Photophysical properties of amphiphilic ruthenium(ii) complexes in micelles

Abstract

Amphiphilic ruthenium(II) complexes II–IV were synthesized and their photophysical properties were investigated in the presence of anionic (SDS), cationic (CTAB) and neutral (Triton X-100) micelles. The absorption and emission spectral data in the presence of micelles show that these Ru(II) complexes are incorporated in the micelles. There are two types of interaction between complexes I–IV and the micelles: hydrophobic and electrostatic. In the case of cationic micelles (CTAB), the hydrophobic interactions are predominant over electrostatic repulsion for the binding of cationic complexes II–IV with CTAB. In the case of anionic micelles (SDS), electrostatic interactions seem to be important in the binding of II–IV to SDS. Hydrophobic interactions play a dominant role in the binding of II–IV to the neutral micelles, Triton X-100. Based on the steady state and luminescence experiments, the enhancement of luminescence intensity and lifetime in the presence of micelles is due to the protection of the complexes from exposure to water in this environment.

Photoinduced Electron Transfer Reactions of Ruthenium(II) Phenanthroline Complexes with Dimethylaniline in Aqueous and Micellar Media

“…The strength of binding depends on the combination of electrostatic attractions or repulsions and hydrophobic effects [17][18][19][20][21][22]. Davies et al studied the effects of micellar solution on the electron transfer reaction between [Co(terpyr)] 2+ and a series of Co(III)-complexes in varying ligand structure and ionic charge redox reactions of amphiphilic cobalt complexes [23].…”

Electron Transfer Reactions of Photochemically Generated Ruthenium(III)–Polypyridyl Complexes with Methionines

“…(12) is 0.73 eV for methionine, 0.70 eV for ethionine, 0.61 eV for buthionine, and 0.69 eV for N-acetylmethionine. The value of λ i is found to be 0.2 eV and is employed in the calculation of the rate constant for the ET reaction [68][69][70]. Thus the total reorganization energy λ value for this redox system is in the range of 0.81-0.93 eV.…”

Cu(II)–Schiff base complex‐functionalized magnetic Fe3O4 nanoparticles: a heterogeneous catalyst for various oxidation reactions

“…Selective oxidation of sulfides to sulfoxides and sulfones under adjusted reaction conditions is an important process in the decontamination of sulfur mustard (a chemical warfare agent) and in the production of organosulfurous compounds of medicinal importance . The oxidation reaction of organic sulfides is also of potential use in the decontamination of toxic chemicals and facile electron transfer reactions . Metal–salen complexes (metal = Mn, Cr, Fe, Ru, Co, V and Ti) have been used extensively as efficient homogeneous catalysts for the selective oxidation of organic sulfides and sulfoxides …”

“…[19] The oxidation reaction of organic sulfides is also of potential use in the decontamination of toxic chemicals and facile electron transfer reactions. [20,21] Metal-salen complexes (metal = Mn, Cr, Fe, Ru, Co, V and Ti) have been used extensively as efficient homogeneous catalysts for the selective oxidation of organic sulfides and sulfoxides. [22][23][24][25][26][27][28] Disulfides play interesting roles in both biological (DNA cleavage properties and stabilization of peptides in proteins) and chemical [29] (protecting groups, vulcanizing agents, and oils for rubber and elastomers) processes.…”