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The novel iron-substituted Krebs-type polyoxotungstate (C 12 N 4 H 11 ) 4 Na 2 H 5 [(Fe(H 2 O) 3 ) 2 ((FeO 2 ) 0.5 (WO 2 ) 0.5 ) 2 (β-SbW 9 O 33 ) 2 ] ( Fe-1 ) has been synthesized using  ortho -phenylenediamine (opda) as a precursor for the in situ formation of the counter cation 2,3-diaminophenazinium (C 12 N 4 H 11 ) +  (2,3-DAP).  Fe-1  has been thoroughly characterized in the solid state by single-crystal X-ray diffraction (SXRD), powder X-ray diffraction (PXRD), IR spectroscopy, and elemental analysis as well as in solution by UV–Vis spectroscopy. The crystal structure of  Fe-1  reveals  π–π -interactions between the aromatic systems of the unconventional 2,3-DAP counter cation. POM-protein interaction studies using SDS-PAGE revealed a non-proteolytic behavior of  Fe-1  towards Human Serum Albumin (HSA) as a model protein.    Graphical abstractElectronic supplementary material  The online version of this article (10.1007/s00706-019-2381-5) contains supplementary material, which is available to authorized users.

Synthesis, characterization, and POM-protein interactions of a Fe-substituted Krebs-type Sandwich-tungstoantimonate