Výsledky vyhledávání - "Steve Gentemann"

Conformational and Electronic Effects of Phenyl-Ring Fluorination on the Photophysical Properties of Nonplanar Dodecaarylporphyrins

Autor: Daniel J. Nurco, and Kevin M. Smith, Vladimir S. Chirvony, Jennifer L. Retsek, Craig J. Medforth, Steve Gentemann, Dewey Holten

Publikováno v: The Journal of Physical Chemistry B. 105:6396-6411

Static and time-resolved optical measurements have been performed on a number of free-base and zinc dodecaarylporphyrins with varying degrees of fluorination of the peripheral aryl rings. These studies were performed in a variety of solvents of diffe

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::178d7fb53d83c7092434cbd82f416c33
https://doi.org/10.1021/jp004556k

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Photoinduced Evolution on the Conformational Landscape of Nonplanar Dodecaphenylporphyrin: Picosecond Relaxation Dynamics in the 1(π,π*) Excited State

Autor: c Vladimir S. Chirvony, b Craig J. Medforth, a Jennifer L. Retsek, d and Jack Fajer, a Steve Gentemann, a Dewey Holten, b Kevin M. Smith

Publikováno v: The Journal of Physical Chemistry B. 104:6690-6693

The early events following photoexcitation of the nonplanar porphyrin 2,3,5,7,8,10,12,13,15,17,18,20-dodecaphenylporphyrin (H2DPP) have been examined using transient absorption spectroscopy. These studies were motivated by previous results indicating

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::4022305511378be9dc0ebf39ccdf9594
https://doi.org/10.1021/jp001586e

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Ground and Excited State Electronic Properties of Halogenated Tetraarylporphyrins: Tuning the Building Blocks for Porphyrin-based Photonic Devices

Autor: Jonathan S. Lindsey, Dewey Holten, Jyoti Seth, Steve Gentemann, Dongho Kim, David F. Bocian, Jon Paul Strachan, Sung Ik Yang

Publikováno v: Journal of Porphyrins and Phthalocyanines. :117-147

The rational design of molecular photonic devices relies on the ability to select components with predictable electronic structure, excited state lifetimes and redox chemistry. Electronic communication in multiporphyrin arrays depends critically on t

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5a53341b85ed52aad9d7edbe8e519d14
https://doi.org/10.1002/(sici)1099-1409(199902)3:2<117::aid-jpp110>3.0.co

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Picosecond to Microsecond Photodynamics of a Nonplanar Nickel Porphyrin: Solvent Dielectric and Temperature Effects

Autor: Charles Michael Drain, Steve Gentemann, James A. Roberts, Nora Y. Nelson, Craig J. Medforth, Songling Jia, M. Cather Simpson, Kevin M. Smith, Jack Fajer, John A. Shelnutt, Dewey Holten

Publikováno v: Journal of the American Chemical Society. 120:3781-3791

The lifetime of the (dz2,dx2-y2) metal excited state of nickel(II) 5,10,15,20-tetra-tert-butylporphyrin (NiT(t-Bu)P) exhibits an extraordinary dependence on solvent dielectric properties and temperature. At room temperature, the excited-state deactiv

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::46bf021fa3ae46cb0438f230f96fe1de
https://doi.org/10.1021/ja974101h

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Effects of Orbital Ordering on Electronic Communication in Multiporphyrin Arrays

Autor: Jonathan S. Lindsey, Steve Gentemann, Jyoti Seth, David F. Bocian, Jon-Paul Strachan, William A. Kalsbeck, Dewey Holten,§ and

Publikováno v: Journal of the American Chemical Society. 119:11191-11201

The rational design of molecular photonic devices requires a thorough understanding of all factors affecting electronic communication among the various constituents. To explore how electronic factors mediate both excited- and ground-state electronic

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::f40040a4446b5023b8e05194e8157d06
https://doi.org/10.1021/ja971678q

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Variations and Temperature Dependence of the Excited State Properties of Conformationally and Electronically Perturbed Zinc and Free Base Porphyrins

Autor: Kevin M. Smith, Nora Y. Nelson, Craig J. Medforth, Daniel J. Nurco, Laurent Jaquinod, and Jack Fajer, Steve Gentemann, Dewey Holten, Sam H. Leung

Publikováno v: The Journal of Physical Chemistry B. 101:1247-1254

The photophysical properties and their temperature dependence are reported for the sterically encumbered nonplanar zinc and free base 2,3,5,7,8,10,12,13,15,17,18,20-dodecaphenylporphyrins (ZnDPP and H2DPP), and 2,3,7,8,12,13,17,18-octaethyl-5,10,15,2

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::3c0462789dadf1ef8be636015a4d61df
https://doi.org/10.1021/jp9631137

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Effects of central metal ion (Mg, Zn) and solvent on singlet excited-state energy flow in porphyrin-based nanostructures

Autor: Jyoti Seth, David F. Bocian, William A. Kalsbeck, Dewey Holten, Steve Gentemann, Jonathan S. Lindsey, Feirong Li

Publikováno v: Journal of Materials Chemistry. 7:1245-1262

Zinc porphyrins have been widely used as surrogates for chlorophyll (which contains magnesium) in photosynthetic model systems and molecular photonic devices. In order to compare the photodynamic behaviour of Mg- and Zn-porphyrins, dimeric and star-s

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::36bf2f8d49233389aa4cf8f70f6470f5
https://doi.org/10.1039/a700146k

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Unusual picosecond 1(π, π∗) deactivation of ruffled nonplanar porphyrins

Autor: Nora Y. Nelson, Kevin M. Smith, Jack Fajer, Craig J. Medforth, Tadashi Ema, Steve Gentemann, Dewey Holten

Publikováno v: Chemical Physics Letters. 245:441-447

Time-resolved and steady-state optical data are presented for metal-free meso-tetraalkylporphyrins, H 2 T(alkyl)P. Introduction of bulky tertiary-butyl or adamantyl substituents at the meso positions induces large ruffling distortions of the macrocyc

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::0a71a6565e0d983dfa4a4f207c1dbc80
https://doi.org/10.1016/0009-2614(95)01030-d

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Photophysical Consequences of Porphyrin Tautomerization. Steady-State and Time-Resolved Spectral Investigations of a Zinc Isoporphyrin

Autor: Jack Fajer, Steve Gentemann, Kevin M. Smith, Sam H. Leung, Dewey Holten

Publikováno v: The Journal of Physical Chemistry. 99:4330-4334

Isoporphyrins are porphyrin tautomers with a saturated meso carbon and thus an interrupted {pi} system. We report here steady-state optical absorption, fluorescence, and fluorescence polarization data as well as time-resolved results that detail the

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::7a6ed049a44768d7c5bda904b7504953
https://doi.org/10.1021/j100012a065

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Photophysical Properties of Conformationally Distorted Metal-Free Porphyrins. Investigation into the Deactivation Mechanisms of the Lowest Excited Singlet State

Autor: Timothy P. Forsyth, Daniel J. Nurco, Craig J. Medforth, Steve Gentemann, Jack Fajer, Dewey Holten, Kevin M. Smith

Publikováno v: Journal of the American Chemical Society. 116:7363-7368

Time-resolved and steady-state optical data are presented for a series of substituted free-base porphyrins. The porphyrins are grouped into [open quotes]normal[close quotes] and [open quotes]perturbed[close quotes] categories based on observed photop

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::77bd8638426fceae5f2bd34468aaec7c
https://doi.org/10.1021/ja00095a046

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