Polyselenides metal complexes

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The chemistry of polyselenides, polytellurides, and their metal complexes is very well established. Typical structures of polyselenide dianions are shown in Fig. 16.8.5. In these species, the Se-Se bond distances vary from 227 to 236 pm, and the bond angles from 103° to 110°. The tethered monocyclic structure of Se - in the complex Sr(15-C5)2(Se9) has a three-connected Se atom forming two long and one normal Se-Se bonds at 295, 247, and 231 pm (anticlockwise in Fig. 16.8.5, with the longest bond represented by a broken line). The other Se-Se bonds are in the range 227-39 pm. 

Although Se and Te analogues of polysulfanes do not extend beyond the poorly characterized H2Se2 and H2Te2, the chemistries of polyselenides, polytellurides and their metal complexes are well established. Equations 15.43-15.46 illustrate preparations of salts of [Se ] and [Te ] see Section 10.8 for details of crown ethers and cryptands. 

Dhingra, S. Kanatzidis, M. G. 1990. The use of soluble metal-polyselenide complexes as precursors to binary and ternary solid metal selenides. Mater. Res. Soc. Symp. Proc. 180 825-830. 

The reaction of uranium metal with polyselenides in molten potassium polyselenide generates an interesting molecular diselenide complex K4[U(r/ -Se2)4], containing a discrete U( 7 -Se2)4 anion. 

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