Formation of supramolecular complexes of tris(6,6′-oligoethyleneglycol-3,3′-bipyridazine)ruthenium(II) dichloride with alkali and alkaline earth metal ions

Abstract

The new tris(6,6'-oligoethyleneglycol-3,3'-bipyridazine)Ru~~-dich~orides 1,2 form binuclear metal complexes with alkali and alkaline earth ions w i t h high selectivity and these complexes show increased fluorescence quantum yields and lifetimes.

Signaling Recognition Events with Fluorescent Sensors and Switches

“…While 65 is devoid of any crown ether receptors, it does possess an array of poly(oxyethylene) chains which can organize around a guest cation, e.g., Ca 2+ …”

“…The MLCT excited state of tris(6,6‘-alkoxy-3,3‘-bipyridazine)ruthenium(II) is thus perturbed to result in small increases of the luminescence quantum yield and lifetime. It is conceivable that the presence of the guest dication close to the ligand π-electron system can preferentially stabilize the MLCT state relative to the nonemissive MC excited state 295a …”

Metal Ion Sensors Based on a Luminescent Ruthenium(II) Complex: The Role of Polymer Support in Sensing Properties

“…4,5 M etal ion sensors are commonly designed with metal ion sensitivity controlled through a metal ion binding substituent on one of the ligands. Examples of this include several [Ru(bpy) x ] (bpy 5 2,2 9-bipyridine) based complexes sensitive to binding with both cations such as H 1 , 6,7 Na 1 , [8][9][10][11] or Ca 1 , 12 and anions such as Cl 2 and H 2 PO 4 2 ions. [13][14][15][16][17] The metal com plex used here as the sensor was Ru(Ph 2 phen) 2 (4-cyclamCH 2 (4 9-Me)bpy) 21…”

Photoaktivierungsfähige Rhodamine als Bio-Calcium-Sensoren und Markierungen für Tetracystein-Tags in Proteinen

“…A ruthenium complex which is sensitive to the presence of calcium. [83] Compound 25 was one of the first podand calcium indicators. It represents a highly watersoluble ruthenium complex.…”

“…It represents a highly watersoluble ruthenium complex. [83] Initially, it was created not as a sensor and, therefore, the sensitivity for calcium was poorly investigated. The complex 25 showed a satisfactory increase in fluorescence intensity (1.3 times) upon calcium saturation (at 0.65 mM).…”