Preparation of Iron-Sulfur Cubane Nanoclusters and Their Immobilization on Functionalized Carbon Nanotubes.

Author(s) Sheikh, A.Hassan; Bose, M.; Sarkar, S.; Begum, A.
Journal J Nanosci Nanotechnol
Date Published 2019 May 01
Abstract

With large surface area and versatile electronic behaviour, the composites of Fe₄S₄(SRS)₄ nanoclusters and functionalized carbon nanotubes (f-CNTs), are expected to catalyze the conversion of protons to hydrogen gas at lower electro-potentials with higher output than a platinum electrode. In search of a non-noble metal based catalytic material, we report for the first time, the isolation of unimolecular iron-sulfur cubane cluster, [Fe₄(-S)₄(mnt)₄], () (mnt = maleonitriledithiolate) as nanocubes (63×85×120 nm) in MeCN-EtOH (MeCN is acetonitrile, while EtOH is ethanol) solvents and bimolecular [NBu₄]₄[Fe₄(-S)₄(mnt)₄] as nanocuboctahedra (120×121×125 nm) in pure EtOH. The cubic shape of the nanocrystal reminds its geometrical relationship with a molecular cube and one of sides of the nanocube and nanocuboctahedron matches at 120 nm. The nanocubes of Fe₄S₄(SRS)₄ have been immobilized on f-CNTs and characterized by SEM and TEM methods which indicate that clusters of Fe₄S₄ of diameter (8-9 nm) interact with surfaces, sidewalls and tip of the f-CNTs. A ferrocene type of interaction could not be observed with f-CNTs, because nanoparticles are not found in CNT-inner cavity. The interaction could be either adsorption or hydrogen bonding interactions between -COOH/-OH groups of f-CNTs and N≡C terminals of iron-sulphur nanoclusters leading to immobilization of an iron-sulfur nanocluster on a single CNT molecule or the iron-sulfur nanoclusters can be entrapped between two CNT molecules.

DOI 10.1166/jnn.2019.16024
ISSN 1533-4880
Citation Sheikh AH, Bose M, Sarkar S, Begum A. Preparation of Iron-Sulfur Cubane Nanoclusters and Their Immobilization on Functionalized Carbon Nanotubes. J Nanosci Nanotechnol. 2019;19(5):2895-2902.

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