DOI: 10.1002/anie.201403672] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2014] [Revised: 06/03/2014] [Indexed: 11/09/2022]
Affiliation(s)
- Wawrzyniec Kaszub
- Institut de Physique de Rennes, UMR UR1- CNRS 6251, Universite Rennes 1, 35042 Rennes cedex (France)
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130
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Fransted KA, Jackson NE, Zong R, Mara MW, Huang J, Harpham MR, Shelby ML, Thummel RP, Chen LX. Ultrafast Structural Dynamics of Cu(I)-Bicinchoninic Acid and Their Implications for Solar Energy Applications. J Phys Chem A 2014; 118:10497-506. [DOI: 10.1021/jp504294j] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
- Kelly A. Fransted
- Chemical
Sciences and Engineering Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439-3113, United States
| | - Nicholas E. Jackson
- Department
of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60439, United States
| | - Ruifa Zong
- Department
of Chemistry, University of Houston, 4800 Calhoun Road, Houston, Texas 77204-5003, United States
| | - Michael W. Mara
- Chemical
Sciences and Engineering Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439-3113, United States
- Department
of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60439, United States
| | - Jier Huang
- Chemical
Sciences and Engineering Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439-3113, United States
| | - Michael R. Harpham
- Chemical
Sciences and Engineering Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439-3113, United States
| | - Megan L. Shelby
- Chemical
Sciences and Engineering Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439-3113, United States
- Department
of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60439, United States
| | - Randolph P. Thummel
- Department
of Chemistry, University of Houston, 4800 Calhoun Road, Houston, Texas 77204-5003, United States
| | - Lin X. Chen
- Chemical
Sciences and Engineering Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439-3113, United States
- Department
of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60439, United States
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131
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Fischer S, Hollmann D, Tschierlei S, Karnahl M, Rockstroh N, Barsch E, Schwarzbach P, Luo SP, Junge H, Beller M, Lochbrunner S, Ludwig R, Brückner A. Death and Rebirth: Photocatalytic Hydrogen Production by a Self-Organizing Copper–Iron System. ACS Catal 2014. [DOI: 10.1021/cs500387e] [Citation(s) in RCA: 75] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Steffen Fischer
- Institute
of Chemistry, Department Physical Chemistry, University of Rostock, Dr. Lorenz-Weg 1, 18059 Rostock, Germany
- Leibniz
Institute for Catalysis at the University of Rostock, Albert Einstein-Straße
29a, 18059 Rostock, Germany
| | - Dirk Hollmann
- Leibniz
Institute for Catalysis at the University of Rostock, Albert Einstein-Straße
29a, 18059 Rostock, Germany
| | - Stefanie Tschierlei
- Institute
of Physics, University of Rostock, Universitätsplatz 3, 18055 Rostock, Germany
| | - Michael Karnahl
- Leibniz
Institute for Catalysis at the University of Rostock, Albert Einstein-Straße
29a, 18059 Rostock, Germany
| | - Nils Rockstroh
- Leibniz
Institute for Catalysis at the University of Rostock, Albert Einstein-Straße
29a, 18059 Rostock, Germany
| | - Enrico Barsch
- Institute
of Chemistry, Department Physical Chemistry, University of Rostock, Dr. Lorenz-Weg 1, 18059 Rostock, Germany
- Leibniz
Institute for Catalysis at the University of Rostock, Albert Einstein-Straße
29a, 18059 Rostock, Germany
| | - Patrick Schwarzbach
- Institute
of Physics, University of Rostock, Universitätsplatz 3, 18055 Rostock, Germany
| | - Shu-Ping Luo
- Leibniz
Institute for Catalysis at the University of Rostock, Albert Einstein-Straße
29a, 18059 Rostock, Germany
- State
Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, Zhejiang University of Technology, 310014 Hangzhou, China
| | - Henrik Junge
- Leibniz
Institute for Catalysis at the University of Rostock, Albert Einstein-Straße
29a, 18059 Rostock, Germany
| | - Matthias Beller
- Leibniz
Institute for Catalysis at the University of Rostock, Albert Einstein-Straße
29a, 18059 Rostock, Germany
| | - Stefan Lochbrunner
- Institute
of Physics, University of Rostock, Universitätsplatz 3, 18055 Rostock, Germany
| | - Ralf Ludwig
- Institute
of Chemistry, Department Physical Chemistry, University of Rostock, Dr. Lorenz-Weg 1, 18059 Rostock, Germany
- Leibniz
Institute for Catalysis at the University of Rostock, Albert Einstein-Straße
29a, 18059 Rostock, Germany
| | - Angelika Brückner
- Leibniz
Institute for Catalysis at the University of Rostock, Albert Einstein-Straße
29a, 18059 Rostock, Germany
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132
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Affiliation(s)
- Ek Raj Thapaliya
- Laboratory for Molecular
Photonics, Department of Chemistry, University of Miami, 1301 Memorial
Drive, Coral Gables, Florida 33146-0431, United States
| | - Burjor Captain
