One-dimensional ladder gallium coordination polymer


A one-dimensional ladder-type coordination polymer, poly[[(mu(2)-hydroxido)(mu(2)-1H-pyrazole-3,5-dicarboxylato)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-dicarboxylic acid monohydrate (H3PDC center dot H2O). Compound I was isolated using three distinct experimental methods: hydrothermal (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 mu(2) -bridging hydroxide groups, which are interconnected by HPDC2- anionic organic linkers. The close packing of individual polymers is strongly directed by the supramolecular interactions, namely several O-H center dot center dot center dot O and N-H center dot center dot center dot O hydrogen-bonding interactions.



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Simoes, AB; Figueira, F; Mendes, R; Barbosa, JS; Rocha, J; Paz, FAA

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This work was developed within the scope of the project CICECO-Aveiro Institute of Materials, FCT Ref. UID/CTM/50011/2019, financed by national funds through the FCT/MCTES. The research contract of FF (REF-168-89-ARH/2018) is funded by national funds (OE), through FCT (Fundacao para a Ciencia e a Tecnologia, IP), in the scope of the framework contract foreseen in Nos. 4, 5 and 6 of article 23 of the Decree-Law 57/2016, of August 29, changed by Law 57/2017, of July 19. ABS also acknowledges the scholarship BIC/UI89/8428/2018. The authors are also grateful to the Portuguese NMR Network (RNRMN). FCT is also gratefully acknowledged for the PhD grant No. PD/BD/135104/2017 (to JSB) and for the Junior Research Position for RFM (CEECIND/00553/2017).

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