Structure and mechanical features of one-dimensional coordination polymer catena-{(μ₂-adipato-O,O′)-bis(pyridine-4-aldoxime)-copper(ii)}

Abstract

The mechanical features of catena-{(μ 2 -adipato-O,O′)-bisIJpyridine-4-aldoxime)-copperIJII)} (1) were studied by the nanoindentation technique under different loads. The newly synthesised metal-organic material 1, with a one-dimensional coordination backbone, revealed plastic deformation evidenced by the sliding steps and nanoindentation load-displacement curves and the lack of cracks inside the indentations and in its neighborhood at all load tests. The pattern of the material movement in the crystal volume and its transfer to the surface associated with the shear-induced breakage of weak interlayer forces and the breakage of hydrogen bonds within the H-bonded layer is suggested.

MOF-71 as a degradation product in single crystal to single crystal transformation of new three-dimensional Co(ii) 1,4-benzenedicarboxylate

“…49,50 On the route towards deeper understanding of the transformation pathways for rigid MOF materials and soft coordination networks, rather delicate and gradual changes of the exogenous stimuli (temperature, pressure, mechanical indentation) are needed that allow one to follow the steady changes in these materials. From our own recent work, we investigated the softness of crystals of the 1D coordination polymer catena-{(μ 2 -adipato-O,O′)-bis-(pyridine-4-aldoxime)-copperIJII)} subjected to mechanical stress in conditions of different indentation loadings upon which the crystal survived most probably due to flexibility of supramolecular H-bonded network, and the non-rigid aliphatic backbone of the adipato-linker; 51 and the pronounced anisotropy of hardness for the layered coordination polymer {…”

Anion–pyridine-n-oxime interplay to control metal–metal separations in a series of Cu(ii) coordination polymers

“…As the closest structural analogue the previously reported 1D coordination polymer [Cu(4-pyaoH) 2 (adi)] n can be mentioned where the shorter Cu⋯Cu separation of 9.692 Å is derived from the significantly more twisted conformation of the flexible adipato-residue. 18 In 4 the Cu( ii ) atom takes a tetragonal–pyramidal coordination geometry with the N 2 O 3 donor set originating from two neutral 3-pyaoH and two anionic adipato-ligands, identical ligands occupying opposite positions in the basal plane, while the aqua ligand resides in an axial position (Fig. 4b).…”

“…The survey of CSD (release 2022) reveals only three Cu-pyridine- n -oxime coordination polymers, 6,18,19 two of which are derived from our research group. Among them, the linear coordination polymer {[Cu 3 (μ 3 -OH)(2-pyao) 3 (bdc)]·6H 2 O} n (bdc = 1,4-benzenedicarboxylato) composed of trinuclear [Cu 3 (μ 3 -OH)(2-pyao) 3 ] 2+ metallacrown cores bridged by bis-carboxylato linkers revealed strong antiferromagnetic interactions between the Cu( ii ) centers within the trinuclear metallacrown core.…”

Microsphere Assemblies via Phosphonate Monoester Coordination Chemistry

“…The corresponding Ev alues for CALS-1-4 are 11.76 AE 2.54, 11.13 AE 1.21, 12.09 AE 1.85 and 9.56 AE 2.86 GPa, respectively.T hese valuesa re among the highest seen for porous MOFs, [34][35][36] although as eries of MIL-140 MOFs showY oung's modulus values largert han 100. [38][39][40][41][42] CALS-1a nd CALS-3s how higher Ha nd E than CALS-2 and CALS-4. [38][39][40][41][42] CALS-1a nd CALS-3s how higher Ha nd E than CALS-2 and CALS-4.…”

“…These values are among the highest seen for porous MOFs, although a series of MIL‐140 MOFs show Young's modulus values larger than 100 . The values of E and H are on par with values seen for some 3D dense materials, including perovskites . CALS‐1 and CALS‐3 show higher H and E than CALS‐2 and CALS‐4.…”