Structural Invariance of a ZnII Coordination Polymer with 5-Aminoisophthalic Acid under Different Synthetic Conditions

Abstract

A same coordination polymer [Zn(aip)(DMSO)] (aip: 5-aminoisophthalate and DMSO: dimethylsulfoxide) was synthesized using the same reactants (ZnSO 4 , aip and H 2 O/DMSO) but in different conditions, in which the stoichiometry (1:1-4:1 metal:ligand ratio), temperature (70 and 100 °C) and synthetic method (liquid-liquid diffusion, solvothermal and conventional with stirring) varied. A liquid assisted mechanochemical approach using ZnO as Zn II source instead ZnSO 4 , but keeping DMSO as milling liquid, also resulted in the same compound. This new coordination polymer was investigated using single-crystal X-ray diffraction technique, revealing a two-dimensional honeycomb-type network formation. The crystal structure was compared with either similar or isostructural compounds reported in the literature. Our studies show that the synthetic method and other synthetic variables do not affect the formation of [Zn(aip)(DMSO)] coordination polymers and probe the high stability (thermodynamic and kinetic) and structural invariance of this structure.

Polymorphic Derivatives of NiII and CoII Mesocates with 3D Networks and “Brick and Mortar” Structures: Preparation, Structural Characterization, and Cryomagnetic Investigation of New Single-Molecule Magnets

“…The breakthrough in the crystal engineering and molecular materials fields has allowed for the design of a wide variety of molecular materials useful to many different technological applications. , In this sense, a judicious choice of functional linkers in the controlled design of such materials is of utmost importance. By a combination of different ligands, a huge number of coordination compounds and frameworks showing fascinating topologies and architectures can be constructed, − opening new avenues for the application of these multifunctional materials. − …”

“…In fact, the rational choice of the proper building blocks, counterions, and solvents and the control of parameters as temperature, pH, and crystallization methods ,,− are important keys during the development of such materials in conjunction with the manipulation of their properties. , As an example of a supramolecular controlled property, simple weak C–H···N-type interactions were responsible for generating additional chemical pressure to stabilize the LS state of cobalt­(II) ions in a mononuclear complex of formula [Co­(tppz) 2 ]­(tcm) 2 (tppz = 2,3,5,6-tetrakis­(2-pyridyl)­pyrazine ligand and tcm = tricyanomethanide anion), which exhibits a thermally induced spin-crossover (SCO) behavior.…”