What is meant by Cryptand?
Cryptands are a family of synthetic bicyclic and polycyclic multidentate ligands for a variety of cations. The term cryptand implies that this ligand binds substrates in a crypt, interring the guest as in a burial.
What are Spherands?
Spherands are molecules that were designed to include a cation within a ‘spherical’ array of Lewis basic donor groups.
Who discovered Cryptand?
2]cryptand, Jean-Marie Lehn shared the Nobel Prize in Chemistry. The compound was originally prepared starting with the diacylation of the diamine-diether: [CH2OCH2CH2NH2]2 + [CH2OCH2COCl]2 → [CH2OCH2CH2NHC(O)CH2]2 + 2 HCl. The resulting macrocyclic diamide is reduced by lithium aluminium hydride.
What is lariat ether?
Lariat ethers are macrocyclic (crown ethers) that have one or more sidearms appended to the ring. The sidearms usually contain Lewis basic donor groups when cation binding properties are desired. If lipophilic is enough, these lariat ethers self-assemble into micelles, niosomes, or vesicles.
What type of bonding exists in Supramolecules?
Whereas traditional chemistry concentrates on the covalent bond, supramolecular chemistry examines the weaker and reversible non-covalent interactions between molecules. These forces include hydrogen bonding, metal coordination, hydrophobic forces, van der Waals forces, pi–pi interactions and electrostatic effects.
What are crown ethers and Cryptates?
Crown ethers and cryptands are organic compounds. The key difference between crown ethers and cryptands is that crown ethers are cyclic structures containing ether groups whereas cryptands are either cyclic or non-cyclic structures containing ether groups and nitrogen atoms.
What is Cryptate effect?
When the ‘cryptate effect’ is defined as the increase in complex stability that occurs when a cryptand ligand is produced by simple ring closure from a parent macrocycle with appropriate pendant chelating substituents, then it is demonstrated that, in the system studied, the cryptate effect is predominantly an enthalpy …
What are the intermolecular forces in Supramolecules?
NON-COVALENT intermolecular forces include electrostatic interactions, ion-dipole interaction, dipole-dipole interaction including vander Waal’s forces etc.
What does Supramolecules mean?
Definition of supramolecular : more complex than a molecule also : composed of many molecules.
What is the meaning of crown ether?
Crown ethers are cyclic chemical compounds that consist of a ring containing several ether groups. Crown ethers strongly bind certain cations, forming complexes. The oxygen atoms are well situated to coordinate with a cation located at the interior of the ring, whereas the exterior of the ring is hydrophobic.
Which is the best definition of the word pod?
1 : a bit socket in a brace. 2 : a straight groove or channel in the barrel of an auger. pod. noun (2) Definition of pod (Entry 2 of 6) 1 : a dry dehiscent pericarp or fruit that is composed of one or more carpels especially : legume.
What do you mean by the word culture?
“By culture we mean all those historically created designs for living, explicit and implicit, rational, irrational, and nonrational, which exist at any given time as potential guides for the behavior of men.” Kroeber, A.L., & Kluckhohn, C. (1952).
How is culture defined in Intercultural Studies project?
CARLA’s Definition. For the purposes of the Intercultural Studies Project, culture is defined as the shared patterns of behaviors and interactions, cognitive constructs, and affective understanding that are learned through a process of socialization. These shared patterns identify the members of a culture group while also distinguishing those
Which is the best description of a culture?
Linton, R. (1945). The Cultural Background of Personality. New York. “A culture is a configuration of learned behaviors and results of behavior whose component elements are shared and transmitted by the members of a particular society” (p. 32). Parson, T. (1949).