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. 2019 Oct 3;75(Pt 11):1607-1612.
doi: 10.1107/S2056989019013446. eCollection 2019 Nov 1.

One-dimensional ladder gallium coordination polymer

Andrea B Simões  1 , Flávio Figueira  1 , Ricardo F Mendes  1 , Jéssica S Barbosa  1   2 , João Rocha  1 , Filipe A Almeida Paz  1
Affiliations

One-dimensional ladder gallium coordination polymer

Andrea B Simões et al. Acta Crystallogr E Crystallogr Commun. .

Abstract

A one-dimensional ladder-type coordination polymer, poly[[(μ2-hydroxido)(μ2-1H-pyrazole-3,5-di-carboxyl-ato)gallium(III)] monohydrate], [Ga(C5H2N2O4)(OH)(H2O)] n or [Ga(HPDC)(OH)(H2O)] n , I, isotypic with a V3+ coordination polymer previously reported by Chen et al. [J. Coord. Chem. (2008). 61, 3556-3567] was prepared from Ga3+ and pyrazole-3,5-di-carb-oxy-lic acid monohydrate (H3PDC·H2O). Compound I was isolated using three distinct experimental methods: hydro-thermal (HT), microwave-assisted (MWAS) and one-pot (OP) and the crystallite size should be fine-tuned according to the method employed. The coordination polymeric structure is based on a dimeric Ga3+ moiety comprising two μ2-bridging hydroxide groups, which are inter-connected by HPDC2- anionic organic linkers. The close packing of individual polymers is strongly directed by the supra-molecular inter-actions, namely several O-H⋯O and N-H⋯O hydrogen-bonding inter-actions.

Keywords: coordination polymers; crystal structure; gallium.

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Figures

Figure 1
Figure 1
Scanning electron microscopy (SEM) images of bulk [Ga(HPDC)(OH)(H2O)] (I) obtained by microwave-assisted synthesis (MWAS), hydro­thermal synthesis (HT) and a one-pot process (OP).
Figure 2
Figure 2
(a) Schematic representation of the asymmetric unit of [Ga(HPDC)(OH)(H2O)] (I) showing all non-H atoms shown with displacement ellipsoids drawn at the 50% probability level and H atoms as small spheres with arbitrary radii. The coordination sphere of the crystallographically independent metal centre was completed by generating the remaining atoms through symmetry. [Symmetry codes: (i) −x, −y, −z + 2; (ii) x, y, z + 1 (b) Ga3+ dimer formed by two symmetry-related bridging hydroxyl groups.
Figure 3
Figure 3
Schematic representation of the (a) one-dimensional ladder-type coordination polymer present in I, and (b) the close packing of the polymers viewed along the [010] direction of the unit cell.
Figure 4
Figure 4
Schematic representation of a portion of the crystal packing of [Ga(HPDC)(OH)(H2O)] (I) depicting the O—H⋯O and N—H⋯O supra­molecular contacts (orange dashed lines) between ladder-type polymers. For geometrical details on the represented inter­actions see Table 2 ▸ (the symmetry codes used to generate equivalent atoms have been omitted for clarity).
Figure 5
Figure 5
Crystal packing of [Ga(HPDC)(OH)(H2O)] (I) viewed along the [001] direction of the unit cell.
See this image and copyright information in PMC

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