研究领域
Physical Chemistry/Materials Chemistry
Our research group is engaged in studies of energy-transducing systems including heme and photosynthetic proteins, synthetic light-harvesting arrays, molecular photonic devices, and electrically addressable molecular memories. We are also interested in the characterization of the structural, electronic, and magnetic properties of metallotetrapyrroles and other transition metal complexes and in the elucidation of the molecular structure and organization of monolayer assemblies of partially oriented systems. The investigative strategy common to all of our work is the implementation of a variety of techniques in order to provide a broad base of information that can be used to characterize the physical properties of the systems thoroughly and rigorously. These techniques include resonance Raman, infrared, absorption and electron paramagnetic resonance spectroscopies as well as electrochemical methods. The long-term goal is to provide a basis for relating the physical properties of the systems to their functional behavior (redox, ligand binding, light-energy conversion, energy/electron transfer, optoelectronic gating, information storage).
Heme and Other Metalloproteins: Heme and other metalloproteins that contain tetrapyrroles (porphyrins, chlorins, corphinoids) perform a wide variety of biochemical functions. We are performing spectroscopic studies on a variety of proteins including myoglobin, hydroxylamine oxido-reductase, and methyl coenzyme-M reductase in order to elucidate the physico-chemical properties of the active sites. Certain of these studies involve wild-type as well as genetically modified proteins.
Photosynthetic Proteins: Photosynthetic proteins convert light into chemical energy in certain bacteria and higher plants. We are conducting vibrational studies on reaction centers from various bacteria, including Rb. sphaeroides, Rb. capsulatus and Rps. viridis, and on the photosystem I and II core complexes from higher plants. These data are being used for a detailed characterization of the structural properties of the (bacterio)chlorin cofactors and how these properties are influenced by pigment-protein interactions. All of these studies involve wild-type as well as genetically modified proteins.
Porphyrin-Based Molecular Photonic Devices: Electronic interactions between porphyrinic p systems in close proximity play a pivotal role in such diverse systems as photosynthetic proteins, artificial light-harvesting systems, and organic conductors. We are examining a variety of synthetic stacked and bridged dimeric, trimeric and multimeric porphyrinic arrays using optical, vibrational, and magnetic spectroscopies. Our efforts are directed at probing electronic communication in these assemblies with the aim of developing a strategy for the rational design and construction of nanoscale photonic devices.
Porphyrin-Based Molecular Memories: The continued miniaturization of information processing systems requires the development of components with feature sizes of less than 0.1 micron. While such feature sizes will most likely be achieved with projected technologies, it is uncertain whether devices that rely on the bulk properties of semiconductor materials will retain the required functional characteristics at these dimensions. Accordingly, there is much interest in using molecules to replace semiconductor materials. Our efforts in this area focus on the use of porphyrins as information storage media in next-generation memory elements.
近期论文
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"Probing Electronic Communication in Covalently Linked Multiporphyrin Arrays. A Guide to the Rational Design of Molecular Photonic Devices," Dewey Holten, David F. Bocian, and Jonathan S. Lindsey, Acc. Chem. Res. 2002, 35, 57-65.
"Characterization of Porphyrin Surface Orientation in Monolayers on Au(111) and Si(100) using Spectroscopically Labeled Molecules,"Jieying Jiao,Patchanita Thamyongkit,Izabela Schmidt,Jonathan S. Lindsey, and David F. Bocian, J. Phys. Chem. C2007, 111, 12693-12704.
"Accessing the Near-Infrared Spectral Region with Stable, Synthetic, Wavelength-Tunable Bacteriochlorins," Masahiko Taniguchi, David L. Cramer, Anil D. Bhise, Hooi Ling Kee, David F. Bocian, Dewey Holten, and Jonathan S. Lindsey, New J. Chem.2008, 32, 947-958.
"Effects of Counterion Mobility, Surface Morphology, and Charge Screening on the Electron-Transfer Rates of Porphyrin Monolayers," Jieying Jiao, Eric Nordlund, Jonathan S. Lindsey, and David F. Bocian, J. Phys. Chem. C2008, 112, 6173-6180.
