The co-crystal 4,6-di-acetyl-resorcinol-1-amino-pyrene (2/1).

The structure of the title mol-ecular complex, CHN·2CHO, at 150 K has been determined. The mol-ecules form stacks consisting of aggregates with disordered 1-amino-pyrene mol-ecule surrounded by two 4,6-di-acetyl-resorcinol mol-ecules. Neighbouring stacks are linked by hydrogen bonds between the amine H atoms of the 1-amino-pyrene mol-ecule with the adjacent carbonyl oxygen atom of the 4,6-di-acetyl-resorcinol mol-ecule.

Sennoside A drug capped biogenic fabrication of silver nanoparticles and their antibacterial and antifungal activities.

Sennoside A (dianthrone glycoside) shows laxative properties and used as a folk traditional medicine. Sennoside A capped silver nanoparticles (Ag/sennoside A) were synthesized at room temperature for the first time by using sennoside A as reducing and capping agent. UV-visible spectroscopic data reveals that the absorption peaks of pure sennoside A was appeared at 266, and 340 nm, which red shifted to 304, and 354 nm at higher sennoside A concentration.

Eco-friendly green synthesis of Ag@Fe bimetallic nanoparticles: Antioxidant, antimicrobial and photocatalytic degradation of bromothymol blue.

Silver-iron bimetallic nanoparticles (BMNPs) were synthesized by using AgNO and Fe(NO) as an Ag/Fe source in presence of Palm dates fruit. Upon addition of extract to a solution of Ag and Fe, a prefect transparent stable dark brown color appears with in a few minuets at room temperature. In order to conform the nature of resulting color, UV-visible spectroscopy, transmission electron microscopy (TEM) and energy dispersive X-ray spectroscopy (EDX) techniques were used.

Seedless synthesis of nanocomposites, optical properties, and effects of additives on their surface resonance plasmon bands.

The work describes an easy seedless competitive chemical reduction method for the synthesis of Ag@Au/Ag bimetallic nanoparticles by mixing AgNO, HAuCl and cysteine. Transmission electron microscope (TEM) images show that the large number of irregular, cross-linking, and aggregated Ag@Au/Ag are formed in a reaction mixture (HAuCl+AgNO+cysteine), whereas flower-like nanocomposites are obtained in presence of cetyltrimethylammonium bromide (CTAB), which acted as a shape-directing agent. Optical images reveal that the initially reaction proceeds through formation of purple color, which changes into dark brown color with the reaction time, indicating the formation of Ag@Au/Ag nanocomposites.

Aggregation of Congo red with surfactants and Ag-nanoparticles in an aqueous solution.

Self aggregation, sorption, and interaction of Congo red, with cetyltrimethylammonium bromide (CTAB), sodium dodecylsulfate (SDS), Ag(+) ions and silver nanoparticles have been determined spectrophotometrically. Congo red self-aggregation was identified from UV-visible spectra due to the shrinkage in an absorption band at 495 nm. The shape of the absorbance spectrum changed entirely with increasing [Congo red] but wavelength maxima remain unchanged.