New bifunctional organocatalysts amine-thioureas bearing multiple hydrogen bonding donors were synthesized and applied in catalytic asymmetric Michael addition of acetylacetone to aryl and alkyl nitroolefins. Multiple hydrogen bonding donors play a significant role in accelerating reactions, improving yields and enantioselectivities.

A macroion, having anisotropic surface charge density distribution, shows unique self-assembly behaviour in polar solvents. Regular "blackberry"-like assemblies form in methanol-water mixtures due to counter-ion mediated attraction and the strong contribution of hydrogen bonding. However, rod-like assemblies form in acetone-water mixtures as the charge inhomogeneity effect overcomes the non-dir...

The asymmetric unit of the title salt, C7H7N2 (+)·BF4 (-), comprises two independent but nearly identical formula units. The solid-state structure comprises corrugated layers of cations and anions, formed by C-H⋯F hydrogen bonding, that are approximately parallel to (010). Further C-H⋯F hydrogen bonding consolidates the three-dimensional architecture. The sample was refined as a two-component n...

The fluorescence recognition of octahedral nanocages M-QT1 (M = Co, Zn) and metallotricycle Pd-QD, that are comprised of luminescence active quinoline groups and several kinds of amide groups, on ribonucleosides was investigated. The amide groups located on the opening windows or inner surface of the polyhedra and polygon, respectively, providing special environments for the size or shape-selec...

An oligo(p-phenylenevinylene) capped on one end by a monotopic DAD-type triple hydrogen-bonding module shows distinct optical properties as well as self-organization behavior upon complexation with cyanurates with different numbers of ADA-type triple hydrogen-bonding sites.

Thermodynamically stable phases of sodium amide (NaNH2) at pressures up to 20 GPa have been determined using the ab initio evolutionary structure prediction. We find that the ground-state phase α-NaNH2 (orthorhombic, Fddd) first transforms into β-NaNH2 (orthorhombic, P21212) at 2.2 GPa; then, γ-NaNH2 (monoclinic, C2/c) becomes stable at 9.4 GPa. In addition to strong ionic bonding between Na an...

We report a real-space visualization of the formation of hydrogen bonding in 8-hydroxyquinoline (8-hq) molecular assemblies on a Cu(111) substrate, using noncontact atomic force microscopy (NC-AFM). The atomically resolved molecular structures enable a precise determination of the characteristics of hydrogen bonding networks, including the bonding sites, orientations, and lengths. The observati...

In the title compound, C(18)H(16)BrN(3), mol-ecules are linked into dimers by co-operative inter-molecular N-H⋯N hydrogen bonding. Only one N-H group is involved in hydrogen bonding. The planes of the pyridine and bromo-phenyl rings are twisted by 61.49 (3) and 79.11 (8)°, respectively, from the plane of the central phenyl ring.

Pillar[5]arenes with introverted amino groups were produced through aminolysis. X-ray analysis demonstrated that the intramolecular hydrogen bonding induced the amino group toward the inner space of the cavity. The kinetic studies and molecular modelings revealed that the hydrogen bonding also contributed to the acceleration of the aminolysis through stabilizing the intermediate.

The title compound [systematic name: (R)-(-)-2-acet-oxy-2-phenyl-acetic acid], C10H10O4, is a resolved chiral ester derivative of mandelic acid. The compound contains an acetate group and a carb-oxy-lic acid group, which engage in inter-molecular hydrogen bonding, forming chains extending parallel to [001] with a short donor-acceptor hydrogen-bonding distance of 2.676 (2) Å.