Abstract
Reaction between diquat (dq=6,7-dihydrodipyrido- [1,2-a:2′,1′-c] pyrazinediium) and [M (CN) 8] 4− (M=Mo or W) led to the isolation of (dq) 2 [M (CN) 8] ·5H2O salts. Both salts were found to be isomorphic. The [M (CN) 8] 4− anion has an approximately dodecahedral D2d configuration. The structure consists of a three dimensional hydrogen bonded network. The intensely coloured solids (hydrated and anhydrous) show ion-pair charge-transfer (IPCT) interaction which is discussed in terms of their structure.
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