木の葉に含まれる常磁性種の季節変化 ─自然の理解を深める教材の可能性─

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  • Seasonal Change in Paramagnetic Species of Various Tree Leaves: Potential Educational Materials for Understanding of Natural Science
  • 木の葉に含まれる常磁性種の季節変化 : 自然の理解を深める教材の可能性
  • コノハ ニ フクマレル ジョウ ジセイシュ ノ キセツ ヘンカ : シゼン ノ リカイ オ フカメル キョウザイ ノ カノウセイ

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Paramagnetic species in tree leaves have been detected by electron spin resonance (ESR) spectroscopy. The leaves of a maple, a cherry, a metasequoia, a fragrant olive, and a pine tree were investigated. Measurements were conducted every month from April to November in 2014. Paramagnetic Mn2+ ion was mainly detected in the maple, cherry, metasequoia, and pine leaves. The fragment olive leaves gave different paramagnetic metal ion signals predominantly. From spring to autumn, spectroscopic change in ESR spectra of the leaves were observed. Changes were in both amounts and kinds of paramagnetic species. Most characteristic monthly change was observed in the amounts of Mn2+ ion. The tendency of the change was clearly correlated with an amount of solar radiation in 2014 in Nara city. The invisible seasonal change of paramagnetic species in various tree leaves would be potential scientific materials in chemistry of high school.

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