SEARCH
You are in browse mode. You must login to use MEMORY

   Log in to start

level: Level 5

Questions and Answers List

level questions: Level 5

QuestionAnswer
• Are formed by crystallization of the host molecules, the guest component usually limited to long, unbranched straight chain compoundsChannel Types
Applications of Channel Types• Seperation of isomers • In analysis of dermatological creams
• Compounds such as clays, montmorillonite (constituent of bentonite), can entrap hydrocarbons, alcohols and glycols • They form alternate monomolecular (monoatomic) layers of guest and host • Their uses are currently quite limited; however, these may be useful for catalysis on account of a larger surface areaLayer Type
• Layers with gapsHost
• Entrapped in gapsGuest
Examples of Host and GuestHost: Clays, Bentonite, Montmorillonite Guest: Hydrocarbons, alcohols, glycols
What is the use of Host and Guest?• Used as a catalyst due to their large surface area
• During crystallization, some compounds (host) form cage like structure in which coordinating compound (guest) is entrapped.Clathrates
Clathrates examplesWarfarin sodium
• Hydroquinone form cage with hydrogen bonds and hole have diameter of 4.2A This can entrap what?methanol, carbon dioxide, hydrochloric acid
Application of Clathrates• Synthetic metalo-alumino silicates act as molecular sieves • The pores store volatile gases and toxic substances • The entrapped molecule can be removes by physical process
• Single guest molecule entrapped by single host moleculeMono Molecular Inclusion Complex
• Are cyclic oligosaccharides containing minimum of 6 D-gluco pyranose units attached by alpha-1,4 linkagesHOST-Cyclodextrins
Mono Molecular Inclusion Complex Applications• Enchanced Solubility • Enchanced Dissolution • Enchanced Stability • Sustained Release