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Issue 21, 2011
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Synthesis, X-ray crystal structures and inclusion properties of a hydrogen-bonded coordination polymer [Ni(SCN)2(pppeH)2]·(guest)x

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Abstract

This study reports three inclusion compounds [Ni(SCN)2(pppeH)2]·(guest)x (1–3) and a guest-free crystal [Ni(SCN)2(pppeH)2] (4), where pppeH = trans-3-[4-(4-pyridyl)phenyl]propenoic acid and guest = dibenz[a,h]anthracene (x = 1/2) (1), p-bromobenzoic acid (x = 1) (2) and 4,4′-dibromobiphenyl (x = 1) (3). The crystal structures of 1–4 are best described as consisting of layers. The layer, [Ni(SCN)2(pppeH)2], is formed by R22(8) O–H⋯O hydrogen bonding between the pppeH ligands coordinating to Ni2+ ions of adjacent 1D coordination polymers. The layers of 1–3 have cavities surrounded by two pppeH dimers and four μ-1,3-SCN ligands with the dimensions of ca. 25.5 × 6.2–7.6 Å2. On the other hand, the layer of 4 does not. This indicates that the guests act as templates for the formation of the cavity. Interlayer connection of the cavities gives channels penetrating through the crystals where the guests are arranged one-dimensionally. Detailed investigation on the crystal structures of 1–3 and [Ni(SCN)2(pppeH)2]·(benz[a]anthracene)2/3 (5) reported previously has revealed that the stacking manner of the layers, the interlayer separation and the structure of the layer are adjusted in response to the guests, and simultaneously the guests adjust their positions and orientations to form a close-packed structure.

Graphical abstract: Synthesis, X-ray crystal structures and inclusion properties of a hydrogen-bonded coordination polymer [Ni(SCN)2(pppeH)2]·(guest)x

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Publication details

The article was received on 16 May 2011, accepted on 25 Jul 2011 and first published on 22 Aug 2011


Article type: Paper
DOI: 10.1039/C1CE05566F
Citation: CrystEngComm, 2011,13, 6405-6414
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    Synthesis, X-ray crystal structures and inclusion properties of a hydrogen-bonded coordination polymer [Ni(SCN)2(pppeH)2]·(guest)x

    R. Sekiya and S. Nishikiori, CrystEngComm, 2011, 13, 6405
    DOI: 10.1039/C1CE05566F

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