Effective Transition Probability for the Faraday Effect of Lanthanide(III) Ion Solutions

Abstract

The Faraday effects of 14 lanthanide(III) ion solutions were systematically analyzed on the basis of the Faraday C term. The effective transition probability, K, which measures the magneto-optical contribution of the 4f(n) --> 4f(n-1)5d transition to the molar Verdet constant, was determined. Linear correlations between K and the square root of the molar magnetic susceptibility of the lanthanide(III) ions, chi(m)(1/2), were obtained. From the observed new regularity, K for promethium(III) was estimated.

Faraday Rotation Dispersion Measurements of Diamagnetic Organic Liquids and Simultaneous Determination of Natural Optical Rotatory Dispersion Using a Pulsed Magnetic Field

“…For example, in a previous study, the FR of an aqueous solution of rare-earth ions was measured in the visible region, and a relationship was obtained between the observed molar Verdet constant and the magnetic susceptibility of the ions. 14 The FR transition probability was attributed to the 4f n-1 5d 1 ← 4f n transition of rare-earth ions in the UV region.…”

Molecular Design Guidelines for Large Magnetic Circular Dichroism Intensities in Lanthanide Complexes

“…In the case of the MCD intensity for the 4f–5d transition, the Faraday C‐term based on the pseudo‐degenerate ground state (because of the small crystal field splitting of intra‐4f orbitals) is known to be a dominant factor for MCD intensity. Lanthanide ions (Tb III , Ho III , Dy III , Er III ) with an effective magnetic moment ( μ eff ) generally show a large MCD intensity for the 4f–5d transition . In contrast, MCD intensities of 4f–4f transitions were not correlated with an effective magnetic moment (Table ).…”

The relationship between magneto-optical properties and molecular chirality

“…In general, the Faraday C term is larger than the Faraday A and B terms. 31 The wavelengths observed in the Faraday effect measurements are associated with several 4f-4f transitions, such as 7 F 6 → 5 D 4 (488 nm), 7 F 6 → 5 D 3 (380 nm) 32 and the broad 4f-5d (below 300 nm) 33 transitions of the Tb(III) ions and the S 0 → T 1 transitions (470 nm) of the ligands. 34 The degenerate ground state is not formed by diamagnetic organic molecules such as the ligands, but rather by the paramagnetic Tb(III) ions depending on the total angular momentum, J.…”