顔料結晶における励起子相互作用とJ会合体との関連性について

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特集：光機能性材料における色素J会合体の化学分子の“吸収係数”が大きく，これらが“周期的に配列”した顔料結晶や色素の会合体では，励起分子の間に強い相互作用が起こる．この相互作用は励起子相互作用（“遷移モーメント間の相互作用”）と呼ばれ，吸収帯のシフトや分裂（Davydov分裂）を誘起する．本講では励起子相互作用の理論を概観し，シアニン色素のJ 会合体を含め，いくつかの具体例をあげて説明した．Interactions between excited molecules will prevail in organic crystals or aggregates, provided that the absorption coefficient of the component molecule is high and they are arranged periodically. This phenomenon is called excitonic interactions (i.e. interactions between transition dipoles) observed often in dyestuffs and pigments that induces spectral shifts or band splitting (Davydov splitting). The present paper describes an overview of the exciton theory and presents some examples which include J-aggregates of cyanine dyestuffs.
2007-10-25