- Laboratory for Molecular
Photonics, Department of Chemistry, University of Miami, 1301 Memorial
Drive, Coral Gables, Florida 33146-0431, United States
| | - Françisco M. Raymo
- Laboratory for Molecular
Photonics, Department of Chemistry, University of Miami, 1301 Memorial
Drive, Coral Gables, Florida 33146-0431, United States
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133
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Garg K, King AW, Rack JJ. One photon yields two isomerizations: large atomic displacements during electronic excited-state dynamics in ruthenium sulfoxide complexes. J Am Chem Soc 2014; 136:1856-63. [PMID: 24438000 DOI: 10.1021/ja409262r] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Photochromic compounds efficiently transduce photonic energy to potential energy for excited-state bond-breaking and bond-forming reactions. A critical feature of this reaction is the nature of the electronic excited-state potential energy surface and how this surface facilitates large nuclear displacements and rearrangements. We have prepared two photochromic ruthenium sulfoxide complexes that feature two isomerization reactions following absorption of a single photon. We show by femtosecond transient absorption spectroscopy that this reaction is complete within a few hundred picoseconds and suggest that isomerization occurs along a conical intersection seam formed by the ground-state and excited-state potential energy surfaces.
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Affiliation(s)
- Komal Garg
- Nanoscale and Quantum Phenomena Institute, Department of Chemistry and Biochemistry, Ohio University , Athens, Ohio 45701, United States
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134
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Iwamura M, Takeuchi S, Tahara T. Substituent effect on the photoinduced structural change of Cu(i) complexes observed by femtosecond emission spectroscopy. Phys Chem Chem Phys 2014; 16:4143-54. [DOI: 10.1039/c3cp54322f] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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135
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Chen JL, Cao XF, Wang JY, He LH, Liu ZY, Wen HR, Chen ZN. Synthesis, Characterization, and Photophysical Properties of Heteroleptic Copper(I) Complexes with Functionalized 3-(2′-Pyridyl)-1,2,4-triazole Chelating Ligands. Inorg Chem 2013; 52:9727-40. [DOI: 10.1021/ic4002829] [Citation(s) in RCA: 82] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Jing-Lin Chen
- School of Metallurgy and Chemical
Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, People’s Republic of China
- State Key Laboratory of Structural Chemistry,
Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, People’s
Republic of China
| | - Xing-Fu Cao
- School of Metallurgy and Chemical
Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, People’s Republic of China
| | - Jin-Yun Wang
- State Key Laboratory of Structural Chemistry,
Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, People’s
Republic of China
| | - Li-Hua He
- School of Metallurgy and Chemical
Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, People’s Republic of China
| | - Zong-Yong Liu
- School of Metallurgy and Chemical
Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, People’s Republic of China
| | - He-Rui Wen
- School of Metallurgy and Chemical
Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, People’s Republic of China
| | - Zhong-Ning Chen
- State Key Laboratory of Structural Chemistry,
Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, People’s
Republic of China
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136
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Nishikawa M, Takara Y, Hattori Y, Nomoto K, Kusamoto T, Kume S, Nishihara H. Structural modification on copper(I)-pyridylpyrimidine complexes for modulation of rotational dynamics, redox properties, and phototriggered isomerization. Inorg Chem 2013; 52:8962-70. [PMID: 23883176 DOI: 10.1021/ic4011295] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The redox properties of copper pyridylpyrimidine complexes, which undergo linkage isomerism based on pyrimidine ring rotation, were compared under different coordination environments. A newly synthesized compound, [Cu(Mepypm)(L(Mes))]BF4 (1·BF4, Mepypm = 4-methyl-2-(2'-pyridyl)pyrimidine, L(Mes) = 2,9-dimesityl-1,10-phenanthroline) was compared with previously reported complexes of [Cu(MepmMepy)(L(Mes))]BF4 (2·BF4, MepmMepy = 4-methyl-2-(6'-methyl-2'-pyridyl)pyrimidine), Cu(Mepypm)(DPEphos)]BF4 (3·BF4, DPEphos = bis[2-(diphenylphosphino)phenyl]ether), [Cu(Mepypm)(L(Anth))]BF4 (4·BF4, L(Anth) = 2,9-bis(9-anthryl)-1,10-phenanthroline), and [Cu(Mepypm)(L(Macro))]BF4 (5·BF4). Isomer ratios, isomerization dynamics, redox properties, and photoelectron conversion functions varied with the coordination structure. Methyl substituents on the 6-position of the pyridine moiety increased steric repulsion and contributed to quicker rotation, enhanced photoluminescence, and increased photodriven rotational isomerization.
