Auxiliary ligand effects on the structural dimensionality of copper(II) coordination complexes: from 3D networks to 1D chains

Abstract

Reaction of a hexapodal ligand 1,3,5-triazine-2,4,6-triamine hexaacetic acid (H 6 TTHA) produced two copper(II) coordination complexes {Cu 5 (HTTHA) 2 (H 2 O) 10 } n (1) and {Cu 2 (H 2 TTHA)(phen) 2 } n (2) (phen = 1,10-phenanthroline). X-ray structure determination reveals that complex 1 has a complicated 3D structure, in which three coordination styles (tetracoordinate, pentacoordinate, and hexacoordinate geometries) are all present. Complex 2, which includes a phen auxiliary ligand, exhibits an infinite 1D chain network stabilized by hydrogen bonds and p-p stacking interactions. Square [Cu 2 O 2 ] dimer units are present in both complexes.

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).…”

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.…”

L-Citrullinato-Bipyridine and L-Citrullinato-Phenanthroline Mixed Copper Complexes: Synthesis, Characterization and Potential Anticancer Activity

“…Performing a search in the CCDC database ( Figure S1 and Table 7 ) for aminoacidic Casiopeina analogs, there are more than 258 entries with phenanthroline and derivatives as the primary ligand, of which only ten correspond to polymeric complexes [ 78 , 79 , 80 , 81 , 82 , 83 , 84 , 85 , 86 ]. A common factor in all complexes, referred to as the main requirement for forming polymers, is the presence of more than one electron donor group, the carbonyl group (CO) being the most frequent.…”

“…In some cases, molecules with octahedral geometry and molecules with square pyramid geometry can be observed in the same crystal. However, an important observation is that octahedral geometries are observed when there are bridges with the counterion of the complex or the ligand has a denticity greater than 3 [ 80 , 81 , 82 , 86 , 87 , 90 , 93 , 94 , 95 ]. Square-based pyramid geometries are mainly observed when the denticity of the ligands is not greater than 3.…”