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Synthesis and Characterization of a Novel Tantalum Chalcogen-Rich Molecular Cluster with Square Planar Metal Core

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posted on 13.12.2004, 00:00 by Maxim N. Sokolov, Artyom L. Gushchin, Alexandr V. Virovets, Eugenia V. Peresypkina, Svetlana G. Kozlova, Vladimir P. Fedin
Black single crystals of Ta4Se9I8 are obtained in a high yield by heating Ta, Se, and I2 at 300 °C in 1:2.2:1.0 molar ratio. In the structure, the tantalum atoms form a square, with four Se2 ligands bridging the Ta−Ta edges and one capping the square. Each Ta atom has two terminal iodine atoms. The compound is diamagnetic and has only two electrons for metal−metal bonding.