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Updated: Jul 17, 2026

Discovery and Synthesis Optimization of Isoreticular Al(III) Phosphonate-Based Metal-Organic Framework Compounds Using High-Throughput Methods
Published on: October 6, 2023
CO2 template synthesis of metal formates with a ReO3 net
Yun-Qi Tian1, Yu-Ming Zhao, Hai-Jun Xu
1Institute of Chemistry for Functionalized Materials, College of Chemistry and Engineering, Liaoning Normal University, Dalian 116029, China. yqtian@lnnu.edu.cn
Abstract:
The serendipitous discovery of CO2 as a template in the fabrication of ferric formate (1) has led to the preparation of serial metal(III) formates [MIII(HCOO)3.3/4CO2.1/4H2O.1/4HCOOH ]infinity (M = Fe(1), Al (2), Ga (3), and In(4)). The X-ray single-crystal determinations showed that the metals have octahedral geometries and are linked by HCOO- in the anti-anti style into a 3D ReO3 net, where CO2 molecules exist in cages of mmm symmetry and are hydrogen bonded to the formic CH groups. An X-ray powder diffraction (XRD) study revealed that 2 is identical to the documented [Al(HCOO)3.xH2O]. Further synthetic experiments and 13C NMR spectroscopy eventually confirmed that 2 should be formulated as [Al(HCOO)3.3/4CO2.1/4H2O.1/4HCOOH ]infinity, which for decades had been mistakenly given as [AlIII(HCOO)3.xH2O].
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