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Affiliation(s)
- Michihiro Nishikawa
- Department of Chemistry, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
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137
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Vallett PJ, Damrauer NH. Experimental and Computational Exploration of Ground and Excited State Properties of Highly Strained Ruthenium Terpyridine Complexes. J Phys Chem A 2013; 117:6489-507. [DOI: 10.1021/jp404248z] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Paul J. Vallett
- Department
of Chemistry and Biochemistry, University of Colorado Boulder, Boulder, Colorado 80309,
United States
| | - Niels H. Damrauer
- Department
of Chemistry and Biochemistry, University of Colorado Boulder, Boulder, Colorado 80309,
United States
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138
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Lemus L, Ferraudi G, Lappin AG. A single- and double-flash flash photolysis study of the sequential biphotonic photoprocesses of Cu(I) phenanthrolines. Comparison of the helicate complex, [Cu2(1,3-bis(9-methyl-1,10-phenanthrolin-2-yl)propane)2]2+, and [Cu(2,9-dimethyl-1,10-phenanthroline)2]+ photoprocesses. Dalton Trans 2013; 42:8637-43. [PMID: 23632386 DOI: 10.1039/c3dt50258a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Photochemical processes induced when two photons are sequentially absorbed by the helicate complex [Cu2(mphenpr)2](2+), where mphenpr = 1,3-bis(9-methyl-1,10-phenanthrolin-2-yl)propane, and [Cu(dmp)2](+) were investigated in CH2Cl2 containing solvents. A strong resemblance was observed between the fs-ns photophysics of [Cu2(mphenpr)2](2+) and Cu(I) phenanthroline complexes having a large steric hindrance. In the biphotonic regime, single-flash flash-photolyzed solutions were used for the determination of the product concentrations and quantum yields. The concentration of Cl(-) produced by the photoinduced decomposition of CH2Cl2 increases linearly with flash intensity as expected for a monophotonic process. In contrast, the concentration of a decomposed Cu(I) complex exhibits the quadratic dependence on flash intensity of a biphotonic process. Results of a sequential double-flash flash photolysis experiment are consistent with the decomposition of CH2Cl2 ahead of the flattened excited state formation and with the absorption of the second photon by the flattened MLCT excited state.
