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Sar D, Ostadhossein F, Moitra P, Alafeef M, Pan D. Small Molecule NIR-II Dyes for Switchable Photoluminescence via Host -Guest Complexation and Supramolecular Assembly with Carbon Dots. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2022; 9:e2202414. [PMID: 35657032 PMCID: PMC9353451 DOI: 10.1002/advs.202202414] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2022] [Indexed: 05/19/2023]
Abstract
Small molecular NIR-II dyes are highly desirable for various biomedical applications. However, NIR-II probes are still limited due to the complex synthetic processes and inadequate availability of fluorescent core. Herein, the design and synthesis of three small molecular NIR-II dyes are reported. These dyes can be excited at 850-915 nm and emitted at 1280-1290 nm with a large stokes shift (≈375 nm). Experimental and computational results indicate a 2:1 preferable host-guest assembly between the cucurbit[8]uril (CB) and dye molecules. Interestingly, the dyes when self-assembled in presence of CB leads to the formation of nanocubes (≈200 nm) and exhibits marked enhancement in fluorescence emission intensity (Switch-On). However, the addition of red carbon dots (rCDots, ≈10 nm) quenches the fluorescence of these host-guest complexes (Switch-Off) providing flexibility in the user-defined tuning of photoluminescence. The turn-ON complex found to have comparable quantum yield to the commercially available near-infrared fluorophore, IR-26. The aqueous dispersibility, cellular and blood compatibility, and NIR-II bioimaging capability of the inclusion complexes is also explored. Thus, a switchable fluorescence behavior, driven by host-guest complexation and supramolecular self-assembly, is demonstrated here for three new NIR-II dyes.
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Affiliation(s)
- Dinabandhu Sar
- Bioengineering DepartmentUniversity of Illinois at Urbana‐ChampaignUrbanaIL61801USA
| | - Fatemeh Ostadhossein
- Bioengineering DepartmentUniversity of Illinois at Urbana‐ChampaignUrbanaIL61801USA
| | - Parikshit Moitra
- Department of PediatricsCenter for Blood Oxygen Transport and HemostasisUniversity of Maryland Baltimore School of MedicineHealth Sciences Research Facility III670 W Baltimore St.BaltimoreMD21201USA
| | - Maha Alafeef
- Bioengineering DepartmentUniversity of Illinois at Urbana‐ChampaignUrbanaIL61801USA
- Department of PediatricsCenter for Blood Oxygen Transport and HemostasisUniversity of Maryland Baltimore School of MedicineHealth Sciences Research Facility III670 W Baltimore St.BaltimoreMD21201USA
- Department of ChemicalBiochemical and Environmental EngineeringUniversity of Maryland Baltimore CountyInterdisciplinary Health Sciences Facility1000 Hilltop CircleBaltimoreMD21250USA
- Biomedical Engineering DepartmentJordan University of Science and TechnologyIrbid22110Jordan
| | - Dipanjan Pan
- Bioengineering DepartmentUniversity of Illinois at Urbana‐ChampaignUrbanaIL61801USA
- Department of PediatricsCenter for Blood Oxygen Transport and HemostasisUniversity of Maryland Baltimore School of MedicineHealth Sciences Research Facility III670 W Baltimore St.BaltimoreMD21201USA
- Department of ChemicalBiochemical and Environmental EngineeringUniversity of Maryland Baltimore CountyInterdisciplinary Health Sciences Facility1000 Hilltop CircleBaltimoreMD21250USA
- Department of Diagnostic Radiology and Nuclear MedicineUniversity of Maryland Baltimore School of MedicineHealth Sciences Research Facility III670 W Baltimore St.BaltimoreMD21201USA
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Wei ZQ, Xu QD, Liu Y, Huang YY, Li Y, Liu XL, Wu XT, Sheng TL. Influence of donor and acceptor substitution on the MMCT properties of binuclear cyanide bridged Schiff base compounds. Polyhedron 2022. [DOI: 10.1016/j.poly.2021.115639] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Nhon L, Shan B, Taggart AD, Wolfe RMW, Li TT, Klug CM, Nayak A, Bullock RM, Cahoon JF, Meyer TJ, Schanze KS, Reynolds JR. Influence of Surface and Structural Variations in Donor-Acceptor-Donor Sensitizers on Photoelectrocatalytic Water Splitting. ACS APPLIED MATERIALS & INTERFACES 2021; 13:47499-47510. [PMID: 34590823 DOI: 10.1021/acsami.1c11879] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Conjugated organic chromophores composed of linked donor (D) and acceptor (A) moieties have attracted considerable attention for photoelectrochemical applications. In this work, we compare the optoelectronic properties and photoelectrochemical performance of two D-A-D structural isomers with thiophene-X-carboxylic acid (X denotes 3 and 2 positions) derivatives and 2,1,3-benzothiadiazole as the D and A moieties, respectively. 