Molecular Boxes Based on Calix[4]arene Double Rosettes

Abstract

The loss of anions takes place inside the mass spectrometer, generating the multiply charged ions needed for detection and calculation of the molecular weight. ["] Moleculqr mechanics were performed on Go -C3. The square-planar coordination environment of the Pd centers is well preserved. It is clear that after the second generation the structure of the dendrimer becomes quite entangled (Fig. 2). 5 nm Fig 2. Optimircd structures of G,, G ,We have shown that organometallic structures of nanometer dimensions can now be constructed in a very simple and controlled way. This method of controlled assembly provides a new and versatile tool for dendrimer synthesis. The method allows large variation in the metal in each generation, the coordinating ligands, and the structure of the nucleus. Received. December 29, 1995 [Z86901E] German version Arigeii . C/iern.

Artificial Molecular Rotors

“…Reinhoudt and co-workers [772][773][774][775][776] have similarly investigated rotational phenomena in self-assembled molecular cage structures ( Figure 86) composed of cyanuric and barbituric acid derivatives and in complexes with melamine and a calixarene (the hub). They began with calix [4]arene 212a containing melamine substituents and self-assembled the structures in a variety of solvents with 2 equiv of the barbiturates (diethylbarbituric acid or DEB) or cyanurates (cyanuric acid or CYA) to give complexes containing three units of the calixarene and six units of the acids: (212a) 3 (DEB) 6 and (212a) 3 (CYA) 6 .…”

Complete asymmetric induction of supramolecular chirality in a hydrogen-bonded assembly

“…1) 21,22 . In the absence of any other source of chirality, this isomer exists as a racemic mixture of the M-and P-enantiomers.…”

A Combinatorial Approach to Synthetic Receptors

“…[22,23] The assemblies spontaneously form in apolar solvents upon mixing the molecular components in a 1:2 ratio. They are thermodynamically stable even at 0.1 mM concentration in chloroform as a result of the cooperative formation of 36 hydrogen bonds.…”