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Affiliation(s)
- L Lemus
- Facultad de Química y Biología, Universidad de Santiago de Chile, Av. Libertador Bernardo O'Higgins 3363, Estación Central, Santiago, Chile
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139
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McCusker CE, Castellano FN. Design of a Long-Lifetime, Earth-Abundant, Aqueous Compatible Cu(I) Photosensitizer Using Cooperative Steric Effects. Inorg Chem 2013; 52:8114-20. [DOI: 10.1021/ic401213p] [Citation(s) in RCA: 135] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Catherine E. McCusker
- Department of Chemistry & Center for Photochemical Sciences, Bowling Green State University, Bowling Green, Ohio 43403, United States
| | - Felix N. Castellano
- Department of Chemistry & Center for Photochemical Sciences, Bowling Green State University, Bowling Green, Ohio 43403, United States
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140
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Sandroni M, Kayanuma M, Planchat A, Szuwarski N, Blart E, Pellegrin Y, Daniel C, Boujtita M, Odobel F. First application of the HETPHEN concept to new heteroleptic bis(diimine) copper(I) complexes as sensitizers in dye sensitized solar cells. Dalton Trans 2013; 42:10818-27. [PMID: 23783812 DOI: 10.1039/c3dt50852h] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
We report here the synthesis and full chemical and physical characterizations of the first stable heteroleptic copper(I)-bis(diimine) complexes designed for implementation in dye sensitized solar cells (DSC). Thanks to the HETPHEN concept, pure and stable heteroleptic copper(I) complexes were isolated. Anchorage of the sensitizers was provided by 2,2'-biquinoline-4,4'-dicarboxylic acid (dcbqH2), while sterically challenged ligands 2,9-dimesityl-1,10-phenanthroline (L0) and N-hexyl-2,9-dimesityl-1,10-phenanthroline-[a:b]imidazo-(4'-dianisylaminophenyl) (L1) were used to complete the copper(I) coordination sphere. The resulting heteroleptic complexes C1 and C2 exhibit a broad MLCT transition spreading over a wide wavelength domain, especially when adsorbed onto nanoparticulate TiO2 photoanodes, providing a rather comprehensive visible light collection. The corresponding DSC were evaluated under AM 1.5 simulated solar light and rather weak performances were obtained owing to small J(sc) and V(oc). This is due to a combination of low extinction coefficient and poor driving forces for the various interfacial processes. However, significant improvements in the performances were monitored upon ageing in the dark, likely due to beneficial reorganization of the dye monolayers. The possibility to isolate stable asymmetric systems paves the way for structurally assisted photo-induced charge injection from the chemisorbed copper(i) based sensitizers into the conduction band of TiO2, through charge vectorialization.
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Affiliation(s)
- Martina Sandroni
- Laboratoire Chimie et Interdisciplinarité: Synthèse, Analyse et Modélisation UMR 6230 CNRS-Université de Nantes, 2 rue de la Houssinière, 44322 Nantes Cedex, France
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141
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Tromp M, Dent AJ, Headspith J, Easun TL, Sun XZ, George MW, Mathon O, Smolentsev G, Hamilton ML, Evans J. Energy dispersive XAFS: characterization of electronically excited states of copper(I) complexes. J Phys Chem B 2013; 117:7381-7. [PMID: 23718738 PMCID: PMC3748449 DOI: 10.1021/jp4020355] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
![]()
Energy
dispersive X-ray absorption spectroscopy (ED-XAS), in which
the whole XAS spectrum is acquired simultaneously, has been applied
to reduce the real-time for acquisition of spectra of photoinduced
excited states by using a germanium microstrip detector gated around
one X-ray bunch of the ESRF (100 ps). Cu K-edge XAS was used to investigate
the MLCT states of [Cu(dmp)2]+ (dmp =2,9-dimethyl-1,10-phenanthroline)
and [Cu(dbtmp)2]+ (dbtmp =2,9-di-n-butyl-3,4,7,8-tetramethyl-1,10-phenanthroline) with the excited
states created by excitation at 450 nm (10 Hz). The decay of the longer
lived complex with bulky ligands, was monitored for up to 100 ns.
DFT calculations of the longer lived MLCT excited state of [Cu(dbp)2]+ (dbp =2,9-di-n-butyl-1,10-phenanthroline)
with the bulkier diimine ligands, indicated that the excited state
behaves as a Jahn–Teller distorted Cu(II) site, with the interligand
dihedral angle changing from 83 to 60° as the tetrahedral coordination
geometry flattens and a reduction in the Cu–N distance of 0.03
Å.
