Cationic surfactants based on ferrocene containing thiourea: Synthesis, self-aggregation, and antioxidant properties

Crystal structure and Hirshfeld surface analysis study of (E)-1-(4-chloro-phen-yl)-N-(4-ferrocenylphen-yl)methanimine

The substituted cyclo-penta-dienyl ring in the title mol-ecule, [Fe(C5H5)(C18H13ClN)], is nearly coplanar with the phenyl-1-(4-chloro-phen-yl)methanimine substituent, with dihedral angles between the planes of the phenyl-ene ring and the Cp and 4-(chloro-phen-yl)methanimine units of 7.87 (19) and 9.23 (10)°, respectively. The unsubstituted cyclo-penta-dienyl ring is rotationally disordered, the occupancy ratio for the two orientations refined to a 0.666 (7)/0.334 (7) ratio. In the crystal, the mol-ecules pack in 'bilayers' parallel to the ab plane with the ferrocenyl groups on the outer faces and the substituents directed towards the regions between them. The ferrocenyl groups are linked by C-H⋯π(ring) inter-actions. A Hirshfeld surface analysis of the crystal structure indicates that the most important contributions for the crystal packing are from H⋯H (46.1%), H⋯C/C⋯ H (35.4%) and H⋯Cl/Cl⋯H (13.8%) inter-actions. Thus C-H⋯π(ring) and van der Waals inter-actions are the dominant inter-actions in the crystal packing.

Mass and charge transport in highly mesostructured polyelectrolyte/electroactive-surfactant multilayer films

HYPOTHESIS

Dimensionally stable electroactive films displaying spatially addressed redox sites is still a challenging goal due to gel-like structure. Polyelectrolyte and surfactants can yield highly mesostructured films using simple buildup strategies as layer-by-layer. The use of redox modified surfactants is expected to introduce order and an electroactive response in thin films.

EXPERIMENTS

The assembly of polyacrylic acid and different combinations of redox-modified and unmodified hexadecyltrimethylammonium bromide yields highly structured and electroactive thin films. The growth, viscoelastic properties, mass, and electron transport of these films were studied by combining electrochemical and quartz crystal balance with dissipation experiments.

FINDINGS

Our results show that the films are highly rigid and poorly hydrated. The mass and charge transport reveal that the ingress (egress) of the counter ions during the electrochemical oxidation (reduction) is accompanied with a small amount of water, which is close to their hydration sphere. Thus, the generated mesostructured films present an efficient charge transport with negligible changes in their structures during the electron transfer process. The control over the meso-organization and its stability represents a promising tool in the construction of devices where the vectorial transfer of electrons, or ions, is required.

Assessing the biological potential of new symmetrical ferrocene based bisthiourea analogues

In the present work synthesis and characterization of five new bisferrocenyl bisthiourea analogues (G_2M, S_2M, G_3F, G_4F and T_2M) is reported. UV-Visible and electrochemical studies were performed in order to have optical (absorption maximum, Molar absorption coefficient and optical band gap) and electrochemical parameters (Oxidation/reduction potentials and nature of the electrochemical process) of the compounds. In vitro various biological studies such as antibacterial, antifungal, anti-oxidant and antidiabetic activities were carried out to have comparative overview of the phermacochemical strength of the newly synthesized compounds. Similarly, theoretical analysis was accomplished utilizing density functional theory calculations. DFT/B3LYP (6-31G d, p) technique was used. With a view to explore the structure activity relationship (SAR) of the compounds theoretical docking analysis (against α-amylase, α-glucosidase) was also performed to have pictorial view and understanding of the actual interactions responsible for the activity. S_2M displayed best antibacterial activity. Similarly, Antifungal and antidiabetic activities showed G_3F as a best candidate, whereas T_2M proved to be the best antioxidant agent.