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Nikolaev Institute of Inorganic Chemistry

Siberian Branch of Russian Academy of Sciences

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30 марта 2015 года →  Hot articles

Synthesis, Crystal Structure, and Colloidal Dispersions of Vanadium Tetrasulfide

The article of NIIC researches Kozlova, M. N., Mironov, Yu. V., Grayfer, E. D., Smolentsev, A. I., Podlipskaya, T. Yu., Fedorov, V. E. is published in Chemistry – A European Journal (IF 5.696):

Kozlova, M. N., Mironov, Y. V., Grayfer, E. D., Smolentsev, A. I., Zaikovskii, V. I., Nebogatikova, N. A., Podlipskaya, T. Y., Fedorov, V. E. «Synthesis, Crystal Structure, and Colloidal Dispersions of Vanadium Tetrasulfide (VS4 Chem. Eur. J. 2015, 21, №12, P. 4639–4645 DOI: 10.1002/chem.201406428

Although many of the layered metal chalcogenides, such as MoS2, are well-studied, some other chalcogenides have received less attention by comparison. In particular, there has been an emerging interest in vanadium tetrasulfide (VS4), which displays useful properties as a component of hybrids. However, the synthetic methods and characteristics of individual VS4 are not yet well defined, and there is no report on its solution processability. Here we have synthesized VS4 by a simple and fast direct reaction between elements. Reinvestigation of the VS4 crystal structure yielded more precise atomic coordinates and interatomic distances, thereby confirming the crystallization of VS4 in the monoclinic C2/c group and its quasi-1D chainlike structure. As the chains in VS4 are only bonded by weak van der Waals forces, we further demonstrate that bulk VS4 may be ultrasonically dispersed in appropriate solvents to form colloids, similarly to the layered chalcogenides. VS4 particles in colloids retain their phase identity and rod-shaped morphology with lengths in the range of hundreds of nanometers. Isopropanol dispersion exhibited the highest concentration and stability, which was achieved owing to the repulsion caused by high negative charges on the edges of the particles.

Quasi-1D chain structure of VS4 and the scheme for VS4 dispersion in solvents showing SEM and TEM images of VS4 rods before (left) and after sonication (right). The vial contains VS4/isopropanol dispersion and shows Tyndall effect from a laser pointer.

Quasi-1D chain structure of VS4 and the scheme for VS4 dispersion in solvents showing SEM and TEM images of VS4 rods before (left) and after sonication (right). The vial contains VS4/isopropanol dispersion and shows Tyndall effect from a laser pointer.

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