One-dimensional ladder gallium coordination polymer.

A one-dimensional ladder-type coordination polymer, poly[[(μ ₂ -hydroxido)(μ ₂ -1 H -pyrazole-3,5-di-carboxyl-ato)gallium(III)] monohydrate], [Ga(C ₅ H ₂ N ₂ O ₄ )(OH)(H ₂ O)] _n or [Ga(HPDC)(OH)(H ₂ O)] _n , I , isotypic with a V ³⁺ coordination polymer previously reported by Chen et al. [ J. Coord. Chem. (2008). 61 , 3556-3567] was prepared from Ga ³⁺ and pyrazole-3,5-di-carb-oxy-lic acid monohydrate (H ₃ PDC·H ₂ O). 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 Ga ³⁺ moiety comprising two μ ₂ -bridging hydroxide groups, which are inter-connected by HPDC ^2- 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.
(© Simões et al. 2019.)