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Carbonate encapsulation from dissolved atmospheric CO2 into a polyoxovanadate capsule

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Abstract

An aqueous synthesis, involving the reduction of the VO3 anion in a mild alkaline pH in the presence of α-Bi2O3, led to the formation of a fully reduced polyoxovanadate (POV) capsule, with CO32− anion encapsulation in its internal cavity, in the compound [Na6(H2O)24][H8VIV15O36(CO3)]·3N2H4·10H2O (1). This CO32− anion encapsulation, the source of which is absorbed aerial CO2 in the pertinent aqueous alkaline reaction mixture, occurs only in the presence of α-Bi2O3. Compound 1 crystals, upon exposure to HCl acid vapor, exclude CO2 gas that can react with the Grignard reagent (PhMgBr) to form triphenylcarbinol and benzoic acid; during this solid–vapor interface reaction, compound 1 itself transforms into an amorphous material that includes the Cl anion but could not be characterized unambiguously. Thus, we have synthesized a chloride ion (Cl) encapsulated compound [Na10(H2O)24][H3VIV15O36(Cl)]·6H2O (2) in a direct synthesis protocol, which has been characterized by crystallography as well as by other spectroscopic methods. Compounds 1 and 2, each having fifteen vanadium(IV) centers, exhibit interesting magnetism in their solid states. The temperature-dependent magnetic susceptibilities for compounds 1 and 2 have been recordred at 0.1 T in the temperature range of 3–300 K. The temperature-dependent magnetic susceptibilities of compounds 1 and 2 are shown in the form of χM vs. T and their product χMT vs. T plots.

Graphical abstract: Carbonate encapsulation from dissolved atmospheric CO2 into a polyoxovanadate capsule

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Publication details

The article was received on 13 Mar 2019, accepted on 05 May 2019 and first published on 06 May 2019


Article type: Paper
DOI: 10.1039/C9DT01103J
Dalton Trans., 2019, Advance Article

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    Carbonate encapsulation from dissolved atmospheric CO2 into a polyoxovanadate capsule

    S. Mulkapuri, S. K. Kurapati and S. K. Das, Dalton Trans., 2019, Advance Article , DOI: 10.1039/C9DT01103J

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