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Curtis R. Hare

Bio: Curtis R. Hare is an academic researcher from University of Miami. The author has contributed to research in topics: Diatomic molecule & Metal L-edge. The author has an hindex of 7, co-authored 7 publications receiving 331 citations.


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Book ChapterDOI
TL;DR: There have been many reviews and books on electron spin resonance (ESR) and several on transition metal ions as discussed by the authors, and many of these publications have been written by physicists or theoreticians and are very comprehensive.
Abstract: Publisher Summary There have been many reviews and books on electron spin resonance (ESR) and several on transition metal ions. Many of these publications have been written by physicists or theoreticians and are very comprehensive. This review is aimed at inorganic chemists, who have had no experience relating to electron spin resonance and who are becoming more and more likely either to use the technique or to need to appreciate the significance of the information available from the technique. The first part of the review gives an elementary account of the relevant theory. There are many good books for further reading for the inorganic chemist, who wishes to go deeper into the subject. The second part of the review is a comprehensive survey of the results of ESR studies on compounds of transition elements. Inevitably, there has had to be some selection of material, and the criteria for inclusion or rejection has been based upon the likely interest of an inorganic chemist might have in the species. This is particularly in the areas, where there is a lot of related work, e.g., the Mn2+ host-lattice data. In the case of copper dg complexes, there has been much duplication of work and papers devoted to the spectra of complexes where a minor substitutive change has been made to a bulky organic ligand.

481 citations

Journal ArticleDOI
Tong Ren1
TL;DR: In this article, the basic electronic properties of σ-alkynyl compounds of Ru2(LL)4 were elucidated on the basis of solution voltammetry and absorption spectroscopy, which revealed rich redox characteristics and small energy gaps ranging from 1.2 to 1.6 eV.

261 citations

Book ChapterDOI
09 Mar 2007
TL;DR: In this paper, it was shown that the Laporte-forbidden bands of transition group complexes can be adapted to the strong Laportes-allowed bands, at least in the octahedral complexes of a central ion with six halide ligands.
Abstract: W H I L E the weak, Laporte-forbidden bands of transition group complexes have been successfully described by the ligand field theory, with the interest concentrated on the partly filled shell, it has only recently been demonstrated that M.O. theory is equally well adapted to the strong, Laporte-allowed bands, at least in the octahedral complexes of a central ion with six halide ligands. Qualitatively, a satisfactory description of these strong bands may be given by saying that their wave number decreases, the more oxidizing the central ion and the more reducing the ligands. This is exactly as expected for electron transfer from the ligand to the central ion during optical excitation. It is a redox process, decreasing the oxidation number of the central ion by one, while the ligand field bands correspond to the same oxidation number in the excited and the ground state. Consequently, the d n -systems with η < 10, i.e. a partly filled shell which can take up an electron, have the much lower wave numbers of these bands than the corresponding d 1 0 -systems. Two review papers have been written by Rabinowitch (1942) and Orgel (1954). However, these papers were not very much concerned with complexes of metals, but rather with the absorption spectra of crystalline, dissolved and gaseous alkali halides, and with some molecular addition compounds occurring in organic chemistry, etc. There has always been a close connexion between the study of electron transfer spectra and photochemical reactions: the change of oxidation number in the excited state may make it chemically a very reactive entity; other reactions may be started, or ligands dissociated off, often with changed oxidation number. Fajans, Fromherz, and their assistants made a thorough study of the halide complexes of d 1 0 -systems such as Cu(I), Ag(I), Hg(II), and d 1 0 s 2 -systems such as Sn(II), T1(I), Pb(II). In this way, some confusion arose between the genuine electron transfer bands of the former systems and the particular s 2 -> sp transitions to be discussed in the next chapter, in the latter case. However, it was realized that the bands of CI", Br" and I" (as known in aqueous solution or in

248 citations

Book ChapterDOI
06 Oct 2011
TL;DR: The ligand field theory of multiple bonding in oxo-metal ions, which was formulated in Copenhagen 50 years ago, predicts that there must be an “oxo wall” between Fe-Ru-Os and Co-Rh-Ir in the periodic table.
Abstract: The dianionic oxo ligand occupies a very special place in coordination chemistry, owing to its ability to donate π electrons to stabilize high oxidation states of metals. The ligand field theory of multiple bonding in oxo-metal ions, which was formulated in Copenhagen 50 years ago, predicts that there must be an “oxo wall” between Fe–Ru–Os and Co–Rh–Ir in the periodic table. In this tribute to Carl Ballhausen, we review this early work as well as new developments in the field. In particular, we discuss the electronic structures of beyond-the-wall (groups 9 and 10) complexes containing metals multiply bonded to O- and N-donor ligands.

199 citations