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Showing 1 to 20 of 70 for “"Mixed valence"”.
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Novel Organometallic Mixed Valence Complexes
Organometallic mixed valence complexes have been studied extensively over the past 30 years providing many synthetic and theoretical challenges. This thesis has sought to provide the field with a unique family of mixed valence complexes through which theories of electron transfer in weakly coupled …
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Electron Transfer in Mixed-Valence Metallocenes
Made available in DSpace on 2014-12-13T20:10:49Z (GMT). No. of bitstreams: 1 8009078.pdf: 6044542 bytes, checksum: dc6b33993d220ce7e220b978df6e2b85 (MD5) Previous issue date: 1979
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Electron Transfer in Mixed-Valence Binuclear Ferrocenes
A single quadrupole-splint doublet is seen in the 4.5 K Mossbauer spectrum for the triiodide salt of 3-acetylbis-(fulvalene)diiron(1+). An IT band at 7140 cm('-1) (e = 1740 M('-1) cm('-1)) is evident in the electronic absorption spectrum. A relatively isotropic EPR signal and a C-H bending band at …
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Intervalence Electron Transfer in Mixed-Valence Compounds
Made available in DSpace on 2014-12-13T20:10:38Z (GMT). No. of bitstreams: 1 7915327.pdf: 7303658 bytes, checksum: c85fc8fd2bd6d4003131a1ba7b4ef6b2 (MD5) Previous issue date: 1979
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High-Pressure Studies on Mixed-Valence Systems
Made available in DSpace on 2014-12-10T23:01:41Z (GMT). No. of bitstreams: 1 7411978.pdf: 3167745 bytes, checksum: c05af2c1219f1e9e4a5b47afae4e24cf (MD5) Previous issue date: 1973
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Electron Transfer in Oxo-Centered, Trinuclear, Mixed-Valence Iron-Acetate Complexes
… in a series of oxo-centered, trinuclear, mixed-valence complexes of the composition Fe(,3)O(O(,2)CH(,3))(,6)(L)(,3) (S), where L is an axial ligand such as pyridine or substituted pyridines and S is a solvate molecule in the solid state lattice.
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Magnetic Exchange Interactions and Mixed Valence Chemistry in Binuclear Transition Metal Complexes
Binuclear transition metal complexes are of interest because they provide a simple system in which metal-metal interactions can be studied. The importance of understanding these interactions can be seen when one considers the myriad systems which possess such interactions: biological enzymes s
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Factors affecting the rate of electron transfer in mixed-valence biferrocenium cations
Electron transfer is a fundamental chemical process. It involves the movement of localized electronic charge from one atom, ion, or molecule to another. Despite its obvious fundamental nature, its practical importance, and several decades of active research, the factors which affect or control the …
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Environmental effects on the rate of electron transfer in mixed-valence molecules
… both in the solid state and in solution about a mixed-valence complex can have a pronounced effect on the rate of intramolecular electron transfer. For 1$\sp\prime$,1$\sp{\prime\prime\prime}$-dimethylbiferrocenium triiodide hemi(iodine) it was found that the environment imposed by the …
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Two-electron mixed-valence complexes small molecule activation and photocatalytic hydrogen production
Two-electron mixed-valence complexes of rhodium may be supported by diphosphazane ligands (RN(PY2)2). Whereas diphosphazane ligands with strongly [pi]-acidic phosphine groups (Y = F, OCH2CF3) react with RhI starting materials to afford binuclear Rh20,II complexes, Rh20,II(MeN(PY)2)3X2(L) or …
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Pressure Tuning of the Electronic Spectra of Quasi-One-Dimensional Mixed Valence Semiconductors
… high pressure on the electronic spectra of the mixed valence semiconductors, K$\sb4$(Pt$\sb2$(P$\sb2$O$\sb5$H$\sb2)\sb4$X) $\cdot$3H$\sb2$O; X = Cl, Br were investigated to 10.0 GPa. Their electronic spectra consist of transitions seen in the reduced salt, …
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Mixed-valence bimetallic dithiolates of iron, cobalt, and nickel and their relevance to the hydrogenases
… largely failed to replicate any of the extensive mixed-valent states of this active site. This thesis advances this area specifically through the synthesis and examination of mixed-valent bimetallic dithiolate complexes. Chapter 2 focuses on the NiRu dithiolate compound …
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Dry Oxidation of Ferrous and Mixed-valence Smectites and Its Implications for the Oxidative History of Mars
… about past habitability. A range of ferrous and mixed-valence smectites were synthesized and then exposed to varying O2 fluxes under dry conditions to determine if Fe/Mg trioctahedral smectites can be oxidized without an aqueous medium to form dioctahedral smectites like those observed on the …
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The Effect of The Solid-State Environment on Intramolecular Electron-Transfer Rates in Mixed-Valence Complexes (Ferrocene)
… transfer between the two iron ions in the mixed-valence 1',6'-disubstituted biferrocene cation is emerging. The x-ray structures of diiodo-, dichloro-, and di-n-butylbiferrocenium triiodide salts have been determined. Two iron ions are on opposite sides of a planar fulvenide ligand. …
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Characterization of Polynuclear Mixed-Valence Manganese Complexes as Models of the Water Oxidation Site in Photosystem II
… of the photosystem II, a number of polynuclear mixed-valence manganese complexes are characterized by means of various physical methods such as electrochemistry, EPR spectroscopy and magnetic susceptibility measurements. Distributions in the weak antiferromagnetic interactions in two …
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Electron Transfer in a Series of Mixed-Valence Copper(ii)-Copper(i) Complexes (Epr, Electrochemistry, It Bands, Magnetism)
Three series of mixed-valence copper(II)-copper(I) complexes of macrocyclic ligands have been prepared to examine systematically the factors affecting intramolecular electron transfer. The mixed-valence complexes are similar to the one prepared by Gagne et. al. (J. Amer. Chem. Soc., 1979, 109, …
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Synthesis, Characterization, and Mixed-Valence Studies of Conformationally Constrained Bisferrocenyl Complexes for the Study of Through-Space S***π; Interactions
… in the extended sulfoxide system. No intervalence charge transfer band was observed in the truncated sulfoxide complex by monitoring the UV-Vis/NIR spectroscopy of the mixed valence complex, ruling out electronic communication. Thus, the through space electrostatic interactions of the …
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