Supramolecular architectures of metal complexes containing 4-sulfobenzoate dianion and 1,2-bis(4-pyridyl)ethane

Crystal architectures of copper and zinc metal complexes containing 2-thiophenepropionate and 1,2-bis(4-pyridyl)ethane building blocks

“…Figure 5 shows that such bands appear shifted to higher wavenumbers when this ligand is coordinated with the metal ion [12,20]. In this work the band at 1596 cm -1 , assigned to n(CC)/n(CN) for the free ligand, can be observed for all the complex a shift to higher wavenumbers, probably caused by the strengthening of the chemical bond, mainly due to the participation of non-bonding electrons in the chemical bond.…”

“…Due to the metal ion coordination geometry, the absence of water molecules (both coordination and hydration) and a significant distance between the pyridyl rings centroids (4.452(2) Å), supramolecular interactions involving π-stacking and/or hydrogen bonds were not observed, which would contribute to the stability of the structure. Figure 3(a) exhibits two bpa ligands acting in two distinct ways: as a bis-monodentate moiety and also bridging the adjacent metallic centers, assuming a Trans (or T) conformation [12]. The bpa ligand present in the bc-plane on Figure 3 shows N-to-N separation distances of 9.264(2) Å and interplanar deviation of pyridyl rings of 52.12°.…”

“…However, several supramolecular architectures are formed simply by the contribution of non-covalent intermolecular forces such as hydrogen-bonding, π-stacking, electrostatic and van der Waals [12]. In many cases such interactions can also be used to predict a possible complicated array, under the crystal engineering field point of view [13].…”

Syntheses, Crystal Structures, and Properties of Three Copper(II) Complexes Constructed by 4‐(4,6‐Bis(1H‐pyrazol‐1‐yl)‐1,3,5‐triazin‐2‐yl)morpholine

“…The properties of supramolecular materials are often directly controlled by their unique complex architectures, pushing many researchers towards a better understanding of the fundamental principles governing supramolecular science. Actually, noncovalent interactions such as hydrogen bonds, π–π stacking, and anion–π interactions play an important role in forming different supramolecular frameworks . Polydentate N‐donor ligands based on pyrazolyl and s‐triazine rings are good choices in the study of supramolecular coordination chemistry, because they are favorable to produce π–π stacking and anion–π interactions …”

“…Actually, noncovalent interactions such as hydrogen bonds, ππ stacking, and anion-π interactions play an important role in forming different supramolecular frameworks. [9][10][11][12][13] Polydentate N-donor ligands based on pyrazolyl and s-triazine rings are good choices in the study of supramolecular coordination chemistry, because they are favorable to produce π-π stacking and anion-π interactions. [14][15][16] In our previous study, we reported the polydentate ligand [4-(4,6-bis(1H-pyrazol-1-yl)-1,3,5-triazin-2-yl)morpholine] (L) and its preliminary reactivity behaviors with transitional metals Co II , Mn II , Cr III , and Fe III .…”