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π‐Stacking Modulates the Luminescence of [(dppz)Ni(Mes)Br] (dppz = dipyrido[3,2‐ a :2′,3′‐ c ]phenazine, Mes = 2,4,6‐trimethylphenyl)
Author(s) -
Klein Axel,
Hurkes Natascha,
Kaiser André,
Wielandt Wolfram
Publication year - 2007
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.200700082
Subject(s) - phenazine , luminescence , stacking , excited state , chemistry , crystallography , photochemistry , crystal (programming language) , crystal structure , stereochemistry , materials science , physics , optoelectronics , atomic physics , organic chemistry , computer science , programming language
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.