Two sandwich arsenomolybdates based on the new building block As(iii)Mo7O279−: [Cr2(AsMo7O27)2]12− and [Cu2(AsMo7O27)2]14−†
Abstract
The polyanions [Cr2(AsMo7O27)2]12− (1a) or [Cu2(AsMo7O27)2]14− (2a) have sandwich-like structures wrapping two transition metals between two [As(III)Mo7O27]9− fragments, and the fragment is unprecedented and can be viewed as a mono-capped hexavacant B-α-Keggin subunit with a central AsO3group.