Luis Fernando Piedra-Garza - Jacobs University

Chapter I. Iso- and Heteropolyoxometalates. An Introduction
Table 1.1. Diversity of POMs with some examples. 21
Isopolyanions [V 4 O 12 ] 4- , [Ta 6 O 19 ] 8- , [Mo 7 O 24 ] 6- , [W 10 O 32 ] 4-
Heteropolyanions [PW 12 O 40 ] 3- , [P 2 W 18 O 62 ] 6- , [PV 14 O 42 ] 9- , [MnMo 9 O 32 ] 6-
Isopoly- and
heteropolyanions
with mixed
addenda atoms
Functionalized
POMs
Organometallic
and alkoxo
derivatives
Cryptand/Clathrate
POMs
Polymeric species
[Nb 2 W 4 O 19 ] 4- , [PV 2 Mo 10 O 40 ] 5-
[PW 11 O 39 RhCH 2 COOH] 5- , [{PhSbOH} 3 (A-α-PW 9 O 34 ) 2 ] 9-
[PW 12 O 39 (OMe)] 2- , [V 6 O 13 {(OCH 2 ) 3 (CNO 2 )} 2 ] 2-
[│Na(H 2 O)│P 5 W 30 O 110 ] 14- , [│Cl│V 18 O 42 H 4 ] 9-
{[{(CH 3 ) 2 Sn} 2 (W 6 O 22 )] 4- } ∞ , {[V 5 O 14 ] 3- } ∞
It is important to insist that Table 1.1 illustrates only a small portion of the
variety of polyanions that have been synthesized and characterized up to date,
nonetheless the broad nomenclature Isopoly- and heteropolyanion gave by Pope
is the adequate one independent of the nature of other atoms, organic groups
or derivatives that may be present in the polyanion.
The following paragraphs are devoted to explore briefly the structural
features of the Anderson-Evans, Lindqvist, Keggin, Wells-Dawson as well as
a class of heteropolytungstophosphate and -arsenate species; since most of the
structures reported in this work are based on the latter and Keggin species,
special attention will be dedicated to these polyanions. If not described
otherwise, polyhedral representation of polyanions will be used through this
work. The octahedral nature of the MO 6 building block of all polyanions
permits a more easy understanding of the structural features of such
compounds.
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