Chalcogenide substitution reactions

The feasibility of preparing tellurometalates from selenometalates has been demonstrated by the preparation of the compounds [PPh 4 ] 4 °Ni 4 Te 4 (Te 2 ) 2 (Te 3 ) 4 ] and [PPh 4 ] 4 °Pt 4 Te 4 (Te 3 ) 6 ] from the reactions in DMF of TePEt 3 with [PPh 4 ] 2 °Ni(Se 4 ) 2 ] and [PPh 4 ] 2 °Pt(Se 4 ) 3 ], respectively. The NEt 4 + salt of the [Pt 4 Te 4 (Te 3 ) 6 ] 4- ion could also be isolated from the reaction of Pt(xan) 2 with Li 2 Te and Te in DMF