5,5'-(Benzo[c][1,2,5]thiadiazole-4,7-diyl)bis(thiophene-3-carboxylic acid), BTD1, and 5,5'-(benzo[c][1,2,5]thiadiazole-4,7-diyl)bis(thiophene-2-carboxylic acid), BTD2, were employed in the study to understand how structural isomers affect surface attachments within chromophore-catalyst assemblies and their influence on charge-transfer dynamics. Crystal structures revealed that varying the position of the -COOH anchoring group causes the molecules to either contort out of a plane (BTD1) or adopt a near-perfect planar conformation (BTD2). BTD1 and BTD2 were co-loaded with either a water oxidation catalyst, [Ru(2,6-bis(1-methylbenzimidazol-2-yl)pyridine)-(4,4'-((HO)2OPCH2)2-2,2'-bipyridine)(OH2)]2, RuCt2+, or proton reduction catalyst [Ni(P2PhN2C6H4CH2PO3H2)2]2+, NiCt2+, on oxide electrodes to facilitate photodriven water splitting reactions. Emission quenching measurements indicate that both BTD1 and BTD2 inject electrons into n-type SnO2|TiO2 electrodes and holes into p-type NiO semiconductors from their respective excited states at high efficiencies >60%. Photocurrent densities of chromophore-catalyst assemblies obtained using linear sweep voltammetry (LSV) show that BTD2-sensitized photoanodes generate significantly more photocurrent than BTD1-sensitized electrodes; however, both exhibit similar performances at the photocathode. Photoelectrocatyltic measurements demonstrate that both BTD1 and BTD2 performed similarly, generating Faradaic efficiencies of 39 and 38% at the anode or 61 and 79% at the cathode. Transient absorption measurements suggest that the differences between the LSV and photoelectrocatalytic measurements result from the differences in quantum yields of the photogenerated redox equivalents, which is also a reflection of the varying metal oxide surface conformation. Our findings suggest that BTD2 should be investigated further in photocathodic studies since it has the structural advantage of being incorporated into diverse types of chromophore-catalyst assemblies.
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Affiliation(s)
- Linda Nhon
- School of Chemistry and Biochemistry, School of Materials Science and Engineering, Center for Organic Photonics and Electronics, Georgia Tech Polymer Network, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
| | - Bing Shan
- Department of Chemistry, Zhejiang University, Hangzhou 310028, China
| | - Aaron D Taggart
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Rylan M W Wolfe
- School of Chemistry and Biochemistry, School of Materials Science and Engineering, Center for Organic Photonics and Electronics, Georgia Tech Polymer Network, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
| | - Ting-Ting Li
- Research Center of Applied Solid State Chemistry, Ningbo University, Ningbo 315211, China
| | - Christina M Klug
- Center for Molecular Electrocatalysis, Pacific Northwest National Laboratory, P.O. Box 999, K2-12, Richland, Washington 99352, United States
| | - Animesh Nayak
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - R Morris Bullock
- Center for Molecular Electrocatalysis, Pacific Northwest National Laboratory, P.O. Box 999, K2-12, Richland, Washington 99352, United States
| | - James F Cahoon
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Thomas J Meyer
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Kirk S Schanze
- Department of Chemistry, University of Texas at San Antonio, San Antonio, Texas 78249, United States
| | - John R Reynolds
- School of Chemistry and Biochemistry, School of Materials Science and Engineering, Center for Organic Photonics and Electronics, Georgia Tech Polymer Network, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
