π‐Stacking Modulates the Luminescence of [(dppz)Ni(Mes)Br] (dppz = dipyrido[3,2‐<i>a</i>:2′,3′‐<i>c</i>]phenazine, Mes = 2,4,6‐trimethylphenyl)

2007/07/30 by Axel Klein, Natascha Hurkes, André Kaiser +1
Chemistry · Medicine · Materials Science · #Organometallic Complex Synthesis and Catalysis #Metal complexes synthesis and properties #Magnetism in coordination complexes

paper · doi:10.1002/zaac.200700082

Abstract

Abstract The red colour of the novel organonickel complex [(dppz)Ni(Mes)Br] (dppz = dipyrido[3,2‐ a :2′,3′‐ c ]phenazine, Mes = 2,4,6‐trimethylphenyl) originates from long‐wavelength MLCT/L′LCT charge transfer bands. However, luminescence in dilute solution comes presumably from the 3 π‐π* (phenazine) excited state. The red‐shifted emission exhibited in concentrated solutions is assigned to dimers. In the solid state emission is quenched. The crystal structure reveals two different types of π‐π stacking along the crystallographic a axis.

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