Molecular complexes of acetylene alcohols with n- and χ-donors

Crystalline Inclusion Compounds of a Palladacyclic Tetraol Host Featuring o‐Carborane Units

“…Furthermore, decoration of the host with functional groups capable of hydrogen bonding often improves the inclusion properties. Wheel‐and‐axle molecular geometries (Figure ), first reported by Toda, correspond to this line of reasoning , . Such molecular geometries are produced by connecting two bulky propeller‐shaped groups by a long linker (for short linkers, they are known as the dumbbell[2a] type).…”

“…[2a], , When the axle groups are decorated with hydrogen‐bonding functional groups such as alcohols, they are termed “ wheel‐and‐axle” diols. [4a] A considerable innovation in this field was the introduction of a metal in these wheel‐and‐axle compounds, either at the wheels or at the axle (top of Figure ) . For example, the metal can be part of the axle through classical coordination bonds, as in the series of wheel‐and‐axle metal–organic diols (WAMODs) shown in Figure .…”

2,7-Dimethyl-3,5-octadiyne-2,7-diol dichloromethane solvate: a clathrate comprising hydrogen-bonded supramolecular tunnels containing dichloromethane guest molecules

“…Compound (2) has been used to separate strychnine and sparteine from brucine using a similar method (Segawa, Mori & Toda, 1988). However, in other studies, Toda & Akagi (1968) report that (1) does not appear to participate in similar crystalline clathrate complexation. During the course of work employing 2-methyl-3-butyn-2-ol (3) as an acetylenic coupling reagent, we produced (1) as a highly crystalline by-product.…”

Fabricating organometallic wheel-and-axle compounds for the creation of dynamically porous crystalline materials

“…Although the reliability of the supramolecular ܴ ଶ ଶ ሺ8ሻ dimer is dependent on the presence of competing synthons, 24 the solid state chemistry of carboxylic acids and amides is certainly characterized by such a supramolecular synthon, which have already been used in the fabrication of crystal engineered materials. Furthermore, the insaturation present in 4-amino-cinnamic acid (12) allowed to evaluate the structural and responsivity effects deriving from different degrees of flexibility of the spacer (compare ligand 12 with ligands 13 and 14). Pyridine served to bind Ru, while the carboxylic function was expected to form the supramolecular axle.…”

“…In order to impart a dynamic character to the isolated organometallic materials we directed our attention onto Wheel-And-Axle (WAA) systems. 12 Based on these considerations, we undertook a study aimed at fabricating "inorganic" versions of WAADs. The irregular morphology of these dumbbell shaped building blocks frustrates a close packing in the solid state, thus leading to formation of clathrates.…”