1
|
Mapley JI, Wagner P, Officer DL, Gordon KC. Computational and Spectroscopic Analysis of β-Indandione Modified Zinc Porphyrins. J Phys Chem A 2018; 122:4448-4456. [PMID: 29672040 DOI: 10.1021/acs.jpca.8b02746] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Porphyrins have characteristic optical properties which give them the potential to be used in a range of applications. In this study, a series of β-indandione modified zinc porphyrins, systematically changed in terms of linker length and substituent, resulted in absorption spectra that are dramatically different than that observed for the parent zinc porphyrin (ZnTXP, 5,10,15,20-tetrakis(3,5-dimethylphenyl)porphyrinato zinc(II)). These changes include strong absorptions at 420, 541, and 681 nm (110.2, 57.5, and 29.2 mM-1 cm-1, respectively) for the most perturbed compound. Computational studies were conducted and showed the different optical effects are due to a reorganization of molecular orbitals (MOs) away from Gouterman's four-orbital model. The substituent effects alter both unoccupied and occupied MOs. An increased length of linker group raised the energy of the HOMO-2 such that it plays a significant role in the observed transitions. The degenerate LUMO (eg) set are split by substitution, and this splitting may be increased by use of a propylidenodinitrile group, which shows the lowest-energy transitions and the greatest spectral perturbation from the parent zinc porphyrin complex. These data are supported by resonance Raman spectroscopy studies which show distinct enhancement of phenyl modes for high-energy transitions and indandione modes for lower-energy transitions.
Collapse
Affiliation(s)
- Joseph I Mapley
- Department of Chemistry , University of Otago , PO Box 56, Dunedin , New Zealand
| | - Pawel Wagner
- Intelligent Polymer Research Institute and ARC Centre of Excellence for Electromaterials Science , University of Wollongong , Wollongong , NSW 2522 , Australia
| | - David L Officer
- Intelligent Polymer Research Institute and ARC Centre of Excellence for Electromaterials Science , University of Wollongong , Wollongong , NSW 2522 , Australia
| | - Keith C Gordon
- Department of Chemistry , University of Otago , PO Box 56, Dunedin , New Zealand
| |
Collapse
|
2
|
Mondal S, Puranik M. Sub-50 fs excited state dynamics of 6-chloroguanine upon deep ultraviolet excitation. Phys Chem Chem Phys 2017; 18:13874-87. [PMID: 27146198 DOI: 10.1039/c6cp01746k] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
The photophysical properties of natural nucleobases and their respective nucleotides are ascribed to the sub-picosecond lifetime of their first singlet states in the UV-B region (260-350 nm). Electronic transitions of the ππ* type, which are stronger than those in the UV-B region, lie at the red edge of the UV-C range (100-260 nm) in all isolated nucleobases. The lowest energetic excited states in the UV-B region of nucleobases have been investigated using a plethora of experimental and theoretical methods in gas and solution phases. The sub-picosecond lifetime of these molecules is not a general attribute of all nucleobases but specific to the five primary nucleobases and a few xanthine and methylated derivatives. To determine the overall UV photostability, we aim to understand the effect of more energetic photons lying in the UV-C region on nucleobases. To determine the UV-C initiated photophysics of a nucleobase system, we chose a halogen substituted purine, 6-chloroguanine (6-ClG), that we had investigated previously using resonance Raman spectroscopy. We have performed quantitative measurements of the resonance Raman cross-section across the Bb absorption band (210-230 nm) and constructed the Raman excitation profiles. We modeled the excitation profiles using Lee and Heller's time-dependent theory of resonance Raman intensities to extract the initial excited state dynamics of 6-ClG within 30-50 fs after photoexcitation. We found that imidazole and pyrimidine rings of 6-ClG undergo expansion and contraction, respectively, following photoexcitation to the Bb state. The amount of distortions of the excited state structure from that of the ground state structure is reflected by the total internal reorganization energy that is determined at 112 cm(-1). The contribution of the inertial component of the solvent response towards the total reorganization energy was obtained at 1220 cm(-1). In addition, our simulation also yields an instantaneous response of the first solvation shell within an ultrafast timescale of less than 30 fs following photoexcitation.
