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Bis‐Cyclometallated Iridium(III) Complexes with Bidentate Ligands Containing One or Two Pyridylideneamine (PYE) Donors: Influence of PYE Substitution ( para or ortho ) on Complexation
Author(s) -
Abdolla Noreldin S. Y.,
Davies David L.,
Singh Kuldip
Publication year - 2021
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.202001054
Subject(s) - chemistry , iridium , denticity , substitution (logic) , medicinal chemistry , stereochemistry , crystallography , organic chemistry , catalysis , crystal structure , computer science , programming language
Six pyridylideneamine (PYE)‐containing bidentate ligands and their bis‐cyclometallated Ir(III) complexes have been synthesised and fully characterised. The PYE groups show a contribution from a neutral imine resonance form and a zwitterionic pyridinium form. NMR spectroscopy of the para‐ substituted ligands and complexes show those with a C 6 H 4 bridging group have the fastest PYE rotation. X‐ray crystallography of p ‐1 and p ‐3 shows the PYE N‐donor is trigonal planar whereas for the ortho ‐complexes it is more pyramidalized implying an increased contribution of the zwitterionic resonance form for the ortho ‐complexes.