Premium
Synthesis and Optical Properties of Phenanthroline‐Derived Schiff Base‐Like Dinuclear Ru II –Ni II Complexes
Author(s) -
Kurz Hannah,
Lochenie Charles,
Wagner Kristina G.,
Schneider Sandra,
Karg Matthias,
Weber Birgit
Publication year - 2018
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201704632
Subject(s) - phenanthroline , nickel , ruthenium , phosphorescence , photochemistry , chemistry , photoluminescence , schiff base , acceptor , bimetallic strip , pyridine , quenching (fluorescence) , crystallography , materials science , fluorescence , medicinal chemistry , catalysis , organic chemistry , physics , optoelectronics , quantum mechanics , condensed matter physics
Two phenanthroline‐derived Schiff base‐like ligands with a covalently linked ruthenium(II) phosphorescent unit were synthesised and converted into bimetallic Ru II –Ni II complexes. The optical properties were studied to examine a possible photoluminescence quenching through a nonradiative energy‐transfer upon a coordination‐induced spin‐state switch (CISSS) at the nickel(II) centre. Therefore, the metalloligands and the nickel(II) complexes were studied using UV/Vis absorbance, steady‐state, and time‐resolved emission spectroscopy in solutions of MeCN and pyridine. It is demonstrated that the nature of the bridging ligand between the ruthenium(II) donor and the nickel(II) acceptor strongly influences the photophysical behaviour upon CISSS. For the complex with a phenazine bridge, photoluminescence quenching is observed in the presence of a paramagnetic nickel(II) centre.