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Abstract:
Multi-centre-bonds as well as conventional two-centre two-electron bonds
are the basis for charged or uncharged homoatomic molecules of the heavy
main-group elements bismuth, selenium and tellurium. In many cases these
homoatomic species are not fairly isolated in the structures but make
use of their paired or unpaired p-electrons and, if available, of their
pi-systems to establish (strong) heteropolar covalent donor bonds to
metal cations. Such coordination can have retroactive effect on the
bonding inside the ligand and even stabilises new homonuclear species
such as the Bi-10(4+) antiprism or the Te-10-tricycle. Moreover, these
homoatomic ligands can be highly connecting, since all of their atoms
are potential donors. Here we give an overview of recent developments in
the coordination chemistry of oligo- and polyatomic selenium, tellurium
and bismuth ligands. (C) 2015 Published by Elsevier B.V.