Temperature-Induced Syntheses, Iodine Elimination, Enantiomers Resolution, and Single-Crystal-to-Single-Crystal Transformation of Imidazole-Co(II) Coordination Polymers with Amino-isophthalic Acid as Co-Ligand

Abstract

On the basis of a temperature-induced effect, the solvothermal reaction of Co­(Ac)2·4H2O, 5-amino-2,4,6-triiodoisophthalic acid (H2atibdc), and 1,4-bis­(2-methyl-imidazol-1-yl)­butane (bib) at 80 °C gave a new coordination polymer [Co­(bib)­(atibdc)] (1), which shows a two-dimensional (2D) network with left- and right-handed helical chains. By raising the reaction temperature to 130 °C, a pair of homochiral enantiomers [Co­(bib)­(atibdc)]­·2H2O (2, 2M, and 2P) were successfully obtained, displaying a three-dimensional (3D) framework with three kinds of unique helical chains. Keeping the temperature of the reaction system to 150 °C, excited, an in situ iodine elimination reaction occurred, and a new linker 5-aminoisophthalic acid (H2aipa) was generated, which then cooperated with the bib ligand to construct a coordination polymer [Co­(bib)­(aipa)] (3), showing a 3D 3-fold interpenetrating architecture. The comparison of final solid structures exhibits an exclusive temperature-induced effect on the construction of the coordination polymer. Furthermore, via a single-crystal-to-single-crystal (SCSC) transformation, the 2D network of 1 can be derived from the 3D framework of 2, which presents a rare type of temperature-solvent induced SCSC transformation. In addition, the magnetic properties of 1–3 have been investigated as well.

Synthesis and crystal structure of a 6-chloronicotinate salt of a one-dimensional cationic nickel(II) coordination polymer with 4,4′-bipyridine

“…The organic ligands, used as building blocks in the construction of coordination polymers, need to be multifunctional, which is evident from the position, coordination ability and steric hindrance of their donor atoms and/or groups. The design of functional coordination polymers with the desired structures is not always straightforward and is strongly dependent on the experimental conditions including the type of solvents, starting metal salts, additional ligands, temperature, hydrothermal conditions and pH value (Li et al, 2016;Zhou et al, 2016;Gu et al, 2016). Aromatic carboxylic acids with additional functional groups have become popular in the design of coordination polymers.…”

Effect of synthesized temperature on the assembly and properties of four lanthanide supramolecular frameworks

“…It is clear that the temperature plays an important role in the resulting products. Thus, CPs species that can be systematically tuned by one factor and undergo structural transformations still remain largely unexplored thus far, and this work presents a good case of temperature effects [2,13].…”

“…Coordination polymers (CPs) have attracted increasing interest because of their fascinating motifs and excellent applications in the fields of luminescence, catalysis, and drug delivery [1]. As we know, the construction of CPs is influenced by several factors, such as the central metal ions, organic carboxylate ligands, reaction temperature, and so on [2][3]. Any subtle change of one of the mentioned factors may lead to a drastic change in the dimensionality and properties [4].…”

A new copper(II) supramolecular coordination polymer and a dinuclear compound with multifunctional 2-amino-5-sulfobenzoic acid and flexible N-donor ligands: synthesis, structure and characterization

“…Recently, chemists have accorded much attention to the rational design and construction of metal-organic coordination polymers (MOCPs) with differing dimensionality because MOCPs incorporate the advantages of the inorganic metal ions and the organic linkers, resulting in fascinating architectures (Leong & Vittal, 2011;Zhou, He et al, 2016) and potential applications in gas sorption (He et al, 2015), catalysis (Wei et al, 2014), drug delivery (Gao et al, 2013), electrochemistry (Nafady et al, 2014), magnetism (Hawes et al, 2015), sensing (Lv et al, 2015) and as energetic materials (Zhang, Yang et al, 2016;Shu et al, 2017). Supramolecular coordination polymers (SCPs) are assembled by noncovalent van der Waals forces, such as hydrogen bonding andstacking interactions.…”