Abstract
We report here the synthesis and characterization of two new members of the M2E12 family of endohe-dral Zintl clusters,[Fe2Sn4Bi8]3-and[Cr2Sb12]3-,both of which contain open-shell metal dimers encap-sulated inside a triple-decker cluster of main-group atoms.The 75-electron[Fe2Sn4Bi8]3-cluster has a D4h-symmetric structure,while[Cr2Sb12]3-,despite having the same 75-electron count,is strongly dis-torted to a geometry that resembles a CrSb8 crown capped by a CrSb4 unit.The structural differences between the two are driven by the increasing availability of 3d electron density in the earlier transi-tion metal,which leads,ultimately,to different electronic configurations in the two clusters.The trends precisely mirror those observed in the ME10 and ME12 families containing a single transition metal ion.
万方数据