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Affiliation(s)
- Moniek Tromp
- School of Chemistry, University of Southampton, Southampton, SO17 1BE, UK
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142
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Penfold TJ, Karlsson S, Capano G, Lima FA, Rittmann J, Reinhard M, Rittmann-Frank MH, Braem O, Baranoff E, Abela R, Tavernelli I, Rothlisberger U, Milne CJ, Chergui M. Solvent-induced luminescence quenching: static and time-resolved X-ray absorption spectroscopy of a copper(I) phenanthroline complex. J Phys Chem A 2013; 117:4591-601. [PMID: 23617226 DOI: 10.1021/jp403751m] [Citation(s) in RCA: 86] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We present a static and picosecond X-ray absorption study at the Cu K-edge of bis(2,9-dimethyl-1,10-phenanthroline)copper(I) ([Cu(dmp)2](+); dmp = 2,9-dimethyl-1,10-phenanthroline) dissolved in acetonitrile and dichloromethane. The steady-state photoluminescence spectra in dichloromethane and acetonitrile are also presented and show a shift to longer wavelengths for the latter, which points to a stronger stabilization of the excited complex. The fine structure features of the static and transient X-ray spectra allow an unambiguous assignment of the electronic and geometric structure of the molecule in both its ground and excited (3)MLCT states. Importantly, the transient spectra are remarkably similar for both solvents, and the spectral changes can be rationalized using the optimized ground- and excited-state structures of the complex. The proposed assignment of the lifetime shortening of the excited state in donor solvents (acetonitrile) to a metal-centered exciplex is not corroborated here. Molecular dynamics simulations confirm the lack of complexation; however, in both solvents the molecules come close to the metal but undergo rapid exchange with the bulk. The shortening of the lifetime of the title complex and nine additional related complexes can be rationalized by the decrease in the (3)MLCT energy. Deviations from this trend may be explained by means of the effects of the dihedral angle between the ligand planes, the solvent, and the (3)MLCT-(1)MLCT energy gap.
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Affiliation(s)
- T J Penfold
- Laboratoire De Spectroscopie Ultrarapide, École Polytechnique Fédérale De Lausanne, ISIC, FSB-BSP, CH-1015 Lausanne, Switzerland
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143
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Fraser MG, van der Salm H, Cameron SA, Blackman AG, Gordon KC. Heteroleptic Cu(I) bis-diimine complexes of 6,6'-dimesityl-2,2'-bipyridine: a structural, theoretical and spectroscopic study. Inorg Chem 2013; 52:2980-92. [PMID: 23458499 DOI: 10.1021/ic302393p] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
A series of heteroleptic Cu(I) complexes containing 6,6'-dimesityl-2,2'-bipyridine and phenanthroline-, bipyridine-, and biquinoline-based ligands is studied. The HETPHEN strategy is utilized to synthesize the heteroleptic complexes, which are stable in solution. The X-ray crystal structures of the complexes are presented; the solid-state four-coordinate Cu(I) geometries are quantified by using the τ4 parameter. A feature of the crystal structures is the intramolecular π-stacking between the mesityl ring(s) and the diimine ligand; the phen-based complexes exhibit stacking between the phen ligand and one of the mesityl rings, creating a "Pac-Man" motif. On the other hand, the bpy-based complexes show different types of packing interaction, with both mesityl rings "clamping down" on the bpy based ligand to give π-stacking. Cyclic voltammetry is used to examine the redox chemistry of the complexes. The most positive potentials for the oxidation process are observed for the complexes with bulky substituents ortho to the coordination nitrogens atoms, i.e., 2,9-dimethyl-1,10-phenanthroline and 6,6'-dibromo-2,2'-bipyridine. The Cu(I) MLCT transitions of the complexes are investigated by resonance Raman spectroscopy in concert with TD-DFT calculations. The resonance Raman spectra of complexes containing substituted biquinolines are straightforward, in that vibrational bands of the biquinoline-based ligand are selectively enhanced over bpy(Mes)2 bands. This is consistent with the purple color of the complexes, due to the lower energy of the biquinoline-based LUMO compared to the bpy(Mes)2 LUMO. All the phen- and bpy-based complexes show enhancement of bpy(Mes)2 bands.
