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Elucidating the Origin of Enhanced Phosphorescence Emission in the Solid State (EPESS) in Cyclometallated Iridium Complexes
Author(s) -
Howarth Ashlee J.,
Patia Raissa,
Davies David L.,
Lelj Francesco,
Wolf Michael O.,
Singh Kuldip
Publication year - 2014
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201402495
Subject(s) - phosphorescence , iridium , chemistry , ligand (biochemistry) , excited state , photochemistry , stacking , ring (chemistry) , solid state , chelation , triplet state , crystallography , molecule , fluorescence , inorganic chemistry , catalysis , organic chemistry , biochemistry , physics , receptor , quantum mechanics , nuclear physics
A new mechanism for enhanced phosphorescence emission in the solid state (EPESS) in cyclometallated Ir complexes with the general formula [Ir(CN) 2 (NO)] involving distortion of the six‐membered chelate ring of the ancillary ligand is proposed. Photophysical and computational studies show that neither π‐stacking nor restricted rotation cause the observed EPESS in these complexes and that ligand distortions in the triplet excited state are responsible for EPESS