Sun, Wenfang - North Dakota State University - Department of Chemistry and Biochemistry

个人简介

BS, Wuhan University, China, 1990 PhD, Institute of Photographic Chemistry, Chinese Academy of Sciences, 1995 Postdoctoral Fellow, University of Alabama, Birmingham, 1997-1999

研究领域

Organic/Metal-Organic Materials Chemistry Our research focuses on the synthesis and characterization of photofunctional organic/metallo-organic materials for optical limiting and/or photodynamic therapy applications. Optical limiting materials are nonlinear optical materials that can transmit most of the light at low intensities, but absorb, reflect, refract, or scatter light at high incident intensities for the protection of human eyes and optical sensors. Nonlinear absorption, particular reverse saturable absorption and two-photon absorption, has long been recognized as useful for optical limiting, however, it is not currently possible to a-prior design molecules that exhibit large nonlinear absorption. To remedy this deficiency, the relationship between nonlinear absorption and molecular structure must be explored. Organic/metallo-organic complexes are ideal candidates for this application because of their large, fast, and broadband optical nonlinearity. In addition, the chemical structures of these complexes can be easily modified. The complexes currently under study include nanoparticle-expanded metalloporphyrin composites, transition-metal terpyridyl acetylide complexes (Figure 1), polyads, and dendrimers, and stilbazolium derivatives. This project involves organic synthesis, spectroscopic studies (UV-Visible absorption, transient absorption, fluorescence and phosphorescence), and nonlinear optical characterization (using degenerate four wave mixing, Z-scan and nonlinear absorption techniques).