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Lee D, Chua B. Soft Candy as an Electronic Material Suitable for Salivary Conductivity-Based Medical Diagnostics in Resource-Scarce Clinical Settings. ACS APPLIED MATERIALS & INTERFACES 2021; 13:43984-43992. [PMID: 34506102 DOI: 10.1021/acsami.1c11306] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Soft candy was discovered to be an excellent electronic material and was used to fabricate electrodes for salivary conductivity-based diagnostics. Using a simple molding process, a soft candy (Tootsie Roll) was made into 20 × 20 × 5 mm electrodes with a stable frequency response (0.1-100 kHz). The soft candy electrode-liquid interface circuit model was also developed for the first time. Using 0.01, 0.05, and 0.1 M phosphate-buffered saline and artificial saliva of varying conductivities, the performance of the soft candy (Tootsie Roll) electrode was evaluated. The electrode has a low temperature coefficient of ∼0.02 V/C, and the evaporation-induced mass change during measurement (<3 min) was negligible. Using a trenched surface, a limit of detection (LOD) of ∼1630 μS/cm was obtained and was lower than the saliva conductivity of a healthy adult at ∼3500 μS/cm. Thus, it is suitable for monitoring the ovulation cycle for natural family planning as well as chronic kidney disease diagnosis. Given the ubiquity of soft candy, the simplicity of the molding process, and the negligible medical waste stream, it is a more appropriate approach to diagnostics design for resource-scarce clinical settings, such as those in developing countries. The broader impact of this work will be the paradigm shift of soft candy from food to a new class of edible, moldable, high-resistivity, and stable electronic materials.
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Affiliation(s)
- Donghyun Lee
- School of Electrical Engineering, Korea University, Seoul 02841, Republic of Korea
- School of Dentistry, Pusan National University, Yangsan 50612, Republic of Korea
| | - Beelee Chua
- School of Electrical Engineering, Korea University, Seoul 02841, Republic of Korea
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Ahmad W, Wang J, Li H, Ouyang Q, Wu W, Chen Q. Strategies for combining triplet–triplet annihilation upconversion sensitizers and acceptors in a host matrix. Coord Chem Rev 2021. [DOI: 10.1016/j.ccr.2021.213944] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Wei Y, Xian H, Lv X, Ni F, Cao X, Yang C. Triplet-triplet annihilation upconversion with reversible emission-tunability induced by chemical-stimuli: a remote modulator for photocontrol isomerization. MATERIALS HORIZONS 2021; 8:606-611. [PMID: 34821277 DOI: 10.1039/d0mh01590c] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Triplet-triplet annihilation upconversion (TTA-UC) has been widely studied, but a color-tunable TTA-UC system triggered by chemical stimuli has not yet been proposed. Herein, reversible acid/base switching of the TTA-UC emission wavelength is achieved for the first time by a simple platform, composed of a direct singlet-triplet (S0-T1) absorption photosensitizer, and proton-responsive 9,10-di(pyridin-4-yl)anthracene (DPyA) as an acceptor. The photosensitizer-acceptor pair exhibits efficient UC emission (quantum yield up to 3.3%, and anti-Stokes shift up to 0.92 eV) with remarkable contrast upon base/acid treatment (Δλem,max = 82 nm, 0.46 eV). In a proof-of-concept study, the color-adjustable TTA-UC emission was applied as a remote modulator to photo-control reversible chemical reactions for the first time. This platform enriches the portfolio of color-switchable TTA-UC, and the mechanism would inspire further development of smart UC systems and extend the application field of upconversion.
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Affiliation(s)
- Yaxiong Wei
- Shenzhen Key Laboratory of Polymer Science and Technology, College of Materials Science and Engineering, Shenzhen University, Shenzhen 518060, China.
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Pokhriyal S, Biswas S. Photoresponse of CdSe-PVA nanocomposite films at low magnetic fields. NANOTECHNOLOGY 2020; 31:495205. [PMID: 32990266 DOI: 10.1088/1361-6528/abb0b7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
A set of nanocomposite films of poly-vinyl alcohol (PVA) and 0.1-0.4 wt% CdSe nanoparticles (NPs) were developed by spin coating and their surface resistance (R) was measured as a function of light illumination intensity (IL ) and applied magnetic field (H). The ferromagnetic CdSe NPs were synthesized by a facile chemical method which ensured in situ surface stabilization with a skinny layer of graphitic carbon. The CdSe NPs were uniformly dispersed in an aqueous solution of 2.0 wt% PVA and spin-coated on fluorine-doped tin oxide coated glass substrates. The photoresponse of the nanocomposite films at low H exhibits their efficacy for pertinent applications in optoelectronics.
