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Applications of High Frequency Electron Paramagnetic Resonance on Materials from Quantum to Classical Regime

Title: Applications of High Frequency Electron Paramagnetic Resonance on Materials from Quantum to Classical Regime.
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Name(s): Wang, Zhenxing (EPR Specialist), author
Dalal, Naresh S., professor directing dissertation
Brooks, James, university representative
Kroto, Harold, committee member
Strouse, Geoffrey F., committee member
Shatruk, Michael, committee member
Department of Chemistry and Biochemistry, degree granting department
Florida State University, degree granting institution
Type of Resource: text
Genre: Text
Issuance: monographic
Date Issued: 2012
Publisher: Florida State University
Florida State University
Place of Publication: Tallahassee, Florida
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: This dissertation has focused on studying the electron spin dynamics in the quantum and classical limit and, most importantly, at the quantum-classical boundary. We have successfully used high frequency electron paramagnetic resonance (HF-EPR) techniques to characterize six paramagnetic materials with increasing number of unpaired electrons and molecular sizes. The samples studied are Mn2+-doped CdSe Quantum Dots (Mn:CdSe QDs), Na20[Cu2Pd22PV12O60(OH)8] (Cu2), Na12[X2W18Cu3O66(H2O)3].32H2O (X = As, Sb) (Cu3), [Fe7O4(O2CPh)11(dmem)2].4MeCN (Fe7), [Mn7O4(pdpm)6(N3)4](ClO4)2 (Mn7) and Na34[Mn19(OH)12(SiW10O37)6].115H2O (Mn19). Our results have illustrated that four samples including Mn:CdSe QDs, Cu2, Cu3 and Fe7 can be perfectly described with quantum mechanics while sample Mn19 behaves like a typical classical system. Most interestingly, sample Mn7 (S = 29/2) straddles the interface between the classical and quantum mechanical spin descriptions. Chapter 1 gives the motivation, overview and organization of this dissertation. Chapter 2 describes synthetic details of the materials studied, introduction of two HF-EPR spectrometers, as well as the computer simulation programs employed in this undertaking. Chapter 3 summarizes the HF-EPR studies of Mn:CdSe QDs, the first application of HF-EPR to magnetic QDs. Chapter 4 presents the structure and magnetic characterization of an octahedrally coordinated Cu(II) pair, a very rare bonding for Cu(II) ions. Chapter 5 reports the coherent manipulation of electron spins in an antiferromagnetically coupled spin triangle {Cu3} impregnated in free standing nanoporous silicon (NS) by using 240 GHz microwave pulses. Chapter 6 discusses continuous wave (cw) and pulsed HF-EPR measurements on an Fe-based magnetic cluster: Fe7. Chapter 7 describes the HF-EPR characterization of a high spin (S) compound, Mn7, whose properties straddle the interface between the classical and quantum mechanical spin descriptions. Chapter 8 reports the structure and magnetic properties of a novel, unique, discrete polyanion comprising a cationic, planar Mn19 assembly incorporated in a 60-tungsto-6-silicate. Finally, chapter 9 summarizes the major results and conclusions of this dissertation.
Identifier: FSU_migr_etd-5258 (IID)
Submitted Note: A Dissertation submitted to the Department of Chemistry and Biochemistry in partial fulfillment of the requirements for the degree of Doctor of Philosophy.
Degree Awarded: Spring Semester, 2012.
Date of Defense: March 27, 2012.
Keywords: Boundary, Classical, EPR, Quantum
Bibliography Note: Includes bibliographical references.
Advisory Committee: Naresh S. Dalal, Professor Directing Dissertation; James Brooks, University Representative; Harold Kroto, Committee Member; Geoffrey F. Strouse, Committee Member; Michael Shatruk, Committee Member.
Subject(s): Chemistry
Biochemistry
Persistent Link to This Record: http://purl.flvc.org/fsu/fd/FSU_migr_etd-5258
Use and Reproduction: This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s). The copyright in theses and dissertations completed at Florida State University is held by the students who author them.
Host Institution: FSU

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Wang, Z. (E. P. R. S. ). (2012). Applications of High Frequency Electron Paramagnetic Resonance on Materials from Quantum to Classical Regime. Retrieved from http://purl.flvc.org/fsu/fd/FSU_migr_etd-5258