近期论文

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Z. Ji, Y. Li, T. M. Pritchett, N. S. Makarov, J. E. Haley, Z. Li, M. Drobizhev, A. Rebane, W. Sun*, “Photophysics and Two-photon Absorption of 4-[9,9-Di(2-ethylhexyl)-7-diphenylaminofluoren-2-yl]-2,2′:6′,2′′-terpyridine and Their Platinum Chloride Complexes”, Chem. Eur. J. 17(8), 2479-2491 (2011). Z. Ji, S. Li, Y. Li, W. Sun*, “Back-to-back dinuclear platinum terpyridyl complexes: Synthesis and photophysical studies”, Inorg. Chem. 49(4), 1337-1346 (2010). P. Shao, Y. Li, J. Yi, T. M. Pritchett, W. Sun*, “Cyclometalated Platinum 6-Phenyl-4-(9,9-dihexylfluoren-2-yl)-2,2′-bipyridine Complexes: Synthesis, Photophysics and Nonlinear Absorption”, Inorg. Chem. 49, 4507-4517 (2010). W. Sun*, B. Zhang, Y. Li, T. M. Pritchett, Z. Li, J. E. Haley, “Broadband Nonlinear Absorbing Platinum 2,2′-Bipyridine Complex Bearing 7-(Benzothiazol-2′-yl)-9,9-diethyl-2-ethynylfluorene Ligands”, Chem. Mater. 22, 6384-6392 (2010). R. Liu, Y. Li, Y. Li, H. Zhu, W. Sun,* “Photophysics and Nonlinear Absorption of Cyclometalated Platinum(II) 6-Phenyl-2,2'-bipyridyl Complexes with Different Acetylide Ligands”, J. Phys. Chem. A 114(48), 12639-12645 (2010). I. Mathew, W. Sun*, “Photophysics and vapochromic effect of Pt(II) 2,6-bis(N-alkylbenzimidazol-2′-yl)pyridine complexes with different alkyl chains and counter ions”, Dalton Trans. 39, 5885-5898 (2010). J. Yi, B. Zhang, P. Shao, Y. Li, W. Sun*, “Synthesis and Photophysics of Platinum(II) 6-Phenyl-4-(9,9-dihexylfluoren-2-yl)-2,2′-bipyridine Complexes with Phenothiazinyl Acetylide Ligand”, J. Phys. Chem. A 114, 7055-7062 (2010). T. M. Pritchett*, W. Sun, B. Zhang, M. J. Ferry, Y. Li, J. E. Haley, D. Mackie, W. Shensky, A. G. Mott, “Excited-state absorption of a bipyridyl platinum(II) complex with alkynyl-benzothiazolylfluorene units”, Opt. Lett. 35(9), 1305-1307 (2010). I. Mathew, Y. Li, W. Sun*, “Dinuclear Platinum(II) 4,6-Diphenyl-2,2’-bipyridine Complexes Tethered by Rigid Bridging Ligand: Synthesis and Photophysics in Solution and in LB Film”, Dalton Trans. 39, 11210-11209 (2010). W. Sun*, Y. Li, T. M. Pritchett, Z. Ji, J. Haley, “Excited-state absorption of 4′-(5′′′-R-pyrimidyl)-2,2′:6′,2′′-terpyridyl platinum(II) phenylacetylide complexes”, Nonlinear Optics, Quantum Optics: Concepts in Modern Optics 40, 163-174 (2010). R. Subramaniam, Y. Xiao, Y. Li, S. Qian, W. Sun, S. Mallik*, “Synthesis of coumarin-based UV one-photon and NIR two-photon cleavable lipids”, Tetrahedron. Lett. 51, 529-532 (2010). B. Wang, A. Raphael, Y. Li, A. Singh, H. Lee, W. Sun* and P. R. Sharp*, “Remarkable bromination and blue-emission of 9-anthracenyl Pt(II) complexes”, J. Am. Chem. Soc. 131(9), 3150-3151 (2009). P. Shao, Y. Li, A. Azenkeng, M. Hoffmann, W. Sun*, “Influence of Alkoxyl Substituent on 4,6-Diphenyl-2,2’-bipyridine Ligand on Photophysics of Cyclometalated Platinum(II) Complexes: Admixing Intraligand Charge Transfer in Low-lying Excited States”, Inorg. Chem.. 48(6), 2407-2419 (2009). H. Zhang, B. Zhang,Y. Li, W. Sun,* “Acid-Sensitive Pt(II) 2,6-Di(pyridin-2-yl)pyrimidin-4(1H)-one Complexes”, Inorg. Chem. 48(8), 3617-3627 (2009). Z. Ji, A. Azenkeng, M. Hoffmann, W. Sun*, “Synthesis and Photophysics of 4′-R-2,2′;6′,2″-terpyridyl (R = Cl, CN, N(CH3)2) Platinum(II) Phenylacetylide Complexes”, Dalton Trans. 7725-7733 (2009). I. Mathew, W. Sun*, “Photophysics of Pt(II) 4,6-Dipheny-2,2’-bipyridyl Complexes in Solution and LB Film”, J. Organometallic Chem. 694, 2750-2756 (2009). Y. Li, T. M. Pritchett, P. Shao, J. Haley, H. Zhu, W. Sun*, “Excited-state absorption of mono-, di- and tri-nuclear cyclometalated platinum 4,6-diphenyl-2,2’-bipyridyl complexes”, J. Organometallic Chem. 694, 3688-3691 (2009). Q. Dai, Y. Li, L. Zhai*, W. Sun*, “3,4-Ethylenedioxythiophene (EDOT)-Based π-Conjugated Oligomers: Facile Synthesis and Excited-state Properties”, J. Photochem. Photobio. A: Chemistry 206, 164-168 (2009) Z. Ji, Y. Li, W. Sun* “Acid/base sensitive platinum terpyridyl complex: Switching between metal-to-ligand charge transfer (MLCT), ligand-to-ligand charge transfer (LLCT), and intraligand charge transfer (ILCT) states”, J. Organometallic Chem. 694, 4140-4145 (2009). T. Lu, P. Shao, I. Mathew, A. Sand, W. Sun*, “Synthesis and Photophysics of Benzotexaphyrin: A Near-IR Photosensitizer and Emitter”, J. Am. Chem. Soc. 130(47), 15782-15783 (2008). Y. Li, D. Dini, M. J. F. Calvete, M. Hanack, W. Sun*, “Photophysics and Nonlinear Optical Properties of Tetra- and Octabrominated Silicon Naphthalocyanines.”, J. Phys. Chem. A. 112(3), 472-480 (2008).