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Affiliation(s)
- S Pokhriyal
- Department of Physics, Poornima University, Jaipur 303905, India
- Department of Physics, The LNM Institute of Information Technology, Jaipur 302031, India
| | - S Biswas
- Department of Physics, The LNM Institute of Information Technology, Jaipur 302031, India
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Wieghold S, Bieber AS, Lackner J, Nienhaus K, Nienhaus GU, Nienhaus L. One‐Step Fabrication of Perovskite‐Based Upconversion Devices. CHEMPHOTOCHEM 2020. [DOI: 10.1002/cptc.202000068] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Sarah Wieghold
- Department of Chemistry and BiochemistryFlorida State University 95 Chieftan Way Tallahassee FL 32306 USA
| | - Alexander S. Bieber
- Department of Chemistry and BiochemistryFlorida State University 95 Chieftan Way Tallahassee FL 32306 USA
| | - Jens Lackner
- Institute of Applied Physics (APH)Karlsruhe Institute of Technology (KIT) Wolfgang-Gaede-Str. 1 76131 Karlsruhe Germany
| | - Karin Nienhaus
- Institute of Applied Physics (APH)Karlsruhe Institute of Technology (KIT) Wolfgang-Gaede-Str. 1 76131 Karlsruhe Germany
| | - G. Ulrich Nienhaus
- Institute of Applied Physics (APH)Karlsruhe Institute of Technology (KIT) Wolfgang-Gaede-Str. 1 76131 Karlsruhe Germany
- Institute of Nanotechnology (INT)Karlsruhe Institute of Technology (KIT) 76344 Eggenstein-Leopoldshafen Germany
- Institute of Biological and Chemical Systems (IBCS)Karlsruhe Institute of Technology (KIT) 76344 Eggenstein-Leopoldshafen Germany
- Department of PhysicsUniversity of Illinois at Urbana−Champaign 1110 West Green Street Urbana IL 61801 USA
| | - Lea Nienhaus
- Department of Chemistry and BiochemistryFlorida State University 95 Chieftan Way Tallahassee FL 32306 USA
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Robb AJ, Knorr ES, Watson N, Hanson K. Metal ion linked multilayers on mesoporous substrates: Energy/electron transfer, photon upconversion, and more. J Photochem Photobiol A Chem 2020. [DOI: 10.1016/j.jphotochem.2019.112291] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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10
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Ye C, Gray V, Kushwaha K, Kumar Singh S, Erhart P, Börjesson K. Optimizing photon upconversion by decoupling excimer formation and triplet triplet annihilation. Phys Chem Chem Phys 2020; 22:1715-1720. [PMID: 31895392 DOI: 10.1039/c9cp06561j] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Perylene is a promising annihilator candidate for triplet-triplet annihilation photon upconversion, which has been successfully used in solar cells and in photocatalysis. Perylene can, however, form excimers, reducing the energy conversion efficiency and hindering further development of TTA-UC systems. Alkyl substitution of perylene can suppress excimer formation, but decelerate triplet energy transfer and triplet-triplet annihilation at the same time. Our results show that mono-substitution with small alkyl groups selectively blocks excimer formation without severly compromising the TTA-UC efficiency. The experimental results are complemented by DFT calculations, which demonstrate that excimer formation is suppressed by steric repulsion. The results demonstrate how the chemical structure can be modified to block unwanted intermolecular excited state relaxation pathways with minimal effect on the preferred ones.
