Electronic absorption and magnetic circular dichroism spectra of ferrocene

Abstract

The magnetic circular dichroism (MCD) spectrum of ferrocene in cyclohexane solution is measured using a Cary 60 spectropolarimeter with a CD attachment and superconducting solenoid, with computer analysis of the data in the uv and visible regions. It is compared with solution and vapor phase data for ordinary absorption in the same regions. MCD reveals five more transitions than does the absorption data for a ferrocene solution, and also reveals three more transitions than does vapor phase absorption data. The MCD spectrum of acetylferrocene is also discussed and used as support for the interpretation of the ferrocene data. Possible assignments are discussed.

Ferrocene‐Based Trimethylsilyl Chalcogenide Reagents for the Assembly of Functionalized Metal–Chalcogen Architectures

“…The spectra of each display three characteristic maxima: a relatively broad maximum at 304-311 nm, a shoulder at 344-346 nm, and a broad absorption at 441-445 nm. The three absorption bands are typical of similar substituted ferrocenes containing a carbonyl moiety, such as acetylferrocene, [25,26] with the absorption at 344-346 nm characteristic Figure 9. Core of 14. www.chemeurj.org of the carbonyl group.…”

Novel organometallic chalcones functionalized with a crown ether fragment as optical ion chemosensors

“…These chalcones exhibit similar spectroscopic features in acetonitrile. They present an intense metal‐to‐ligand charge transfer (MLCT) band centered in the 350 nm region and lower intensity bands, assigned to a π–π* transition ( λ ~ 250 nm), characteristic of conjugated ketones, and a shoulder assigned to an n–π* forbidden transition ( λ ~ 280 nm) (Figure ) …”

“…They present an intense metal-to-ligand charge transfer (MLCT) band centered in the 350 nm region and lower intensity bands, assigned to a π-π* transition (λ~250 nm), characteristic of conjugated ketones, and a shoulder assigned to an n-π* forbidden transition (λ~280 nm) ( Figure 2). [27][28][29] The ability of the crown ether metalloligands 1 and 2 to bind several metal ions such as Li + , Na + , K + , Mg 2+ , Ca 2+ , Ba 2+ and Pb 2+ was investigated using UV-visible and luminescence measurements in acetonitrile ( Figure 3). The cations studied were selected considering Pearson HSAB theory and the spectral perturbation generated after addition of one equivalent of these analytes.…”

Dynamical Properties of the Molecular Crystals with Electrostatic Interaction Taken into Account. Low Pressure Ice Phases (Ih and Ic)

“…Thus, up t o now a technique has been developed which allows t o describe the dynamics of molecular crystals in atom-atom potential approximation, where the potentials may include, besides the short-range, also Coulomb interaction. However, it was pointed out in [7] that some formulae given in [SJ were incorrect. According t o the authors of [7], the error results from the incorrectly written condition that a rotation of the entire crystal cannot produce any torque on the molecules.…”

“…However, it was pointed out in [7] that some formulae given in [SJ were incorrect. According t o the authors of [7], the error results from the incorrectly written condition that a rotation of the entire crystal cannot produce any torque on the molecules. I n [7J the corresponding correct formulae are given without proof, only for q : 0 .…”