Photophysics Of Ru Polypyridyl Dendrimers And Polymers Of Deliberate Architecture
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Photophysics Of Ru Polypyridyl Dendrimers And Polymers Of Deliberate Architecture
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Author : Samantha Glazier
language : en
Publisher:
Release Date : 2002
Photophysics Of Ru Polypyridyl Dendrimers And Polymers Of Deliberate Architecture written by Samantha Glazier and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with categories.
Photophysics Of Ruthenium Polypyridyl Dendrimers And Polymers Of Deliberate Architecture
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Author : Samantha Glazier
language : en
Publisher:
Release Date : 2002
Photophysics Of Ruthenium Polypyridyl Dendrimers And Polymers Of Deliberate Architecture written by Samantha Glazier and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with categories.
The photophysical properties of two families of polypyridyl complexes of ruthenium were studied in both fluid solutions at 298 K and frozen glasses at 77 K. The absorption and emission spectra, excited state lifetimes and quantum yields have been obtained for poly-amidoamine based dendrimers modified with (4, 8, 16, 32 and 64) pendant-[Ru(tpy)2] +2 (tpy is 2,2':6',2 & Prime;-terpyridine) and [Ru(bpy)3]+2 (bpy is 2,2'-bipyridine) chromophores and for two 2,2 ':6',2 & Prime;-terpyridine bridging ligands, [ctpy-x-ctpy] and [ctpy-b-ctpy], with one, two or multiple Ru centers. In analogy to the behavior exhibited by the reference compounds ([Ru(tpy)2]+2 and [Ru(bpy) 3]+2), the bipyridine derivatives exhibit longer lifetimes and higher quantum yields when compared to the corresponding terpyridine complexes. In the case of dendrimers, generation-dependent changes were observed which are discussed in terms of the effects of solvent on the coupling between the emitting metal-to-ligand charge transfer state and the nearby metal-centered state. Solvent effects on the coupling were explored by comparing results in butyronitrile and dimethylacetamide with the latter being used as a mimic of the dendritic backbone. The results suggest that for the higher generations, the dendritic backbone acts as a solvent in affecting the photophysical behavior. For the family of chiral multimetallic compounds, the room temperature absorption and emission maxima of {[(( - )-ctpy)Ru]-( - )-[ctpy-b-ctpy]-[Ru(( - )-ctpy)]}(PF6)4 and (( - )-[ctpy-b-ctpy])-{[Ru(( - )-[ctpy-b-ctpy])](PF 6)2)n were shifted to lower energies and also exhibited significantly longer luminescence lifetimes when compared to the [Ru(( - )-ctpy)2](PF6)2, {[(( - )-ctpy)Ru]-( - )-[ctpy-x-ctpy]-[Ru(( - )- ctpy)]}(PF6)4 and (( - )-[ctpy-x-ctpy])-{[Ru(( - )-[ctpy-x-ctpy])](PF6) 2}n. The shifts in energy are discussed using a particle-in-a-box model. The luminescence lifetimes are discussed in terms of the accessibility of the metal-centered state. The Stern-Volmer quenching constants of the [Ru(bpy) 3]2+ pendant dendrimers were measured in the presence of three nitroaromatic quenchers (2,4,6-trinitrotoluene, 2,4-dinitrotoluene and nitrotoluene). The quenching efficiencies were calculated and found to peak for dend-16-Ru(bpy)3 corresponding to maximal chromophore accessibility. The quenching rates were dramatically enhanced by electrostatic attraction between the positively charged dendrimers and negatively charged quenchers (K3Fe(CN)6 and Na4Fe(CN)6). Investigation of the rotational anisotropy of second harmonic generation from dend-8-tpy/Fe2+ films deposited on a graphite substrate corroborated STM results showing the formation of highly ordered arrays.
Dissertation Abstracts International
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Author :
language : en
Publisher:
Release Date : 2002
Dissertation Abstracts International written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with Dissertations, Academic categories.
Final Degree List
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Author : Cornell University. Graduate School
language : en
Publisher:
Release Date : 2002
Final Degree List written by Cornell University. Graduate School and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with Dissertations, Academic categories.
Photochemistry And Photophysics Of Polymeric Materials
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Author : Norman S. Allen
language : en
Publisher: John Wiley & Sons
Release Date : 2010-03-22
Photochemistry And Photophysics Of Polymeric Materials written by Norman S. Allen and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010-03-22 with Technology & Engineering categories.
Presents the state of the technology, from fundamentals to new materials and applications Today's electronic devices, computers, solar cells, printing, imaging, copying, and recording technology, to name a few, all owe a debt to our growing understanding of the photophysics and photochemistry of polymeric materials. This book draws together, analyzes, and presents our current understanding of polymer photochemistry and photophysics. In addition to exploring materials, mechanisms, processes, and properties, the handbook also highlights the latest applications in the field and points to new developments on the horizon. Photochemistry and Photophysics of Polymer Materials is divided into seventeen chapters, including: Optical and luminescent properties and applications of metal complex-based polymers Photoinitiators for free radical polymerization reactions Photovoltaic polymer materials Photoimaging and lithographic processes in polymers Photostabilization of polymer materials Photodegradation processes in polymeric materials Each chapter, written by one or more leading experts and pioneers in the field, incorporates all the latest findings and developments as well as the authors' own personal insights and perspectives. References guide readers to the literature for further investigation of individual topics. Together, the contributions represent a series of major developments in the polymer world in which light and its energy have been put to valuable use. Not only does this reference capture our current state of knowledge, but it also provides the foundation for new research and the development of new materials and new applications.
Photophysics Of Polypyridyl Complexes Of Ru Ii Os Ii And Re I
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Author : Juan Pablo Claude
language : en
Publisher:
Release Date : 1995
Photophysics Of Polypyridyl Complexes Of Ru Ii Os Ii And Re I written by Juan Pablo Claude and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Charge transfer categories.
Polymer Photophysics
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Author : D. Phillips
language : en
Publisher: Springer
Release Date : 1985-08-31
Polymer Photophysics written by D. Phillips and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 1985-08-31 with Science categories.