SO₄²⁻ anion directed hexagonal-prismatic cages via cooperative C–H⋯O hydrogen bonds

Abstract

Hexagonal-prismatic cages are constructed from cubane-like Ni4(μ3-OH)4 clusters generated in situ and clip-like organic ligands.

Molecular Dynamics Simulations of Micelle Properties and Behaviors of Sodium Lauryl Ether Sulfate Penetrating Ceramide and Phospholipid Bilayers

“…Finally, the numbers of hydrogen bonds formed between the SLE2S-surfactant head and other ceramide (system 5) and DMPC bilayer (system 6) components were calculated while the surfactant was partitioning into the bilayers and are illustrated in Figure , where hydrogen-bond formation is defined as in ref and oxygen atoms in surfactant head sulfate and OE groups act as hydrogen-bond acceptors. , Figure a clearly shows that, although the number of SLE2S-surfactant and water-molecule hydrogen bonding interactions decreased, surfactant inside the ceramide bilayer can be stabilized through hydrogen-bonding interactions between surfactant heads and ceramide lipid molecules, where ceramide head hydroxyl and N–H groups act as hydrogen-bond donors. Such hydrogen-bonding interactions between surfactant and lipid molecules cannot be established in the DMPC bilayer because no hydrogen-bond donors exist in the DMPC molecule (Figure b).…”

Controllable Coordination Self‐Assembly Based on Flexibility of Ligands: Synthesis of Supramolecular Assemblies and Stimuli‐Driven Structural Transformations

“…Our initial attempts to prepare such metal clusters were not successful until a novel cubane-like hydroxyl metal cluster Ni 4 (m-OH) 4 as shown in Scheme 4 had been in situ synthesized. [88] It contained four Ni(II) ions and four m-OH À groups occupy eight corners of the cube alternately. More importantly, such in situ formed Ni 4 (m-OH) 4 metal cluster could provide another 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 6 coordination sites for further self-assembly.…”

“…Using complex metal clusters which can provide high‐symmetry coordination geometries as acceptors may overcome such challenge. Our initial attempts to prepare such metal clusters were not successful until a novel cubane‐like hydroxyl metal cluster Ni 4 ( μ ‐OH) 4 as shown in Scheme had been in situ synthesized . It contained four Ni(II) ions and four μ ‐OH − groups occupy eight corners of the cube alternately.…”

Anion Recognition Based on a Combination of Double-Dentate Hydrogen Bond and Double-Side Anion−π Noncovalent Interactions

“…Anion recognition has become a promising branch of supramolecular chemistry during the last 2 decades. − The pioneering work of anion recognition and binding was derived from the research on encapsulation of halide anions by protonated diazabicycloalkane ammonium ions, which was reported by Park and Simmons in 1968 . In the 1990s, it was found that anions play a crucial role in natural as well as artificial systems, and their significance in different chemical and biological processes was recognized later in recent years. , While design and synthesis of efficient and selective anion receptors is one of the most significant topics of supramolecular chemistry, study of the recognition mechanism is also important. − Many binding forces, such as electrostatic interaction, hydrogen bond (HB), halogen bond, metal/Lewis acid coordination, and anion−π have been widely studied in anion recognition, in which the HB has been most intensively investigated. So far, a number of neutral HB anion receptors have been designed and prepared based on amide and (thio)­urea groups, − as well as aromatic systems. − …”