Collapse
Affiliation(s)
- Sayan Mondal
- Indian Institute of Science Education and Research, Dr. Homi Bhabha Road, Pashan, Pune 411008, India.
| | - Mrinalini Puranik
- Indian Institute of Science Education and Research, Dr. Homi Bhabha Road, Pashan, Pune 411008, India.
| |
Collapse
|
3
|
Mondal S, Puranik M. Ultrafast structural dynamics of photoexcited adenine. Phys Chem Chem Phys 2017; 19:20224-20240. [DOI: 10.1039/c7cp03092d] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Ultraviolet Resonance Raman (UVRR) spectroscopy derives distinct electronic properties of adenine in the La (260 nm) and Bb (210 nm) excited states.
Collapse
Affiliation(s)
- Sayan Mondal
- Indian Institute of Science Education and Research
- Pune – 411008
- India
| | - Mrinalini Puranik
- Indian Institute of Science Education and Research
- Pune – 411008
- India
| |
Collapse
|
4
|
Shillito GE, Larsen CB, McLay JRW, Lucas NT, Gordon KC. Effect of Bridge Alteration on Ground- and Excited-State Properties of Ruthenium(II) Complexes with Electron-Donor-Substituted Dipyrido[3,2-a:2',3'-c]phenazine Ligands. Inorg Chem 2016; 55:11170-11184. [PMID: 27723325 DOI: 10.1021/acs.inorgchem.6b01810] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A series of Ru(II) 2,2'-bipyridine (bpy) complexes with an electron-accepting dipyrido[3,2-a:2',3'-c]phenazine (dppz) ligand coupled to an electron-donating triarylamine (TAA) group have been investigated. Systematic alteration of a bridging unit between the dppz and TAA allowed exploration into how communication between the donor and acceptor is perturbed by distance, as well as by steric and electronic effects. The effect of the bridging group on the electronic properties of the systems was characterized using a variety of spectroscopic methods, including Fourier transform-Raman (FT-Raman) spectroscopy, resonance Raman spectroscopy, and transient resonance Raman (TR2) spectroscopy. These methods were used in conjunction with ground- and excited-state absorption spectroscopy, electrochemical studies, and DFT calculations. The ground-state electronic absorption spectra show distinct variation with the bridging group, with the wavelength observed for the lowest energy electronic transition ranging from 449 nm to 522 nm, accompanied by large changes in the molar absorptivity. The lowest-energy Franck-Condon state was determined to be intra-ligand charge transfer (ILCT) in nature for most compounds. The presence of higher-energy metal-to-ligand charge transfer (MLCT) Ru(II) → bpy and Ru(II) → dppz transitions was also confirmed via resonance Raman spectroscopy. The TR2 spectra showed characteristic dppz• - and TAA• + vibrations, indicating that the THEXI state formed was also ILCT in nature. Excited-state lifetime measurements reveal that the rate of decay is in accordance with the energy gap law and is not otherwise affected by the nature of the bridging unit.
