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Homoleptic and Heteroleptic Ruthenium(II) Complexes Based on 2,6‐Bis(quinolin‐2‐yl)pyridine Ligands – Multiple‐Charged‐State Modules for Potential Density Memory Storage
Author(s) -
Marin Ion,
Turta Constantin,
Benniston Andrew C.,
Harrington Ross W.,
Clegg William
Publication year - 2015
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.201403088
Subject(s) - homoleptic , chemistry , ruthenium , pyridine , electrochemistry , redox , ligand (biochemistry) , carboxylate , photochemistry , medicinal chemistry , inorganic chemistry , stereochemistry , metal , catalysis , organic chemistry , biochemistry , receptor , electrode
The two ligands 2,6‐bis(4‐methylquinolin‐2‐yl)pyridine ( L 1 ) and diethyl 2,2′‐(pyridine‐2,6‐diyl)bis(quinolone‐4‐carboxylate) ( L 2 ) were used to prepare the homoleptic [Ru( L 2 ) 2 ][PF 6 ] 2 (RU 1 ) and heteroleptic [Ru( L 1 )( L 2 )][PF 6 ] 2 (RU 2 ) complexes. DFT calculations (B3PW91,3‐21G**) performed on both RU 1 and RU 2 revealed that redox at the ruthenium site for RU 2 is less positive by ca. 110 mV. Consequently, the one‐electron ligand‐based reduction for RU 2 is more cathodic by 80 mV. Electrochemistry experiments confirmed that the prediction is qualitatively correct and that the complexes can each hold up to five electrons reversibly.