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Valency

About: Valency is a research topic. Over the lifetime, 1632 publications have been published within this topic receiving 26141 citations.


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Journal ArticleDOI
TL;DR: The first experiments to observe and analyze the coalescence of ν(CO) band shapes in the 1D IR spectra of mixed-valence complexes of the type {[Ru3O(OAc)6(CO)(L)]2-BL}(-), to estimate rate constants of intramolecular electron transfer (ET).
Abstract: This article describes research from our laboratory on the chemistry and spectroscopic properties of inorganic mixed-valence complexes. After a brief review of the seminal work of Taube, Creutz, Day, Robin, Hush, and others in the 1960s and the confounding efforts to identify the borderline between class II and III mixed-valence systems in the 1990s and early 2000s, we describe our first experiments to observe and analyze the coalescence of ν(CO) band shapes in the 1D IR spectra of mixed-valence complexes of the type {[Ru3O(OAc)6(CO)(L)]2-BL}−, where L = a pyridyl ligand and BL = pyrazine or 4,4′-bipyridine, to estimate rate constants of intramolecular electron transfer (ET). The strong involvement of the bridging ligands in mixed-valence complexes of this type was first identified in the appearance of totally symmetric vibrational modes of pyrazine bridging ligands in the IR because of strong vibronic coupling within a three-state metal cluster–bridge–metal cluster model. Application of the Brunschwig–Cr...

68 citations

Journal ArticleDOI
TL;DR: In this article, the dependence of total π-electron energy, πelectron charge distribution and free valency indices of conjugated hydrocarbons on molecular topology was investigated.

67 citations

Journal ArticleDOI
TL;DR: In this paper, the substitution of La 3+ for Ba 2+ or Sr 2+ in X Fe 12 O 19 is associated with a valency change of Fe 3+ to Fe 2+ at the 2 a or 4 f 2 site Temperature dependences of the hyperfine fields at various sublattices are given

67 citations

Journal ArticleDOI
TL;DR: In this paper, a comparison of the La 3d core level spectrum with those of various La trihalides showed that the La is trivalent, with the sC82d 32 providing an environment slightly less electronegative than that in LaBr 3.
Abstract: 82 in agreement with the observation of a signal in electron spin resonance experiments [4 ‐ 6]. This view is also consistent with theoretical predictions [9] and with the analysis of the electron density distribution of a Y@C82 microcrystal as measured by x-ray diffraction [10]. Very few direct studies of the valency of the various endohedral metal ions have been reported. Xray photoemission spectroscopy (XPS) has been shown to be a suitable probe of the valency of the La in La@C82 [5,11]. In this case, the comparison of the La 3d core level spectrum with those of various La trihalides showed that the La is trivalent, with the sC82d 32 providing an environment slightly less electronegative than that in LaBr 3 [11]. In the case of the lanthanide monometallofullerene Tm@C82, a series of physical and chemical studies in solution of the three different isomers has been found to be consistent with a Tm 21 @C 22

67 citations

Journal ArticleDOI
TL;DR: The observed differences favor the view that the intrinsic functional properties of a and β chains of human hemoglobin are not equivalent, and two complementary valency hybrids are found to be different from each other with respect to oxygen affinity and Bohr ionizations.

66 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202377
2022190
202119
202029
201937
201829