Collapse
Affiliation(s)
- Georgina E Shillito
- Department of Chemistry, University of Otago , P.O. Box 56, Dunedin, New Zealand
| | - Christopher B Larsen
- Department of Chemistry, University of Otago , P.O. Box 56, Dunedin, New Zealand
| | - James R W McLay
- Department of Chemistry, University of Otago , P.O. Box 56, Dunedin, New Zealand
| | - Nigel T Lucas
- Department of Chemistry, University of Otago , P.O. Box 56, Dunedin, New Zealand
| | - Keith C Gordon
- Department of Chemistry, University of Otago , P.O. Box 56, Dunedin, New Zealand
| |
Collapse
|
5
|
Elliott ABS, Lewis JEM, van der Salm H, McAdam CJ, Crowley JD, Gordon KC. Luminescent Cages: Pendant Emissive Units on [Pd2L4]4+ “Click” Cages. Inorg Chem 2016; 55:3440-7. [DOI: 10.1021/acs.inorgchem.5b02843] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
| | - James E. M. Lewis
- Department of Chemistry, University of Otago,
P.O. Box 56, Dunedin, New Zealand
| | - Holly van der Salm
- Department of Chemistry, University of Otago,
P.O. Box 56, Dunedin, New Zealand
| | - C. John McAdam
- Department of Chemistry, University of Otago,
P.O. Box 56, Dunedin, New Zealand
| | - James D. Crowley
- Department of Chemistry, University of Otago,
P.O. Box 56, Dunedin, New Zealand
| | - Keith C. Gordon
- Department of Chemistry, University of Otago,
P.O. Box 56, Dunedin, New Zealand
| |
Collapse
|
6
|
Rasheed L, Yousuf M, Youn IS, Shi G, Kim KS. An efficient non-reaction based colorimetric and fluorescent probe for the highly selective discrimination of Pd0 and Pd2+ in aqueous media. RSC Adv 2016. [DOI: 10.1039/c6ra09183k] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A novel anthraquinone-imidazole based colorimetric and fluorogenic probe 1 discriminates the oxidation states of Pd0 and Pd2+ by naked eye with high selectivity in aqueous media due to the difference in coordination in the pocket of probe molecule.
Collapse
Affiliation(s)
- Lubna Rasheed
- Center for Superfunctional Materials
- Department of Chemistry
- Ulsan National Institute of Science and Technology (UNIST)
- Ulsan 44919
- South Korea
| | - Muhammad Yousuf
- Center for Superfunctional Materials
- Department of Chemistry
- Ulsan National Institute of Science and Technology (UNIST)
- Ulsan 44919
- South Korea
| | - Il Seung Youn
- Center for Superfunctional Materials
- Department of Chemistry
- Ulsan National Institute of Science and Technology (UNIST)
- Ulsan 44919
- South Korea
| | - Genggongwo Shi
- Center for Superfunctional Materials
- Department of Chemistry
- Ulsan National Institute of Science and Technology (UNIST)
- Ulsan 44919
- South Korea
| | - Kwang S. Kim
- Center for Superfunctional Materials
- Department of Chemistry
- Ulsan National Institute of Science and Technology (UNIST)
- Ulsan 44919
- South Korea
| |
Collapse
|
7
|
Milán-Garcés EA, Kaptan S, Puranik M. Mode-specific reorganization energies and ultrafast solvation dynamics of Tryptophan from Raman line-shape analysis. Biophys J 2014; 105:211-21. [PMID: 23823241 DOI: 10.1016/j.bpj.2013.04.044] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2012] [Revised: 04/19/2013] [Accepted: 04/22/2013] [Indexed: 10/26/2022] Open
Abstract
Tryptophan is widely used as an intrinsic fluorophore for studies of protein structure and dynamics. Its fluorescence is known to have two decay components with lifetimes of 0.5 and 3.1 ns. In this work we measure the ultrafast dynamics of Tryptophan at <100 fs through measurements and modeling of the Raman excitation profiles with time-dependent wave packet propagation theory. We use a Brownian oscillator model to simulate the water-tryptophan interaction. Upon photoexcitation to the higher singlet electronic state (Bb) the structure of tryptophan is distorted to an overall expansion of the pyrrole and benzene rings. The total reorganization energy for Trp in water is estimated to be 2169 cm(-1) with a 1230 cm(-1) contribution from the inertial response of water. The value of reorganization energy of water corresponding to the fast response is found to be higher than that obtained upon excitation to the La state by previous studies that used computational simulations. The long-time dynamics of Trp manifests as a conformational heterogeneity at shorter times and contributes to inhomogeneous broadening of the Raman profiles (315 cm(-1)).
