Periodic Properties of Force Constants of Small Transition-Metal and Lanthanide Clusters

Abstract

where he is currently Professor of Chemistry. His research interests have included high-resolution optical spectroscopy, Stark effects, Raman spectroscopy, and quantum theory of momentum space. Benjamin L. Davis received a B.S. degree in Chemistry from Columbus State University in 1997 and his M.Phil. and Ph.D. degrees in Analytical Chemistry from the Graduate School of the City University of New York in 2001, where he studied photochemical hole-burning spectroscopy of porphryins and resonance Raman spectroscopy of mass-selected transition-metal clusters. He is currently a National Research Council Associate engaging in postdoctoral studies at the Naval Research Laboratory in Washington, D.C., where he is studying the light-harvesting characteristics of macromolecular dendrimers via static and time-resolved spectroscopy.

Toward an experimental bond order

“…This is a very attractive definition, due to its sheer simplicity. We have, in fact recently applied this relationship to the transition metal dimers, both in a recent review [33], and an analysis of the relationship between force constant and internuclear distance [34]. The transition metal dimers are composed of atoms with either a d N s 1 or d N21 s 2 configuration.…”

“…In order to include such promotional energy, knowledge of the configuration of the dissociation products must be obtained. This is one of the reasons force constants rather than dissociation energies are more useful for measuring bond orders [33]. The coinage metal dimers (Cu 2 , Ag 2 , and Au 2 ) must derive from atoms with a d 10 s 1 configuration.…”

“…Most of the vibrational frequencies, force constants and internuclear distances are from: Refs. [4,33,34] and for {YCu} from Ref. [58], for {ZrCo} from Ref.…”

Ferrimagnetic cagelikeFe4O6cluster: Structure determination from infrared dissociation spectroscopy

“…To overcome such problems, mass selected clusters can be embedded and accumulated in rare gas matrices. 10,11 In those experiments, interactions with the rare gas matrix may induce shifts of the absorption lines, and additionally, it cannot be excluded that structural changes during the deposition occur. Intense tunable infrared sources such as free-electron lasers allow different approaches.…”

Crystal structure of poly[aqua-(μ4-pyridine-2,5-dicarboxylato- κ5N,O:O’:O’’:O’’’)-(μ2-picolinato-κ2O:O’)-terbium(III)], C13H9N2O7Tb

“…There has been growing interest in the design and synthesis of lanthanide-based coordination polymers motivated by their fascinating structure and the exploitable applications in luminescent materials, molecular adsorption, bimetallic catalysis and so on [1][2][3][4][5][6].T he polycarboxylic ligands have been proved to be extremelyversatile organicligands due to thefactthattheycan exhibit flexible coordination modes, including chelating, bidentate bridging or chelating bridging modes [7,8]. As an extension of research toward rational design and preparation of lanthanide coordination polymer, we recently have isolated anovel three-dimensional terbium (III) coordinated polymer containing two types of ligands (pyridine-2,5-dicarboxylate and picolinate) [Tb(C 7 H 3 NO 4 )(C 6 H 4 NO 2 )(H 2 O)] n under ionothermal conditions using the ionicliquid1-ethyl-3-methylimidazolium([Emim]Br) as solvent.Asillustrated in theFigure,the asymmetricunit of title compound contains one Tb(III) cation, one pyridine-2,5-dicarboxylate anion, one picolinate anion and one coordinated water molecule.…”