摘要：

Reaction of (η 5-C 5H 5) 2Mo 2(CO) 6 with selenium and sodium in DMF yields [(η 5-C 5H 5)Mo(Se 4) 2] ( 1), which was crystallized with Ph 4P + and characterized by crystal structure determination. With two chelating tetraselenide ligands, 1 is the first member of a new class of mono(cyclopentadienyl)-bis(polychalcogenide) metallates, distinct from existing compounds which are formulated [(η 5-C 5R 5) 2M(E x)] (E = S, Se; x = 3, 4, 5). (Ph 4P) 2[Sn(Se 4) 3] ( 2), from reaction of selenium, sodium, SnCl 2 and Ph 4PBr in DMF, shows no evidence in its crystal structure of the disordered ring size and conformation found in polysulphide homologues.

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