ic7b03079_si_004.cif (41.04 kB)
Linear MgCp*2 vs Bent CaCp*2: London Dispersion, Ligand-Induced Charge Localizations, and Pseudo-Pregostic C–H···Ca Interactions
dataset
posted on 2018-04-19, 13:22 authored by Rumpa Pal, Stefan Mebs, Ming W. Shi, Dylan Jayatilaka, Joanna M. Krzeszczakowska, Lorraine A. Malaspina, Michal Wiecko, Peter Luger, Malte Hesse, Yu-Sheng Chen, Jens Beckmann, Simon GrabowskyIn the family of
metallocenes, MgCp*2 (Cp* = pentamethylcyclopentadienyl)
exhibits a regular linear sandwich structure, whereas CaCp*2 is bent in both the gas phase and solid state. Bending is typically
observed for metal ions which possess a lone pair. Here, we investigate
which electronic differences cause the bending in complexes lacking
lone pairs at the metal atoms. The bent gas-phase geometry of CaCp*2 suggests that the bending must have an intramolecular origin. Geometry optimizations with and without dispersion effects/d-type
polarization functions on MCp2 and MCp*2 gas-phase
complexes (M = Ca, Mg) establish that attractive methyl···methyl
London dispersion interactions play a decisive role in the bending
in CaCp*2. A sufficient polarizability of the metal to
produce a shallow bending potential energy curve is a prerequisite
but is not the reason for the bending. Concomitant ligand-induced
charge concentrations and localizations at the metal atoms are studied
in further detail, for which real-space bonding and orbital-based
descriptors are used. Low-temperature crystal structures of MgCp*2 and CaCp*2 were determined which facilitated the
identification and characterization of intermolecular pseudo-pregostic interactions, C–H···Ca, in
the CaCp*2 crystal structure.