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2.Both common oxidation states exhibit Lewis acidity (and the III state also shows Lewis basicity)in both cases resulting in complexes in which the group 15 atom¡¯s outer electron count exceeds an octet. Although the traditional bonding model in such complexes invoked d-orbitals, the bonds are now more usually described in terms of delocalized 3-center-4-electron bonds, based upon sand p-orbitals. For the Lewis acid complexes of the III oxidation state, the concept of primary E-X bonding in the parent Lewis acid (EX3, E=As, Sb, or Bi; X=halide) and secondary bonds to the Lewis base, utilizing E¨CX §Ò* as acceptor orbitals, is a useful approach. The primary/secondary bonding and the 3-center-4-electron bonds are not distinct models but may be shown to be variants of the same basic model¡£
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1. This paper briefly introduced the chemical properties of arsenic, antimony and bismuth, reviewed applications of their complexes in anti-cancer and antibacteria, and prospected the application future in the field.

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