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Full-Text Articles in Chemistry
Evaluation Of Earth-Abundant Monometallic And Bimetallic Complexes For Catalytic Water Splitting, Kenneth Kwame Kpogo
Evaluation Of Earth-Abundant Monometallic And Bimetallic Complexes For Catalytic Water Splitting, Kenneth Kwame Kpogo
Wayne State University Dissertations
The development of affordable water splitting catalysts from Earth-abundant transition metal ions such as Co and Mn is of immense scientific interest. Aiming to develop an efficient water splitting catalyst, a Co(II) complex featuring an asymmetric, pentadentate quinolyl-bispyridine ligand with a phenylenediamine backbone was synthesized and characterized by spectroscopic, spectrometric, and X-ray analysis. The Co ion was selected because of its ability to undergo redox conversions from 3d5 CoIV through 3d8 CoI thereby making it a suitable catalyst that can withstand harsh structural and electronic changes during catalysis. The electrocatalytic water reduction activity of the catalyst at neutral pH gave …
Chalcogenide Nanocrystal Assembly: Controlling Heterogeneity And Modulating Heterointerfaces, Jessica Davis Davis
Chalcogenide Nanocrystal Assembly: Controlling Heterogeneity And Modulating Heterointerfaces, Jessica Davis Davis
Wayne State University Dissertations
This dissertation work is focused on developing methods to facilitate charge transport in heterostructured materials that comprise a nanoscale component. Multicomponent semiconductor materials were prepared by (1) spin coating of discrete nanomaterials onto porous silicon (pSi) or (2) self-assembly. Spin-coating of colloidal quantum dot (QD) PbS solutions was employed to create prototype PbS QD based radiation detection devices using porous silicon (pSi) as an n-type support and charge transport material. These devices were initially tested as a photodetector to ascertain the possibility of their use in high energy radiation detection. Short chain thiolate ligands (4-fluorothiophenolate) and anion passivation at the …
Water Splitting Using Cobalt-Based Amidopyridine Complexes, Habib Baydoun
Water Splitting Using Cobalt-Based Amidopyridine Complexes, Habib Baydoun
Wayne State University Dissertations
As part of the ongoing search for clean energy sources, splitting water into oxygen and hydrogen has emerged as a promising source of alternative energy. We are interested in developing electrocatalysts capable of performing water reduction and water oxidation. In this dissertation, a variety of catalytic platforms based on an amidopyridine framework are studied. A novel monomeric cobalt complex in an amidopyridine ligand environment, ([CoIII(L1)(pyrr)2]PF6), was investigated for electrocatalytic water reduction and found to have an onset overpotential of 0.54 V and an observed TOF of 23 min-1. The catalytic decomposition pathway was explored with the aim of designing more …
Synthesis Of Low-Coordinate Transition Metal Bis(Alkoxide) Complexes And Their Reactivity Toward Small Molecules, Maryam Yousif
Synthesis Of Low-Coordinate Transition Metal Bis(Alkoxide) Complexes And Their Reactivity Toward Small Molecules, Maryam Yousif
Wayne State University Dissertations
This dissertation focused on the synthesis of new transition metal complexes in bis(alkoxide) ligand environments and the investigation of their reactivity in nitrene-group transfer catalysis and small molecule activation. Treatment of Cr(N(SiMe3)2)2(THF)2 with two equivalents of HOR (OR = OCtBu2Ph) led to the formation of the chromium(II) alkoxide dimer, Cr2(OR)4. Upon the reaction with bulky aryl and alkyl azides, Cr2(OR)4 led to the stable Cr(IV) mono(imido) complexes, Cr(OR)2(NR), featuring trigonal planar metal centers. In contrast, less bulky aryl azides led to the formation of chromium (VI) bis(imido) complexes Cr(OR)2(NR)2, independent of the amount of azide used. Chromium(IV) mono(imido) species Cr(OR)2(NR) …
Ln(Ii)-Containing Cryptates: Synthesis And Properties, Akhila Nuwan Wijerathne Kuda-Wedagedara
Ln(Ii)-Containing Cryptates: Synthesis And Properties, Akhila Nuwan Wijerathne Kuda-Wedagedara
Wayne State University Dissertations
LNII-CONTAINING CRYPTATES: SYNTHESIS AND PROPERTIES
by
AKHILA N. W. KUDA-WEDAGEDARA
May 2016
Advisor: Dr. Matthew J. Allen
Major: Chemistry
Degree: Doctor of Philosophy
Research projects described in this dissertation are focused on studying the physicochemical properties, including the photochemical, redox, and magnetic properties, of LnII-containing cryptates and how ligand structure influences metal–ligand interactions that in turn influence physicochemical properties. The results of these studies enable tailoring of the coordination properties of metal complexes that are important in applications including luminescent materials, chemical reductions, catalysis, and imaging.
A EuII-containing cryptate 2.1-EuII synthesized with an amine-rich ligand displayed bright yellow luminescence in …
Selective Atomic Layer Deposition Of Transition Metal Thin Films, Marissa Marie Kerrigan
Selective Atomic Layer Deposition Of Transition Metal Thin Films, Marissa Marie Kerrigan
Wayne State University Dissertations
Atomic layer deposition (ALD) affords highly conformal thin films with precise thickness control due to its self-limited growth mechanism. ALD enables the increasing demands for smaller feature sizes in microelectronics devices to be met. Area-selective ALD growth is receiving attention in the fabrication of microelectronic devices, since it can eliminate complicated etching steps from the fabrication process and minimizes expensive and toxic reagent use. Selectivity can be achieved by tailoring the surface chemistry of the precursor and substrate. To date, few area-selective ALD processes have been reported for metallic films. Thin films of cobalt metal deposited selectively are of considerable …