Solid-state cluster compounds

Group 6 Metal Chalcogenide Cluster Complexes and Their Relationships to Solid-State Cluster Compounds Taro Saito... 

GROUP 6 METAL CHALCOGENIDE CLUSTER COMPLEXES AND THEIR RELATIONSHIPS TO SOLID-STATE CLUSTER COMPOUNDS... 

The structural relationship between the molecular and solid-state compounds has been a hot issue in inorganic chemistry for some time (25-27). The extrusion (or excision) from preformed solid-state cluster compounds is one of the major synthetic methods of the preparation of cluster complexes (26). Use of cluster complexes as precursors to solid-state cluster compounds is the reverse reaction of excision. Both reactions utilize the structural similarity of the metal cluster units. The basic cluster units of polyhedra (deltahedra) or raft structures are triangles, and both molecular and solid-state clusters with octahedral, tetrahedral, and rhomboidal cores have been reported. Similarity of other properties such as electronic structures based on the cluster units is also important. The present review is concerned with the syntheses and structures of the cluster complexes of the group 6 metals and with their relationships to solid-state chemistry. 

If steric effects in solid-state cluster compounds could be eliminated by the isolation of discrete molecules with the same cluster units as Chevrel phases, a part of the preceding problem would be solved. The structures of the cluster molecules in the isolated state free from the crystal packing effects are most suitable for such discussion. The geometry of free molecules in vacuum cannot be known from X-ray structure determination, and usually it is difficult to measure crystal packing effects in molecular crystals. In the case of metal complexes with sym-... 

B7.27 Group 6 metal chalcogenide cluster complexes and their relationships to solid-state cluster compounds... 

E. Relationship to Solid-State Cluster Compounds i. Structure of Chevrel Phases... 

---