Short communicationUnusual formations of superoxo heptaoxomolybdates from peroxo molybdates

Add time:10/01/2019    Source:sciencedirect.com

Two novel dioxygen heptaoxomolybdates K5[Mo7O22(O2)(OH)]Cl·6H2O (1) and K5[Mo7O22(O2)(O2)]·8H2O (2) were isolated from the solution of peroxo molybdate accidently. The solids were characterized by IR, EPR and X-ray single crystal analysis. Complex 1 contains a superoxo group with a short bond distance 1.27(1) Å, while 2 is a mixed complex with peroxo and superoxo groups [1.43(1), 1.27(1) Å]. All of the dioxygen groups coordinate to molybdenum atoms in side-on (η2) fashion. The two complexes are short-lived and will decompose into peroxo molybdates K5[Mo7O21(O2)2(OH)]·6H2O (3) and K6[Mo7O22(O2)2]·9H2O (4) very quickly.

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