A spherand is a type of compound that can envelop a guest cation, anion, or neutral molecule within its structure. It is characterized by architecturally interesting arrangements of nitrogen …

Cross-fertilisation between the crown ethers (or, more generally, corands), cryptands, spherands and podands has produced an enormous range of hybrid hosts such as cryptaspherands and …

2012年3月15日 · Examples of spherand and cryptand derivatives, including “intermediate” ligand species of the hemispherand and cryptaspherands type, as well as chromoionophoric …

We have given the family name, spherand, to completely preorganized ligand systems, and the name, spheraplex, to their complexes, which like 7, are capsular [24]. The syntheses and …

Donald J. Cram, 1987 Nobel Laureate, was the creator of the family of hosts that he named spherands. The spherand story began shortly after the genesis of supramolecular chemistry, …

A macrocyclic ligand consisting of meta -bridged phenol groups. Spherands are complex cryptands, having an almost spherical structure, and are able to form complexes by …

A DFT study of spherands containing five anisyl groups — Highly preorganized to bind the alkali metal. Canadian Journal of Chemistry 2006 , 84 (8) , 1045-1049.

In 1979 Cram reported the synthesis of a novel class of macrocyclic host molecules composed of anisyl units that have rigid preorganized cavities. These so-called spherands, the prototype of …

A new series of ligands called spherands are similar to the crowns and cryptands. However, the cavity formed by the oxygen shell can be occupied only by spherical entities such as single …

In host-guest chemistry, two principles are of central importance: (1) preorganization, i.e., the host must have binding sites that are properly arranged for complexation and are otherwise not …