Electron Spin Resonance Spectroscopy of Single Crystals of Concanavalin A

Eva Meirovitch, Zeev Luz, A. Joseph Kalb

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Abstract

An electron spin resonance (esr) study, at 35 GHz, of single crystals of Mn2+,Ca2+-concanavalin A is reported. The Mn2+spectrum is interpreted in terms of a spin hamiltonian with an isotropic g tensor, nearly isotropic hyperfine tensor, and a quadratic zero field splitting (ZFS) interaction. The ± 5/2 ↔ ±3/2 and ±3/2 ↔ ±½ fine structure transitions are highly broadened by a large distribution in the ZFS parameters, making a quantitative interpretation of these lines impractical. The ½ ↔ — ½ transitions are relatively sharp and show sufficient second-order effects to allow a detailed study of the magnetic parameters of the Mn2+ions. These are: gMn= 2.0009, A||= 94.4 G, A= 91.5 G, D = 232 G, and λ = E/D = 0.185. The distribution in the ZFS parameters is estimated to be ≤80 G and ≤5° in the magnitude and direction of its major component. It is suggested that this spread reflects a distribution in the local ligand structure of the metal binding site.

Original languageEnglish
Pages (from-to)7538-7542
Number of pages5
JournalJournal of the American Chemical Society
Volume96
Issue number24
DOIs
StatePublished - 1 Nov 1974
Externally publishedYes

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