A. J. Schultz

The role of anions on the crystal structures and electrical properties of the organic metals and superconductors, (BEDT-TTF)2X (X = trihalide anions)

Abstract A systematic study of the crystal structures of (BEDT-TTF) 2 X salts [BEDT-TTF is bis-(ethylenedithio) tetrathiafulvalene, C 10 S 8 H 8 , and X is a linear trihalide anion] reveal that the different packing motifs for the BEDT-TTF molecules are directly related to the electrical properties of these materials. The packing of the organic molecules is influenced by the cation-anion interactions of the -CH 2 …X − type and is observed to change systematically with anion size.

Scientific Review: Single Crystal Analyses of the Structure and Bonding in Transition-Metal σ-Complexes

Transition-metal _σ-complexes [2] are coordination compounds in which two electrons in an X-H _σ-bond form a dative bond with a transition metal as illustrated in Figure 1. This bond can be further stabilized by π-backbonding from the metal to the X-H σ* antibonding orbital. Transition-metal σ-complexes are typically reactive intermediates that precede oxidative addition of substrates having an X-H bond. σ-complexes are, therefore, intermediates in catalytic hydrogenation (X = H), activation and functionalization of hydrocarbons (X = C), hydro-silylation (X = Si), and hydroboration (X = B) reactions.