Applications of microscopy and small angle scattering techniques for the characterisation of supramolecular gels

• Connor R. M. MacDonald and
• Emily R. Draper

Beilstein J. Org. Chem. 2024, 20, 2608–2634, doi:10.3762/bjoc.20.220

• use of fluorescence probes should be used in tandem with CLSM. For example, Raeburn et al. showed that the addition of molecular rotors and fluorescent dyes affects the bulk network of self-assembled materials using rheology. The co-packing was observed to alter rheological properties of the materials

A heteroditopic macrocycle as organocatalytic nanoreactor for pyrroloacridinone synthesis in water

• Piyali Sarkar,
• Sayan Sarkar and
• Pradyut Ghosh

Beilstein J. Org. Chem. 2019, 15, 1505–1514, doi:10.3762/bjoc.15.152

• supramolecular assemblies like molecular rotors (pseudorotaxane, rotaxane, catenane), molecular switches, molecular shuttles, etc. [32][33][34][35][36][37][38][39][40][41][42][43]. Furthermore, macrocycles have been applied in the area of ion–ion pair recognition and heterometallic complex formation [44][45][46

• ][47][48][49][50]. The multifunctional macrocycle BATA-MC (Figure 1) has been successfully applied as a wheel in the molecular rotors fields [51]. Considering its multiple binding sites (π-interactions, H-bonding site, cavity), we investigated the catalytic activity of this macrocycle. BATA-MC was

Synthesis of dipolar molecular rotors as linkers for metal-organic frameworks

• Sebastian Hamer,
• Fynn Röhricht,
• Marius Jakoby,
• Ian A. Howard,
• Xianghui Zhang,
• Christian Näther and
• Rainer Herges

Beilstein J. Org. Chem. 2019, 15, 1331–1338, doi:10.3762/bjoc.15.132

• dicarboxylic acid-substituted dipolar molecular rotors for the use as linker molecules in metal-organic frameworks (MOFs). The rotor molecules exhibit very low rotational barriers and decent to very high permanent, charge free dipole moments, as shown by density functional theory calculations on the isolated

• macroscopic world, as well as at the molecular level. Molecular rotors have been thoroughly investigated as basic building blocks in molecular machines and other molecular architectures [1][2]. Equally interesting is the collective behaviour of ensembles of molecular rotors in two and three dimensions, i.e

• also been pursued to implement molecular rotors in the solid state. Crystals of linear molecular rotors [8][9][10][11][12][13], caged rotor crystals and gyroscope like molecules [14][15][16][17][18][19][20] as well as organosilicates [21] and metal-organic frameworks [22][23][24][25] containing

Asymmetric 1,4-bis(ethynyl)bicyclo[2.2.2]octane rotators via monocarbinol functionalization. Ready access to polyrotors

• Cyprien Lemouchi and
• Patrick Batail

Beilstein J. Org. Chem. 2015, 11, 1881–1885, doi:10.3762/bjoc.11.202

• functional molecular rotors. Their synthesis uses carbinol, 2-methyl-3-butyn-2-ol, as a protecting group because of its polar character and its ability to sustain orthogonal functionalization with the further advantage of being readily removed. The synthesis in good yields of unprecedented asymmetric rotors

• and polyrotors demonstrates the efficiency of this strategy. Keywords: bridging ligands; molecular rotors; polyrotors; Findings Synthesis-informed design [1] of rotors is essential to the development of molecular machines [2][3][4][5]. Recent advances in the chemistry of functional rotors with a 1,4