MS36-P20 Crystal structure and thermal and mechanical properties of a herringbone-type CuII-based solid coordination frameworkSolid coordination frameworks (SCF) represent one of the most studied materials during the last decade thanks to the variety of structures that can be formed by using metal complexes as synthons.1 In fact, combination of polycarboxylate anions and dipyridyl ligands is an effective strategy to produce SCF compounds, and we have previously reported on CuII-based SCFs exhibiting PDC (2,5-pyridinedicarboxylate) in combination with bpe (1,2-di(4- pyridyl)ethylene)), bpa(1,2-di(4-pyridyl)ethane), and dpk (di-2-pyridyl ketone). The use of bpe and bpa as dipyridyl ligands produces 3-connected herringbone structures, and so far our main contribution to the study of this type of structures consists on the identification of two types of herringbone arrays (4-c and 3-c where c stands for “connected”) depending on the number of connections for each metal node. While M1A1B1 stoichiometry corresponds to 4-c arrays, M2A2B stoichiometry corresponds to 3-c ones (M is the metal ion, and A and B are the organic ligands). Additionally, we also identified the structural parameters defining the 3-c herringbone arrays and observed a correlation between angles and distances in this type of structure.
In this context, this work is focused on the synthesis and characterisation of the compound [Cu2(PDC)2(4,4´-bipy)(H2O)2]·MeOH (where 4,4´-bipy is 4,4′-bipyridine and MeOH is methanol) with the aim of studying the influence of distinct dipyridyl ligands on the as-obtained characteristics materials. The compound crystallises in the monoclinic system (P 21/n, a=11.3583 Å, b=9.2348 Å, c=12.6150 Å, β=102.254°). Thermogravimetric analysis reveals that it is stable up to 280°C. Nanoindentation experiments on single crystals produced values of the E Young modulus between 1.325 GPa and 9.860 GPa, and values of the hardness between 0.030 GPa and 0.401 GPa depending on the crystal face.References:
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Keywords: CuII-based SCF; herringbone 2D-structure, nanoindentation