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Affiliation(s)
- Chen Ye
- Department of Chemistry and Molecular Biology, University of Gothenburg, 41296 Gothenburg, Sweden.
| | - Victor Gray
- Department of Chemistry-Ångström Laboratory, Uppsala University, 75120, Uppsala, Sweden and Department of Physics, Cavendish Laboratory, University of Cambridge, 19 JJ Thompson Avenue, Cambridge, CB3 0HE, UK
| | - Khushbu Kushwaha
- Department of Chemistry and Molecular Biology, University of Gothenburg, 41296 Gothenburg, Sweden.
| | - Sandeep Kumar Singh
- Department of Physics, Chalmers University of Technology, 41296 Gothenburg, Sweden
| | - Paul Erhart
- Department of Physics, Chalmers University of Technology, 41296 Gothenburg, Sweden
| | - Karl Börjesson
- Department of Chemistry and Molecular Biology, University of Gothenburg, 41296 Gothenburg, Sweden.
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Duan W, Yan P, Dong J, Chen Y, He X, Chen J, Qian J, Xu L, Li H. A self-powered photoelectrochemical aptamer probe for oxytetracycline based on the use of a NiO nanocrystal/g-C3N4 heterojunction. Mikrochim Acta 2019; 186:737. [DOI: 10.1007/s00604-019-3856-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2019] [Accepted: 09/19/2019] [Indexed: 01/30/2023]
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Shan B, Nayak A, Williams OF, Yost DC, Polizzi NF, Liu Y, Zhou N, Kanai Y, Moran AM, Therien MJ, Meyer TJ. Excitation energy-dependent photocurrent switching in a single-molecule photodiode. Proc Natl Acad Sci U S A 2019; 116:16198-16203. [PMID: 31366631 PMCID: PMC6697812 DOI: 10.1073/pnas.1907118116] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The direction of electron flow in molecular optoelectronic devices is dictated by charge transfer between a molecular excited state and an underlying conductor or semiconductor. For those devices, controlling the direction and reversibility of electron flow is a major challenge. We describe here a single-molecule photodiode. It is based on an internally conjugated, bichromophoric dyad with chemically linked (porphyrinato)zinc(II) and bis(terpyridyl)ruthenium(II) groups. On nanocrystalline, degenerately doped indium tin oxide electrodes, the dyad exhibits distinct frequency-dependent, charge-transfer characters. Variations in the light source between red-light (∼1.9 eV) and blue-light (∼2.7 eV) excitation for the integrated photodiode result in switching of photocurrents between cathodic and anodic. The origin of the excitation frequency-dependent photocurrents lies in the electronic structure of the chromophore excited states, as shown by the results of theoretical calculations, laser flash photolysis, and steady-state spectrophotometric measurements.
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Affiliation(s)
- Bing Shan
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599
| | - Animesh Nayak
- Department of Chemistry, Duke University, Durham, NC 27708
| | - Olivia F Williams
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599
| | - Dillon C Yost
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599
| | - Nicholas F Polizzi
- Department of Pharmaceutical Chemistry, University of California, San Francisco, CA 94158
| | - Yanming Liu
- Key Laboratory of Industrial Ecology and Environmental Engineering, Dalian University of Technology, 116024 Dalian, China
| | - Ninghao Zhou
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599
| | - Yosuke Kanai
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599
| | - Andrew M Moran
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599
| | | | - Thomas J Meyer
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599;
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Shan B, Brennaman MK, Troian-Gautier L, Liu Y, Nayak A, Klug CM, Li TT, Bullock RM, Meyer TJ. A Silicon-Based Heterojunction Integrated with a Molecular Excited State in a Water-Splitting Tandem Cell. J Am Chem Soc 2019; 141:10390-10398. [DOI: 10.1021/jacs.9b04238] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Bing Shan
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - M. Kyle Brennaman
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Ludovic Troian-Gautier
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Yanming Liu
- Key Laboratory of Industrial Ecology and Environmental Engineering, Dalian University of Technology, Dalian 116024, China
| | - Animesh Nayak
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Christina M. Klug
- Center for Molecular Electrocatalysis, Pacific Northwest National Laboratory, P.O. Box 999, K2-12, Richland, Washington 99352, United States
| | - Ting-Ting Li
- Research Center of Applied Solid State Chemistry, Ningbo University, Ningbo 315211, China
| | - R. Morris Bullock
- Center for Molecular Electrocatalysis, Pacific Northwest National Laboratory, P.O. Box 999, K2-12, Richland, Washington 99352, United States
| | - Thomas J. Meyer
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
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