Supramolecular architectures based on various macrocyclic metallic tectons with 1,3,5-triazine-2,4,6-triamine hexaacetic acid ligand

Abstract

Reactions of series of macrocycle derivatives [Ni(hto)]Cl 2 $2H 2 O (1) (hto ¼ 1,3,6,9,11,14-hexaazatricyclo[12.2.1.1 6,9 ]octadecane), [Ni(CHA)](ClO 4 ) 2 (2) (CHA ¼ 1,3,6,8,11,11 ] octadecane), [Ni(PCHA)](ClO 4 ) 2 (3) and [Cu(PCHA)](ClO 4 ) 2 (4) 3,6,8,11,11 ]octadecane), with a flexible hexapodal ligand H 6 TTHA (H 6 TTHA ¼ 1,3,5triazine-2,4,6-triamine hexaacetic acid) resulted in eight supramolecular coordination polymers (SCPs), formulated as a- 12). These compounds are structurally characterized by X-ray diffraction analyses. The predominant driving forces that connect macrocyclic metallic tectons with hexaacetic acid ligand in compounds 5-12 are hydrogen bonds, by which the compounds assemble into SCPs with versatile structures. The single-crystal X-ray diffraction analysis reveals that compounds 5 and 6 contain a rhombic 2-D layer network structure constructed of hydrogen bonds. Compound 7 exhibits a 3-D supramolecular network with 12 Â 10.4A 2 1-D brick wall net structure along the c-axis, and all the water molecular guests adorned the brick wall net. Compounds 8 and 9 show a nonporous 3-D framework also stabilized by the hydrogen bonds. Tuning by solvents, in compound 10, an elliptical 2-D network was found to accommodate water molecules and perchlorate in the channels, with grid dimensions of 11 Â 10 A 2 ; compounds 11 and 12 show 2-D honeycomb-like networks with diameter 12 A. In conclusion, the crystal structures and regulatory effect of thev N-donor on the macrocyclic ligands in these compounds are discussed.

Thorium–Organic Framework Constructed with a Semirigid Triazine Hexacarboxylic Acid Ligand: Unique Structure with Thorium Oxide Wheel Clusters and Iodine Adsorption Behavior

“…Through a systematic study, it is found that there are 31 binding modes of the H 6 TTHA ligand that have been reported in previous literature (Tables S3 and S4). − ,− ,− Many MOFs assembled from H 6 TTHA ligands and transition metal ions, rare earth ions, alkali metal ions, alkaline earth metal ions, and uranyl ions have been reported in the literature. The MOFs based on the H 6 TTHA ligand and Th­(IV) have not been reported.…”

A Highly Stable 3D Luminescent Indium–Polycarboxylic Framework for the Turn-off Detection of UO22+, Ru3+, and Biomolecule Thiamines

“…Every central In 3+ ion is hexa-coordinate by carboxyl oxygen atoms (O1, O5C, O6A) from three H 2 TTHA 4– ligands, hydroxyl oxygen atoms (O7, O7B), and O8 come from coordinated H 2 O, to form a slightly distorted [In­(μ 2 -O) 2 O 4 ] square bipyramid geometry. The In–O distance is 2.109(2)–2.205(2) Å, through checking published literature, the average value about 2.42 Å. − For the H 6 TTHA ligand, lots of coordination modes have been continually reported, as shown in Table S2. − Surprisingly, the H 6 TTHA ligand in complex 1 reported herein exhibits distinctly unique coordination mode . The 4-fold deprotonated H 2 TTHA 4– ligand connects six In 3+ ions (μ 6 -bridge) through syn–anti bridging and monodentate carboxylate moieties (Figure b).…”

Multifunctional Uranyl Hybrid Materials: Structural Diversities as a Function of pH, Luminescence with Potential Nitrobenzene Sensing, and Photoelectric Behavior as p-type Semiconductors

“…So far, a series of compounds constructed from the 1,3,5-triazine-2,4,6-triamine hexaacetic acid (H 6 TTHA) containing three iminodiacetic acid groups, which can adopt versatile conformations according to the geometric requirements of different metal ions, have been continually reported. , By a systematic comparison in terms of conformations and coordination modes of the ligand, seven types of TTHA conformations (I → VII) and 24 kinds of coordination modes could be clearly observed (Scheme ). To our surprise, the ligands of compounds 1 – 3 reported herein exhibit distinctly different coordination modes.…”

“…Comparing it with the traditional rigid ligands, it can adopt multiple conformations and bonding modes to meet the geometrical requirements of the central metal ions, e.g., syn-syn , anti-anti , syn-anti , and monomonodentate and monobidentate, and so forth, which result in a variety of structural frameworks. Several coordination polymers related to ligand H 6 TTHA with a wide variety of metal ions, such as Na, Mg, Cu, Zn, and so on, have been reported, which display versatile conformations and coordination modes. , It becomes imperative to explore more, different structural landscapes of multicomponent systems consisting of metal ions and the flexible ligand H 6 TTHA to understand factors governing their aggregation in different crystallization conditions. Meanwhile, some of these compounds based on the ligand H 6 TTHA were found to exhibit a variety of outstanding properties.…”