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Book A Spectrophotometric Study of Certain Cobalt III and Chromium II Complexes

Download or read book A Spectrophotometric Study of Certain Cobalt III and Chromium II Complexes written by Ronald Arlen Garber and published by . This book was released on 1964 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book The Thermodynamics of the Formation of Chlorocomplexes of Iron III Cobalt II Iron II Manganese II and Copper II in Perchlorate Medium

Download or read book The Thermodynamics of the Formation of Chlorocomplexes of Iron III Cobalt II Iron II Manganese II and Copper II in Perchlorate Medium written by K. G. Ashurst and published by . This book was released on 1976 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book A spectrophotometric study of certain cobalt III and chromium II complexes

Download or read book A spectrophotometric study of certain cobalt III and chromium II complexes written by Ronald Arlen Garber and published by . This book was released on with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Iron III Cobalt III and Copper II Complexes with Carboxamide Ligands that Assist Characterization of Metal Peroxide Intermediates

Download or read book Iron III Cobalt III and Copper II Complexes with Carboxamide Ligands that Assist Characterization of Metal Peroxide Intermediates written by John Murray Rowland and published by . This book was released on 2002 with total page 672 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Determination of Chromium Cobalt Iron and Nickel in Alloys

Download or read book Determination of Chromium Cobalt Iron and Nickel in Alloys written by B. T. Kenna and published by . This book was released on 1963 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Some Reactions of Chromium III and Cobalt II Complexes

Download or read book Some Reactions of Chromium III and Cobalt II Complexes written by Loretta Kiel Beutelman and published by . This book was released on 1983 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book The Chemistry of Iron Cobalt and Nickel

Download or read book The Chemistry of Iron Cobalt and Nickel written by David Nicholls and published by . This book was released on 1975 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Solvent Dependence of Iron II Reduction of Some Cobalt III Complexes

Download or read book Solvent Dependence of Iron II Reduction of Some Cobalt III Complexes written by B. A. Matthews and published by . This book was released on 1975 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book SOME AMINE AND PHOSPHINE COMPLEXES OF CHROMIUM II AND CHROMIUM III

Download or read book SOME AMINE AND PHOSPHINE COMPLEXES OF CHROMIUM II AND CHROMIUM III written by DAVID ALVIN BERMAN and published by . This book was released on 1956 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Syntheses and Structures of Iron II and Cobalt II Complexes of Substituted Tetra pyrazolyl lutidine Derivatives

Download or read book Syntheses and Structures of Iron II and Cobalt II Complexes of Substituted Tetra pyrazolyl lutidine Derivatives written by Heidi Marie Tatlock and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Pentadentate ligands provide stability to metal complexes as well as a binding site for substrates that make them exceptionally useful for studying reactions. They have been used in biomimetic studies, water splitting, and small molecule activation studies. A series of six pentadentate ligands derived from a, a, a', a'-tetra(pyrazolyl)lutidine, pz4lut, with methyl substituents decorating the ligand periphery has been synthesized. These ligands were coordinated to FeIICl, and the electronic and structural properties of the resulting complexes were studied in order to deduce the effects of methyl substitution at the 3-, 4-, and 5-positions of the pyrazolyl groups and at the methine positions. When analyzed via cyclic voltammetry, the resulting complexes exhibited oxidation waves between 0.95 V and 0.75 V. It was determined that the 4-pyrazole position controls electronic effects, and the 3-pyrazolyl position controls steric effects. Substitution at the methine positions favors a low-spin FeII complex. It is thought that adding bulkier groups to the methine positions may change the coordination environment of the resulting complex. An [FeIII(OH)(pz4depy)] complex (pz4depy = a, a, a', a'-tetra(pyrazolyl)diethylpyridine) could be capable of oxidizing hydrocarbons with BDE (bond dissociation enthalpy) values less than 93 kcal/mol. A [CoII(H2O)(pz4depy)]2+ complex was shown to be capable of water oxidation via a concerted proton-electron transfer (PCET) mechanism. This complex was compared to a similar WOC, [CoII(H2O)(PY5)]2+, and found to react with water via a more favorable pathway. The BDFE(OH) (bond dissociation free energy of the OH bond) was also calculated via DFT calculations to be 76.7 kcal/mol, which is higher than that of [CoII(H2O)(PY5)]2+ by 5 kcal/mol. Further studies are needed to make sure that the catalytically active species is not CoOx nanoparticles that may have formed in solution. The [CoII(H2O)(pz4depy)]2+ complex is also thought to be capable of CH-activation reactions. This thesis demonstrates the versatility of a new pentadentate ligand family for controlling the electronic and structural properties of transition metal complexes. The data reported herein may be used to select the appropriate complex to participate in CH-activation reactions.

Book Complexes of Iron II Cobalt II Nickel II and Copper II with 2 alpha pyridylmethyleneaminomethyl pyridine

Download or read book Complexes of Iron II Cobalt II Nickel II and Copper II with 2 alpha pyridylmethyleneaminomethyl pyridine written by James Leroy Petrofsky and published by . This book was released on 1964 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book The Preparation Characterization and Chromium II Reduction of Pentaamminecobalt III

Download or read book The Preparation Characterization and Chromium II Reduction of Pentaamminecobalt III written by Robert J. Balahura and published by . This book was released on 1971 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The chromium(II) reduction of a series of pentaammine- cobalt(III) complexes has been studied. A classification into inner- or outer-sphere paths has been made and the position of attack of the reductant on the ligand determined. The oxygen-bonded complexes of formamide, N,N-dimethylform- amide, dimethylsulfoxide, and urea as well as the nitrogen bonded N-cyanoguanidine complex are reduced by means of an outer-sphere mechanism. On the other hand ligand transfer was shown to occur in the reduction of (NH[subscript 3])[subscript 5]CoNHCHO[superscript 2+], (NH[subscript 3])[subscript 5]CoNCNH[superscript 2+], (NH[subscript 3])[subscript 5]CoO[subscript 2]CNH[subscript 2][superscript 2+], (NH[subscript 3])[subscript 5]CoO[subscript 2]CC[subscript 6]H[subscript 4]CN[superscript 2+], and (NH[subscript 3])[subscript 5]CoNCO[superscript 2+]. Both outer- and inner-sphere paths operate in the reduction of the nitrile bonded 4-cyanophenol complex, the inner-sphere path comprising 20% of the overall reaction. For the reduction of the terephthalonitrile complex a classification into an inner- or outer-sphere path cannot be made/ and an outer-sphere electron transfer to the ligand is postulated as the rate-determining step. A large part of the work has been concerned with the characterization of the complexes and Chapter III describes the spectroscopic measurements undertaken as well as the chemical reactions of some of the complexes. The acid dissociation constant of the N isomer of formamidopentaamine- cobalt(III), cyanamidopentaamminecobalt(III), and the nitrile bonded 4-cyanophenol have been determined. The protonation equilibrium constant for carbamatopentaammine- cobalt(III) was also obtained. A kinetic study of the acid hydrolysis of isocyanatopentaamminecobalt(III) to form hexaamminecobalt(III) and carbon dioxide was carried out. The acylation of the cyanamide and 4-cyanophenol complexes was also studied. The results of the kinetic studies of the chromium(II) reductions indicate a possible correlation between the reduction rate and the half-wave potential for the reduction of the free ligand. The studies have led to the following generalizations regarding electron transfer reactions: (1) attack of reductant at a coordinated atom does not occur, (2) the atom attached to chromium(II) in the transition state must have two lone pairs of electrons, and (3) the reducibility of the complexed ligand plays an important role in the detailed mechanism for the transfer of the electron.