Collapse
Affiliation(s)
- Erix A Milán-Garcés
- National Centre for Biological Sciences, Tata Institute of Fundamental Research, Bangalore, India
| | | | | |
Collapse
|
8
|
McLean TM, Telfer SG, Elliott ABS, Gordon KC, Lein M, Waterland MR. Molecular excitons in a copper azadipyrrin complex. Dalton Trans 2014; 43:17746-53. [DOI: 10.1039/c4dt01588f] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Exciton coupling is applied for the first time to successfully explain the excited-state structure of metalloazadipyrrins.
Collapse
Affiliation(s)
- T. M. McLean
- Institute of Fundamental Sciences
- Massey University
- Palmerston North, New Zealand
| | - S. G. Telfer
- Institute of Fundamental Sciences
- Massey University
- Palmerston North, New Zealand
| | | | - K. C. Gordon
- Department of Chemistry
- University of Otago
- Dunedin, New Zealand
| | - M. Lein
- School of Chemical and Physical Sciences
- Victoria University of Wellington
- Wellington, New Zealand
| | - M. R. Waterland
- Institute of Fundamental Sciences
- Massey University
- Palmerston North, New Zealand
| |
Collapse
|
9
|
Rhenium(I) complexes of readily functionalized bidentate pyridyl-1,2,3-triazole “click” ligands: A systematic synthetic, spectroscopic and computational study. Polyhedron 2013. [DOI: 10.1016/j.poly.2012.05.003] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
10
|
Probing the electronic structure of -fused quinoxalino porphyrins and tetraazaanthracene-bridged bis-porphyrins with resonance Raman spectroscopy and density functional theory. J Mol Struct 2012. [DOI: 10.1016/j.molstruc.2012.06.017] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
11
|
Wächtler M, Guthmuller J, González L, Dietzek B. Analysis and characterization of coordination compounds by resonance Raman spectroscopy. Coord Chem Rev 2012. [DOI: 10.1016/j.ccr.2012.02.004] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
|
12
|
Fraser MG, Clark CA, Horvath R, Lind SJ, Blackman AG, Sun XZ, George MW, Gordon KC. Complete Family of Mono-, Bi-, and Trinuclear ReI(CO)3Cl Complexes of the Bridging Polypyridyl Ligand 2,3,8,9,14,15-Hexamethyl-5,6,11,12,17,18-hexaazatrinapthalene: Syn/Anti Isomer Separation, Characterization, and Photophysics. Inorg Chem 2011; 50:6093-106. [DOI: 10.1021/ic200136t] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Michael G. Fraser
- MacDiarmid Institute for Advanced Materials and Nanotechnology, Department of Chemistry, University of Otago, Dunedin, New Zealand
| | - Charlotte A. Clark
- School of Chemistry, University of Nottingham, Nottingham NG7 2RD, United Kingdom
| | - Raphael Horvath
- MacDiarmid Institute for Advanced Materials and Nanotechnology, Department of Chemistry, University of Otago, Dunedin, New Zealand
| | - Samuel J. Lind
- MacDiarmid Institute for Advanced Materials and Nanotechnology, Department of Chemistry, University of Otago, Dunedin, New Zealand
| | - Allan G. Blackman
- MacDiarmid Institute for Advanced Materials and Nanotechnology, Department of Chemistry, University of Otago, Dunedin, New Zealand
| | - Xue-Zhong Sun
- School of Chemistry, University of Nottingham, Nottingham NG7 2RD, United Kingdom
| | - Michael W. George
- School of Chemistry, University of Nottingham, Nottingham NG7 2RD, United Kingdom
| | - Keith C. Gordon
- MacDiarmid Institute for Advanced Materials and Nanotechnology, Department of Chemistry, University of Otago, Dunedin, New Zealand
| |
Collapse
|
13
|
