Synthesis, structure and characterization of Fe₆molecular clusters with peripheral sulfur atom-capped silver nanoparticles

Abstract

There are rare reports of high-nuclear transition metal clusters with thiol groups in their periphery. In this work, a novel cluster, [Fe 6 O 2 (OH) 2 (O 2 CC 6 H 4 SCH 3 ) 10 (hep) 2 ]•CH 3 CN•CH 2 Cl 2 (Fe 6 ) has been constructed by coordinating an octahedral Fe(III) ion with 4-mercaptobenzoate and hepH (hepH = 2-(2-hydroxyethyl) pyridine). The functionalized thiomethyl groups around the periphery of the Fe 6 cluster may provide binding sites for the surfaces of some specific materials, such as noble metals. Therefore, silver nanoparticle coated Fe 6 (Ag@Fe 6 ) complexes have been prepared by spontaneous self-assembly reactions.Transmission electron microscopy (TEM) and high resolution transmission electron microscopy (HRTEM) images show that the Fe 6 cluster layer is formed on the surface of the silver nanoparticles and the diameter of the Fe 6 cluster is about 2 nm. In addition, powder X-ray diffraction (XRD), UV-vis spectroscopy, surface enhanced Raman spectroscopy (SERS), and cyclic voltammetry of the Fe 6 and Ag@Fe 6 complexes were also investigated.

Stabilization of antimicrobial silver nanoparticles by a polyhydroxyalkanoate obtained from mixed bacterial culture

“…These results are in agreement with the Standard Powder Diffraction card of Joint Committee on Powder Diffraction Standard (JCPDS), silver file No. 04-783 (a = 4.086Å) and in line with previous experimental reports [38,39]. For instance, Theivasanthi and Alagar reported similar crystalline structures using silver nanopowder made by electrolytic synthesis [40].…”

Detection of dopamine on a mercapto-terminated hexanuclear Fe(III) cluster modified gold electrode

“…In [10]. The unique structure of the Fe6 complex allows incorporation of 10 -SCH 3 groups creating the periphery of the cluster.…”

“…In this regard, introducing thiol groups into the periphery of such complex using functionalized ligand may be a feasible approach [9,10]. Molecules containing -SH or -SCH 3 can be immobilized on the surface of metallic electrodes through self-assembly (via formation of covalent bonds between metal and sulfur atoms).…”

Coordination chemistry of 3- and 4-mercaptobenzoate ligands: Versatile hydrogen-bonding isomers of the thiosalicylate (2-mercaptobenzoate) ligand

“…33a which shows one of the carboxylate groups is coordinated in a bidentate chelating mode, another in a monodentate mode and two other positions in the equatorial plane of the uranyl group is completed by carboxylate-oxygen atoms derived from two bridging ligands, leading to a pentagonal bipyramidal geometry. [22] The bridging 4MBA disulphide ligands and uranyl groups form a two-dimensional net with topology 4 13 6 2 , as illustrated in Fig. 33b.…”

“…Ph3SnOC(O)C6H4SH-4; analysis of this complex by 13 C and 119 Sn NMR spectroscopies was used to provide evidence that the complex exists in a monomeric form in solution. [25] The bis(triphenyltin) derivative of 3MBA, [Ph3SnOC(O)C6H4SSnPh3-3], has also been prepared by reaction of H23MBA with Ph3SnCl and NaOEt in benzene.…”