title: Synthesis and characterization of a novel tantalum chalcogen-rich molecular cluster with square planar metal core.
abstract: Black single crystals of Ta(4)Se(9)I(8) are obtained in a high yield by heating Ta, Se, and I(2) at 300 degrees C in 1:2.2:1.0 molar ratio. In the structure, the tantalum atoms form a square, with four Se(2) 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.
authors.affiliation: Nikolayev Institute of Inorganic Chemistry, Russian Academy of Sciences, pr. Lavrentyeva 3, Novosibirsk 630090, Russia. caesar@che.nsk.su
authors.forename: Maxim N
authors.initials: MN
authors.lastname: Sokolov
authors.forename: Artyom L
authors.initials: AL
authors.lastname: Gushchin
authors.forename: Alexandr V
authors.initials: AV
authors.lastname: Virovets
authors.forename: Eugenia V
authors.initials: EV
authors.lastname: Peresypkina
authors.forename: Svetlana G
authors.initials: SG
authors.lastname: Kozlova
authors.forename: Vladimir P
authors.initials: VP
authors.lastname: Fedin