Abstract
Abstract Dipyrrinone chromophores, attached by their acid termini to give (1 R ,2 R )-cyclohexanediol dipropionate and diacetate esters (xanthobilirubinate and nor-xanthobilirubinate, respectively), interact through exciton coupling, as evidenced by intense bisignate circular dichroism Cotton effects for the pigment's long wavelength transition. The bis-xanthobilirubinate exhibits the expected negative exciton chirality (Δϵ max 439 -16, Δϵ max 382 +22, CH 2 Cl 2 ) but the bis-norxanthobilirubinate exhibits positive exciton chirality (Δϵ max 420 +38, Δϵ max 367 -46, CH 2 Cl 2 ).
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