"Probing the Rate of Hole Transfer in Oxidized Porphyrin Dyads Using Thallium Hyperfine Clocks," James R. Diers, Masahiko Taniguchi, Dewey Holten, Jonathan S. Lindsey,and David F. Bocian, J. Am. Chem. Soc.2010, 132, 12121-12132.
"The Light-Harvesting Antenna System from the Phototrophic Bacterium Roseiflexus castenholzii," Aaron M. Collins, Pu Qian, Qun Tang, David F. Bocian, C. Neil Hunter and Robert E. Blankenship, Biochemistry2010, 49, 7524-7531.
"Activation Energies for Oxidation of Porphyrin Monolayers Anchored to Au(111)," Jieying Jiao, Masahiko Taniguchi, Jonathan S. Lindsey, and David F. Bocian, Langmuir2010, 26, 15718-15721.
"Structural Characteristics that Make Chlorophylls Green: Interplay of Hydrocarbon Skeleton and Substituents," Olga Mass, Masahiko Taniguchi,Marcin Ptaszek, Joseph W. Springer, Kaitlyn M. Faries, James R. Diers, David F. Bocian, Dewey Holten, and Jonathan S. Lindsey, New J. Chem.2011, 35, 76-88.
"De Novo Synthesis and Photophysical Characterization of Annulated Bacteriochlorins. Mimicking and Extending the Properties of Bacteriochlorophylls," Michael Krayer, Eunkyung Yang, James R. Diers, David F. Bocian, Dewey Holten, and Jonathan S. Lindsey, NewJ. Chem.2011, 35, 587-601.
"Photophysical Properties and Electronic Structure of Stable, Tunable Synthetic Bacteriochlorins: Extending the Features of Native Photosynthetic Pigments," Eunkyung Yang,Christine Kirmaier,Michael Krayer,Masahiko Taniguchi, Han-Je Kim, James R. Diers,David F. Bocian,Jonathan S. Lindsey,and Dewey Holten, J. Phys. Chem. B2011, 115, 10801-10816.
"Molecules for Charge-Based Information Storage," Jonathan S. Lindsey and David F. Bocian, Acc. Chem. Res.2011,44, 638-650.
"De novo Synthesis and Properties of Analogues of the Self-Assembling Chlorosomal Bacteriochlorophylls," Olga Mass,Dinesh Pandithavidana,Marcin Ptaszek,Koraliz Santiago, Joseph W. Springer,Jieying Jiao,Qun Tang, Cristine Kirmaier, David F. Bocian,Dewey Holten,and Jonathan S. Lindsey, New J. Chem. 2011,35, 2671-2690.
"Biohybrid Photosynthetic Antenna Complexes for Enhanced Light-Harvesting," Joseph W. Springer,Pamela S. Parkes-Loach,Kanumuri Ramesh Reddy,Michael Krayer,Jieying Jiao, Gregory M. Lee,Dariusz M. Niedzwiedzki, Michelle A. Harris, Christine Kirmaier,David F. Bocian,Jonathan S. Lindsey,Dewey Holten,and Paul A. Loach, J. Am. Chem. Soc.2012, 134, 4589-4599.
"Synthesis and Physicochemical Properties of Metallobacteriochlorins," Chih-Yuan Chen, Erjun Sun, Dazhong Fan, Masahiko Taniguchi, Brian E. McDowell, Eun Kyung Yang, James R. Diers, David F. Bocian, Dewey Holten, and Jonathan S. Lindsey, Inorg. Chem.2012, 51, 9443-9464.
"Effects of Linker Torsional Constraints on the Rate of Ground-State Hole Transfer in Porphyrin Dyads," Christopher J. Hondros, Kunche Aravindu, James R. Diers, Dewey Holten, Jonathan S. Lindsey, and David F. Bocian, Inorg. Chem.2012, 51, 11076-11086.
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