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Cyclophosphazenes (RNH) 6 P 3 N 3 1 react with three and six equivalents of butyllithium in thf to give lithium complexes of tri- (2) and hexaanionic (3) phosphazenate ligands, respectively. A variety of lithium complexes 2 and 3 were prepared and structurally characterised. The degree of puckering of the (PN) 3 ring systems correlates with increasing ligand charge...
X-ray crystal structure determination shows that both terminal selenium centres of the Se 42 --chain in (TMEDA) 2 Li 2 Se 4 (TMEDA=N,N,N',N'-tetramethylethylenediamine) are bridging both lithium centres, while the central Se-atoms are loosely coordinated towards the metal centres, resulting in a distorted trigonal prismatic Li 2 Se 4 core.
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