Synthesis of new binary porphyrin–cyanine conjugates and their self-aggregation in organic-aqueous media

2018 ◽  
Vol 28 (6) ◽  
pp. 626-628 ◽  
Author(s):  
Kseniya A. Zhdanova ◽  
Artem V. Ezhov ◽  
Natal’ya A. Bragina ◽  
Andrey F. Mironov
Keyword(s):  
Aqueous Media ◽  
Self Aggregation

Kinetic and spectroscopic studies on the chiral self-aggregation of amphiphilic zinc and copper (l)-prolinate-tetraarylporphyrin derivatives in different aqueous media

2019 ◽  
Vol 17 (5) ◽  
pp. 1113-1120 ◽  
Author(s):  
Fabrizio Caroleo ◽  
Manuela Stefanelli ◽  
Gabriele Magna ◽  
Mariano Venanzi ◽  
Roberto Paolesse ◽  
...  
Keyword(s):  
Metal Ion ◽  
Aqueous Media ◽  
Spectroscopic Studies ◽  
Porphyrin Derivatives ◽  
The Media ◽  
Self Aggregation

The chiral self-aggregation of (l)-proline porphyrin derivatives depends on both the nature of the media and the coordinated metal ion.

Study on the Effect of an Electrolyte on the Self-Aggregation and the Geometry of the Dye Aggregates of Methylene Blue in Aqueous Media

2016 ◽  
Vol 32 (1-2) ◽  
pp. 27
Author(s):  
Ng. Florence ◽  
H. Naorem
Keyword(s):  
Methylene Blue ◽  
Twist Angle ◽  
Aqueous Media ◽  
Least Square ◽  
The Self ◽  
Aggregation Process ◽  
Dimerization Constant ◽  
Sandwich Type ◽  
Linear Least Square ◽  
Self Aggregation

The self-aggregation of Methylene Blue (MB) dye in aqueous media has been investigated spectrophotometrically in presence of sodium chloride (NaCl) at 293.15, 303.15 and 313.15K. The dimerization constant (K<sub>D</sub>) of the MB dye in aqueous solution with or without the electrolyte has been computed using a non-linear least square regression technique. It is observed that presence of the electrolyte resulted into sharp increase in K<sub>D</sub> of MB indicating that presence of the electrolyte favours formation of dye aggregates. There is, however, a decrease in K<sub>D</sub> with increase in temperature. From the observed spectra of the dye, the twist (θ<sub>1</sub>) and the tilt (θ<sub>2</sub>) angles between the dipoles of MB molecules in the aggregates have been computed based on exciton model. Change in the monomeric fractions of the dye (α) in presence of the added electrolyte as a function of the dye concentration has also been computed. The results indicated that the dye aggregates formed is essentially of the sandwich type geometry (H-aggregates) with a slight deviation from an exact parallel stacking arrangement and reduced twist angle. The thermodynamic parameters of the aggregation process in presence of the electrolyte have been evaluated from the temperature dependence of K<sub>D</sub>. It is observed that the aggregation process is an enthalpy rather than entropy controlled one.

Original disymmetric bolaforms bearing at least one sulfobetaine head; synthesis and surface properties

2001 ◽  
Vol 79 (7) ◽  
pp. 1153-1158 ◽  
Author(s):  
Souad Souirti ◽  
Michel Baboulène
Keyword(s):  
Surface Properties ◽  
Functional Groups ◽  
Efficient Method ◽  
Aqueous Media ◽  
Critical Micellar Concentration ◽  
Excellent Yield ◽  
Wide Range ◽  
Self Aggregation ◽  
Cationic Amphiphile

We describe a simple and efficient method for the synthesis of disymmetric bolaforms bearing at least one sulfobetaine head. In this process, we could introduce successively on α, ω-bis(dialkylamino) alkane a sulfobetaine head and a cationic, a sulfobetaine, or a carboxybetaine head, in excellent yield. This is the first synthesis of disymmetric sulfobetaine bolaforms. The method is easily generalized to various types of head functional groups. The wide range of bolaforms produced by this method has been exploited to study their surface properties and to determine the respective roles of the polar heads and the lengths of the spacers (n) on self-aggregation in aqueous media. A critical micellar concentration (cmc) was observed with the compounds with a spacer of 12 carbon atoms (n = 12). Micellization appeared to be consistent with a "wicket-like" conformation, which did not appear to form with the n = 8 compounds.Key words: disymmetric bolaform, sulfobetaine, carboxybetaine, cationic amphiphile, synthesis, surface properties.

Hybrid surfactants decorated with copper ions: aggregation behavior, antimicrobial activity and anti-proliferative effect

2016 ◽  
Vol 18 (34) ◽  
pp. 23961-23970 ◽  
Author(s):  
Gurpreet Kaur ◽  
Sandeep Kumar ◽  
Neeraj Dilbaghi ◽  
Gaurav Bhanjana ◽  
Santosh Kumar Guru ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Biological Activity ◽  
Copper Ions ◽  
Aqueous Media ◽  
Aggregation Behavior ◽  
The Self ◽  
Proliferative Effect ◽  
Self Aggregation

In the present study, the emphasis is laid on the self aggregation behavior and biological activity of copper based inorganic–organic hybrids in aqueous media.

Nanoscale Kolliphor ® HS 15 micelles to minimize rifampicin self-aggregation in aqueous media

2017 ◽  
Vol 41 ◽  
pp. 1-6 ◽  
Author(s):  
Estefanía Grotz ◽  
Ezequiel Bernabeu ◽  
Monica Pappalardo ◽  
Diego A. Chiappetta ◽  
Marcela A. Moretton
Keyword(s):  
Aqueous Media ◽  
Self Aggregation
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