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Issue 10, 2011
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Diverse structures and adsorption properties of quasi-Werner-type copper(II) complexes with flexible and polar axial bonds

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Abstract

The quasi-Werner-type copper(II) complex, [Cu(PF6)2(4-mepy)4] (1), in which 4-mepy is the 4-methylpyridine ligand, has flexible and polar axial bonds of Cu–PF6. Flexibility of the Cu–PF6 bonds induces diverse and unprecedented guest-inclusion structures, such as {[Cu(PF6)2(4-mepy)4][Cu(PF6)(4-mepy)4(acetone)]·PF6·4acetone} (γ-1⊃2.5acetone), {[Cu(PF6)2(4-mepy)4][Cu(PF6)(4-mepy)4(2-butanone)]·PF6·3.5(2-butanone)} (γ-1⊃2.25(2-butanone)), {[Cu(PF6)2(4-mepy)4][Cu(PF6)(4-mepy)4(H2O)]·PF6·4benzene} (γ-1⊃0.5H2O·2benzene), and {[Cu(PF6)2(4-mepy)4]·2benzene} (γ-1⊃2benzene). Exposure of the dense form, α-1, to benzene vapor affords the benzene-inclusion complex {[Cu(PF6)2(4-mepy)4]·2benzene} (γ-1⊃2benzene), all benzene guests of which are easily removed by vacuum drying, reforming guest-free, dense α-1′ with smaller sized crystals than α-1. In contrast to α-1, which shows almost no CO2 adsorption, α-1′ adsorbs CO2 gas with structural transformations, this being the first example that exhibits adsorption of gas in a dense Werner-type complex and a drastic change in adsorption properties depending on the size of the crystals.

Graphical abstract: Diverse structures and adsorption properties of quasi-Werner-type copper(ii) complexes with flexible and polar axial bonds

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Publication details

The article was received on 30 Aug 2010, accepted on 10 Dec 2010 and first published on 24 Jan 2011


Article type: Paper
DOI: 10.1039/C0DT01129K
Citation: Dalton Trans., 2011,40, 2268-2274
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    Diverse structures and adsorption properties of quasi-Werner-type copper(II) complexes with flexible and polar axial bonds

    S. Noro, T. Ohba, K. Fukuhara, Y. Takahashi, T. Akutagawa and T. Nakamura, Dalton Trans., 2011, 40, 2268
    DOI: 10.1039/C0DT01129K

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