The heteropolyanions [Bi 2 W 22 O 74 (OH) 2 ] 12-(1) and [X 2 W 20 M 2 O 70 (H 2 O) 6 ] (14-2n)-(X ) Sb 3+ , Bi 3+ ; M n+ ) Fe 3+ , Co 2+ , Zn 2+ ) (2-7) have been synthesized as alkali metal and ammonium salts, respectively, and characterized by elemental analysis, infrared spectroscopy, and X-ray crystallography. These tungsto bismutates and antimonates reveal one common feature: the trivacant -B-XW 9 O 33 Keggin fragment as the structural building unit. Formally, the unit can be derived from the Keggin structure by removing one trimetalate fragment, W 3 O 13 , and a 60°rotation of one of the remaining W 3 O 13 subunits around the X-O W3X bond vector (the subscript indicates the element(s) bonded). The unshared pair of electrons of the respective central, pyramidally coordinated heteroatom Sb III or Bi III prevents formation of the complete spherical structure. In the presented heteropolyanions 1-7, two -B-XW 9 O 33 units are connected by two WO 2 groups. Further stabilization of this hitherto unknown bis-decatungsto ion [X 2 W 20 O 70 ] 14-is reached either by addition of two formal fac-WO 3 anti-Lipscomb's rule units to give the bis-undecatungsto bismutate [Bi 2 W 22 O 74 (OH) 2 ] 12-(1) or by addition of two M n+ (H 2 O) 3 groups (M n+ ) Fe 3+ , Co 2+ , Zn 2+ ) forming the large, transition-metal-substituted heteropolyanion clusters [X 2 W 20 M 2 O 70 (H 2 O) 6 ] (14-2n)-(X ) Sb 3+ , Bi 3+ ; M n+ ) Fe 3+ , Co 2+ , Zn 2+ ) (2-7).
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.