Publications by authors named "J H Holstein"
Dynamically interconvertible metallo-supramolecular multicomponent assemblies, coexisting orthogonally in solution, serve as simplified mimics for complex networks found in biological systems. Building on recent advances in controlling the nonstatistical self-assembly of heteroleptic coordination cages and heteromeric completive self-sorting, i.e.
View Article and Find Full Text PDFPrecise control over the catenation process in interlocked supramolecular systems remains a significant challenge. Here, we report a system in which a lantern-shaped PdL cage can dimerize to form two distinct PdL catenanes with different interlocking degree: a previously described quadruply interlocked double cage motif of D symmetry and an unprecedented triply interlocked structure of C symmetry. While the former structure features a linear arrangement of four Pd(II) centers, separated by three mechanically linked pockets, the new motif has a staggered shape.
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- - The study focuses on embedding fullerenes into a chiral environment to create unique materials with applications in chiroptical technology and enantioselective catalysts, as well as understanding chirality-induced spin selectivity (CISS).
- - Researchers designed a chiral Pd2L4 capsule using a special 'ribbon-shaped' ligand derived from Tröger's base naphthalimide, which offers a compact structure with a significant inner cavity for hosting fullerenes.
- - The binding of fullerenes like C60, C70, and corannulenes in acetonitrile results in measurable changes in their optical properties, demonstrating the induction of circular dichroism (CD) that was confirmed through X-ray
Article Synopsis
- Shvo's catalyst has been used widely in chemical reactions but lacked modifications for solubility in polar solvents until recently.
- This study presents the simple synthesis of a disulfonate version of Shvo's catalyst, enabling the (de-)hydrogenation of aldehydes and ketones in water.
- The research also demonstrates a method for recycling the catalyst effectively.
A family of Pd cages prepared from ligands based on an axially chiral diamino-[1,1'-biazulene] motif (serving as a unique azulene-based surrogate of the ubiquitous BINOL moiety) is reported. We show that preparing a cage starting from the racemate of a shorter bis-monodentate ligand derivative, equipped with pyridine donor groups, leads to integrative ("social") chiral self-sorting, exclusively yielding the product, but only in a selection of solvents. This phenomenon is driven by individual solvent molecules acting as hydrogen bonding tethers between the amino groups of neighboring ligands, thereby locking the final coordination cage in a single isomeric form.
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