Aggregation, adsorption, counterion binding, thermal and scattering behavior of metallosurfactant cis-[Co(en)2(C12H25NH2)Cl](NO3)2

Aggregation and adsorption behavior of cobalt‐based metallosurfactant in water–ethylene glycol media forming worm‐like micelles

“…The surface excess value that we obtained for CHCC in water at 298.15 K is 2.64 × 10 −6 mol m −2 and the corresponding value of A min is 0.63 nm 2 . The Γ cmc and A min values of CHCC metallosurfactant in WR at 298.15 K are nearly similar to those reported (2.59 × 10 −6 mol m −2 and 0.64 nm 2 , respectively) for cis‐chlorobis(ethylenediamine)dodecylaminecobalt(III) nitrate (Wagay et al, 2016a). With increase in weight percentage of EG in the bulk, the adsorption of CHCC metallosurfactant at the air‐solution interface decreases.…”

“…Metallosurfactants are a fascinating class of amphiphilic compounds that besides aggregation and adsorption behavior own a variety of other interesting characteristic features like color, sensitivity to pH, magnetic, oxidation-reduction, and catalytic behavior due to the presence of transition or inner-transition metals (Griffiths et al, 2006;Griffiths et al, 2008). These surfactants manifest better physicochemical characteristics, that is, lower critical micelle concentrations (cmc), high head-group form/structure dependence, greater solubilization power, and surprising aggregate/micellar structures in comparison to conventional surface active agents having the same lengths of carbon chains (Garcia et al, 2007;Garg et al, 2018;Myers, 2005;Wagay et al, 2016a;Wagay et al, 2020;Wagay & Ismail, 2017). Currently, a very large interest has been sparked in search of new and better metallosurfactants due to their extremely impressive relevance in different fields.…”

Quantitative Analysis of the Interactions of Metal Complexes and Amphiphilic Systems: Calorimetric, Spectroscopic and Theoretical Aspects

“…Sometimes, one of the species may emit light and a fluorescence signal may be recorded. Note that metal ions may be also directly coordinated to the surfactant head, leading to the so-called metallo-surfactants (or metal surfactant complexes), which are a recent alternative to conventional surfactants possessing unique properties, opening the door to different applications [67,68]; however, these topics are out of the focus of the present section devoted to metal-ligand equilibria in amphiphilic media. The binding curve obtained for the sodium oleate/iron oxide system was analyzed by using Freundlich, Langmuir and Langmuir-Freundlich isotherms, and the latter displaying the best fit due to the combination of the non-homogenous adsorption features of the Freundlich with the finite monolayer adsorption of the Langmuir equation.…”

“…Sometimes, one of the species may emit light and a fluorescence signal may be recorded. Note that metal ions may be also directly coordinated to the surfactant head, leading to the so-called metallo-surfactants (or metal surfactant complexes), which are a recent alternative to conventional surfactants possessing unique properties, opening the door to different applications [67,68]; however, these topics are out of the focus of the present section devoted to metal-ligand equilibria in amphiphilic media.…”