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Ein Licht emittierender Imidazol‐substituierter 2,2'‐Bipyridin‐Ruthenium(II)‐Komplex als Sensorfür die Reaktion von Protonen und Metallionen am peripheren Imidazolring
Author(s) -
Schramm Frank,
Görls Helmar,
Walther Dirk
Publication year - 2006
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.200500383
Subject(s) - deprotonation , imidazole , ruthenium , chemistry , protonation , molecule , ring (chemistry) , ligand (biochemistry) , medicinal chemistry , crystallography , stereochemistry , photochemistry , ion , catalysis , organic chemistry , biochemistry , receptor
A Light Emitting Imidazole Substituted 2,2'‐Bipyridin Ruthenium(II) Complex as a Sensor for Reactions of Protons and Metal ions on the Peripheral Imidazole Ring Ruthenium(II) complexes of the type [(tbbpy) 2 Ru(L‐L)](PF 6 ) 2 (tbbpy = bis‐4,4'‐di‐tert‐butyl‐2,2'‐bipyridine; 1 : L‐L = 5‐(N‐ethoxymethyl‐1H‐imidazol‐2‐yl)‐[2,2']bipyridine; 2 : L‐L = 1H‐imidazol‐2‐yl)‐[2,2']bipyridine) were prepared from [(tbbpy) 2 RuCl 2 ] and the chelate ligands L‐L followed by treatment with NH 4 [PF 6 ]. Characterization occurred by ESI‐MS, 1 H‐ und 13 C NMR spectroscopy. The molecular structure of 2 , crystallized with five water molecules, was determined by an X‐ray diffraction analysis. The ruthenium(II) ion is surrounded distorted octahedral by the six N‐donor ligand atoms of the chelate ligands and two complex molecules are connected via the water molecules which form a hydrogen bonded network with the two nitrogen atoms of the peripheral imidazole ring. The water‐free complex 2 in THF emits light at room temperature. Both, the deprotonation and the protonation of the peripheral imidazole ring results in systems which show extremely weak emission intensity only. Also, the interaction of 2 with water decreases the intensity of the emission. The coordination of metal ions at the imidazole ring of 2 or at the imidazolate ring of the deprotonated species 2a is indicated by an increase of the emission intensity and the change of the emission maxima.