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Affiliation(s)
- Michael G Fraser
- MacDiarmid Institute for Advanced Materials and Nanotechnology, Department of Chemistry, University of Otago, Dunedin, New Zealand
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144
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Mara MW, Jackson NE, Huang J, Stickrath AB, Zhang X, Gothard NA, Ratner MA, Chen LX. Effects of electronic and nuclear interactions on the excited-state properties and structural dynamics of copper(I) diimine complexes. J Phys Chem B 2013; 117:1921-31. [PMID: 23323679 DOI: 10.1021/jp311643t] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The effects of structural constraints on the metal-to-ligand charge transfer (MLCT) excited state structural dynamics of cuprous bis-2,9-diphenyl-phenanthroline ([Cu(I)(dpp)(2)](+)) in both coordinating acetonitrile and noncoordinating toluene were studied using X-ray transient absorption (XTA) spectroscopy and density functional theory (DFT) calculations. The phenyl groups attached to the phenanthroline ligands not only effectively shield the Cu(I) center from solvent molecules, but also force a flattened tetrahedral coordination geometry of the Cu(I) center. Consequently, the MLCT state lifetime in [Cu(I)(dpp)(2)](+) is solvent-independent, unlike the previously studied 2,9-methyl substituted bis-phenanthroline Cu(I) complex. The MLCT state of [Cu(I)(dpp)(2)](+) still undergoes a "pseudo Jahn-Teller distortion," with the angle between the two phenanthroline ligand planes decreased further by 7°. The XTA results indicate that, in the MLCT excited state of [Cu(I)(dpp)(2)](+), the phenyls at the 2, 9 positions of the phenanthroline rotate, breaking the π-π interaction with the phenanthroline ligands without ever rotating in-plane with the phenanthroline ligands. Hence, the transferred electron density from the Cu(I) center is localized on the phenanthroline moiety with no charge density present on the phenyl rings. The insight about the effect of the structural constraints on the MLCT state properties will guide the design of Cu(I) diimine complexes with suitable excited-state properties to function as earth-abundant dye sensitizers for solar electricity generation.
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Affiliation(s)
- Michael W Mara
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, USA
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145
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Iwamura M, Nozaki K, Takeuchi S, Tahara T. Real-Time Observation of Tight Au–Au Bond Formation and Relevant Coherent Motion upon Photoexcitation of [Au(CN)2–] Oligomers. J Am Chem Soc 2013; 135:538-41. [DOI: 10.1021/ja310004z] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Munetaka Iwamura
- Graduate School of Science and
Engineering, University of Toyama, 3190
Gofuku, Toyama 930-8555, Japan
| | - Koichi Nozaki
- Graduate School of Science and
Engineering, University of Toyama, 3190
Gofuku, Toyama 930-8555, Japan
| | - Satoshi Takeuchi
- Molecular Spectroscopy Laboratory, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Tahei Tahara
- Molecular Spectroscopy Laboratory, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
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146
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Nishikawa M, Kume S, Nishihara H. Stimuli-responsive pyrimidine ring rotation in copper complexes for switching their physical properties. Phys Chem Chem Phys 2013; 15:10549-65. [DOI: 10.1039/c3cp44710c] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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147
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Papanikolaou PA, Tkachenko NV. Probing the excited state dynamics of a new family of Cu(i)-complexes with an enhanced light absorption capacity: excitation-wavelength dependent population of states through branching. Phys Chem Chem Phys 2013; 15:13128-36. [DOI: 10.1039/c3cp50838b] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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148
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Czerwieniec R, Kowalski K, Yersin H. Highly efficient thermally activated fluorescence of a new rigid Cu(i) complex [Cu(dmp)(phanephos)]+. Dalton Trans 2013; 42:9826-30. [DOI: 10.1039/c3dt51006a] [Citation(s) in RCA: 147] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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149
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Kraack JP, Wand A, Buckup T, Motzkus M, Ruhman S. Mapping multidimensional excited state dynamics using pump-impulsive-vibrational-spectroscopy and pump-degenerate-four-wave-mixing. Phys Chem Chem Phys 2013; 15:14487-501. [DOI: 10.1039/c3cp50871d] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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150
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Nishikawa M, Nomoto K, Kume S, Nishihara H. Solvated-Ion-Pairing-Sensitive Molecular Bistability Based on Copper(I)-Coordinated Pyrimidine Ring Rotation. Inorg Chem 2012; 52:369-80. [DOI: 10.1021/ic302141z] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Michihiro Nishikawa
- Department of Chemistry, School
of Science, The University of Tokyo, 7-3-1
Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Kuniharu Nomoto
- Department of Chemistry, School
of Science, The University of Tokyo, 7-3-1
Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Shoko Kume
- Department of Chemistry, School
of Science, The University of Tokyo, 7-3-1
Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Hiroshi Nishihara
- Department of Chemistry, School
of Science, The University of Tokyo, 7-3-1
Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
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