Anfuso CL, Snoeberger RC, Ricks AM, Liu W, Xiao D, Batista VS, Lian T. Covalent Attachment of a Rhenium Bipyridyl CO2 Reduction Catalyst to Rutile TiO2. J Am Chem Soc 2011; 133:6922-5. [DOI: 10.1021/ja2013664] [Citation(s) in RCA: 95] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Chantelle L. Anfuso
- Department of Chemistry, Emory University, Atlanta, Georgia 30322, United States
| | - Robert C. Snoeberger
- Department of Chemistry, Yale University, New Haven, Connecticut 06520-8107, United States
| | - Allen M. Ricks
- Department of Chemistry, Emory University, Atlanta, Georgia 30322, United States
| | - Weimin Liu
- Department of Chemistry, Emory University, Atlanta, Georgia 30322, United States
| | - Dequan Xiao
- Department of Chemistry, Yale University, New Haven, Connecticut 06520-8107, United States
| | - Victor S. Batista
- Department of Chemistry, Yale University, New Haven, Connecticut 06520-8107, United States
| | - Tianquan Lian
- Department of Chemistry, Emory University, Atlanta, Georgia 30322, United States
| |
Collapse
|
14
|
Horvath R, Gordon KC. Understanding excited-state structure in metal polypyridyl complexes using resonance Raman excitation profiles, time-resolved resonance Raman spectroscopy and density functional theory. Coord Chem Rev 2010. [DOI: 10.1016/j.ccr.2009.11.015] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
|
15
|
McLean T, Cleland D, Lind S, Gordon K, Telfer S, Waterland M. Strongly Absorbing π-π* States in Heteroleptic Dipyrrin/2,2′-Bipyridine Ruthenium Complexes: Excited-State Dynamics from Resonance Raman Spectroscopy. Chem Asian J 2010; 5:2036-46. [DOI: 10.1002/asia.201000033] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
|
16
|
Philippopoulos AI, Tsantila N, Demopoulos CA, Raptopoulou CP, Likodimos V, Falaras P. Synthesis, characterization and crystal structure of the cis-[RhL2Cl2]Cl complex with the bifunctional ligand (L) 2-(2′-pyridyl)quinoxaline. Biological activity towards PAF (Platelet Activating Factor) induced platelet aggregation. Polyhedron 2009. [DOI: 10.1016/j.poly.2009.05.014] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
17
|
Lind SJ, Walsh TJ, Blackman AG, Polson MIJ, Irwin GIS, Gordon KC. Trinuclear Copper(I) Complex Containing 3,4,9,10,15,16-Hexamethyl-1,6,7,12,13,18-hexaazatrinaphthylene: A Structural, Spectroscopic, and Computational Study. J Phys Chem A 2009; 113:3566-75. [DOI: 10.1021/jp808179m] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Samuel J. Lind
- MacDiarmid Institute for Advanced Materials and Nanotechnology, Department of Chemistry, University of Otago, Dunedin, New Zealand
| | - Timothy J. Walsh
- MacDiarmid Institute for Advanced Materials and Nanotechnology, Department of Chemistry, University of Otago, Dunedin, New Zealand
| | - Allan G. Blackman
- MacDiarmid Institute for Advanced Materials and Nanotechnology, Department of Chemistry, University of Otago, Dunedin, New Zealand
| | - Matthew I. J. Polson
- MacDiarmid Institute for Advanced Materials and Nanotechnology, Department of Chemistry, University of Otago, Dunedin, New Zealand
| | - Garth I. S. Irwin
- MacDiarmid Institute for Advanced Materials and Nanotechnology, Department of Chemistry, University of Otago, Dunedin, New Zealand
| | - Keith C. Gordon
- MacDiarmid Institute for Advanced Materials and Nanotechnology, Department of Chemistry, University of Otago, Dunedin, New Zealand
| |
Collapse
|
18
|
Lind SJ, Gordon KC, Gambhir S, Officer DL. A spectroscopic and DFT study of thiophene-substituted metalloporphyrins as dye-sensitized solar cell dyes. Phys Chem Chem Phys 2009; 11:5598-607. [DOI: 10.1039/b900988d] [Citation(s) in RCA: 67] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
|
19
|
|