An unprecedented [{Fe5O5(OH)2(OAc)2}2{W2O2(OH)}] cluster sandwiched in the tetravacant tungstophosphate

A novel tungstophosphate H12Na4K3[{Fe5O5(OH)2(OAc)2}2{W2-O2(OH)}{P2W14O59}2]·36H2O (1) containing an unprecedented [{Fe5O5(OH)2(OAc)2}2{W2O2(OH)}] unit has been successfully obtained and characterized by IR, TGA, magnetic and single-crystal X-ray diffraction. It shows a decameric FeIII molecular assembly through two {Fe5O23} subunits bridged by a {W2O3} motif.