Synthesis and Structures of the Capped and Sandwiched Cobalt Heptamolybdate Polyoxometalate [sub.2]][sub.3][Mo[sub.7]O[sub.24]][sub.2

Two polyoxometalate-based compounds containing the heptamolybdate anion and cobalt(II) have been synthesized, structurally characterized via single-crystal X-ray diffraction and spectroscopically analyzed with solid-state UV–Vis–NIR. The first crystal structure presented is a capped- and sandwich-st...

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Bibliographic Details
Published in:Crystals (Basel) 2022-08, Vol.12 (9)
Main Authors: Spriet, Matthieu R, Polinski, Matthew J, Mercado, Brandon Q, Villa, Eric M
Format: Article
Language:English
Subjects:
Cobalt
Crystals
Structure
Surface active agents
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Summary:Two polyoxometalate-based compounds containing the heptamolybdate anion and cobalt(II) have been synthesized, structurally characterized via single-crystal X-ray diffraction and spectroscopically analyzed with solid-state UV–Vis–NIR. The first crystal structure presented is a capped- and sandwich-style polyoxometalate (NH[sub.4])[sub.6]{[Co(H[sub.2]O)[sub.5]][Mo[sub.7]O[sub.24]] [Co(H[sub.2]O)[sub.2]][Mo[sub.7]O[sub.24]][Co(H[sub.2]O)[sub.5]]} · 6 H[sub.2]O (Co3Mo14-POM). This orange product crystallizes in the P-1 space group and has an interesting structure for polyoxometalates (POMs). Here, the cobalt(II) groups are functioning both as a bridge between two heptamolybdate units and also capping units at the top and the bottom of the polyoxometalate. The second structure, another product within the same reaction, is constructed on a similar bonding motif but now forms an extended structure: (NH[sub.4])[sub.6]{[Co(H[sub.2]O)[sub.2]][sub.3][Mo[sub.7]O[sub.24]][sub.2]} (Co3Mo14-ES). This compound also crystallizes in the space group P-1 but is easily separated due to its much darker red-violet color. These structures present themselves as a noteworthy compounds within POM-based crystal structures. Herein, the syntheses, crystal structures and characterization of these compounds are presented.
ISSN:2073-4352
2073-4352
DOI:10.3390/cryst12091201