Control of molecular architecture by use of the appropriate ligand isomer: a mononuclear “corner-type” versus a tetranuclear [2 × 2] grid-type cobalt(iii) complex

Abstract

Employing two isomeric pyrazine-based ligands a [2 × 2] grid-type tetranuclear cobalt(III) complex, incorporating doubly deprotonated (L^a)²⁻ ligands, and a “corner-type” mononuclear cobalt(III) complex, incorporating neutral H₂L^p ligands in a zwitterionic form, have been synthesised and structurally characterised.