Remarkable multimember-ring configurations in a new family of Na7MIISb5S12 (MII = Zn, Cd, Hg) exhibiting various three-dimensional tunnel structures†
Abstract
A new family of Na7MIISb5S12 (MII = Zn, Cd and Hg) are the first examples exhibiting the unusual 12 + 12 multimember-ring (MR) configuration and an interesting (MII/Sb)3S9 trimer. Moreover, ELF and EDD calculations also reveal that the tetrahedral configurations for the MII/Sb atoms are reasonable and their large birefringences originate from the stereochemically active lone pair effect of the Sb atoms.