2005
Tantalum
I 5200
08- 018
Synthesis and Characterization of a Novel Tantalum Chalcogen-Rich Molecular
Cluster with Square Planar Metal Core. — Black single crystals of the new compound Ta4Se 9I8 are obtained in 87% yield by reaction of Ta, Se, and I2 (1:2.2:1 molar
ratio, 300 °C, evacuated glass tube, 3 d). Ta4Se9I8 crystallizes in the orthorhombic space
group Pna21 with Z = 4. The Ta atoms form a square with four Se2 ligands bridging the
Ta—Ta edges and one Se atom capping the square. Each Ta atom has two terminal
iodine atoms. The compound is diamagnetic and has only two electrons for metal—metal bonding. — (SOKOLOV*, M. N.; GUSHCHIN, A. L.; VIROVETS, A. V.;
PERESYPKINA, E. V.; KOZLOVA, S. G.; FEDIN, V. P.; Inorg. Chem. 43 (2004) 25,
7966-7968; Inst. Inorg. Chem., Sib. Branch, Russ. Acad. Sci., Novosibirsk 630090,
Russia; Eng.) — Schramke