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Changes of the molecular arrangenemt that can be induced by means of the LB technique in the multilayers of a disc-shaped multialkynyl amphiphile are monitored by means of small angle X-ray diffraction. Studies of the monolayers at the air-water interface reveal "edge-on" orientation of the discs. Specific effects of the counter- ions (Na+, Cd²+, Pb²+, and Ba²+) and sub-solution pH on the monolayer collapse pressure, transfer efficiency and molecular order in the multilayers are found. A correlation between the monolayer properties and the ability for formation of periodic discotic structures in the presence of divalent counterions is established. The discotic molecules retain their "edge-on" arrangement in the highly compressed transferred films with slight irregular interdigtation of the flexible wings and inclination to the substrate normal. The tilt and the inter- digitation are reduced when the discotic monolayers are deposited in alternating LB films with barium arachidate spacer layers.
Study of crosslinking process in fluorinated poly(imide-amide)s containing pendant cyano groups
(1994)
Study of crosslinking process in fluorinated poly(imide-amide)s containing pendant cyano groups
(1994)
Rapid recovery of aphasia and deep dyslexia after extensive left-hemisphere damage in childhood
(1994)
Pre-solid varieties
(1994)
Hyperassociative semigroups
(1994)
SBS-Phase Conjugation for Thermal Lens Compensation in 100 Watt Average Power Solid-State Lasers
(1994)
German
(1994)
Three-dimensional organization of endoplasmatic reticulum in the ventral photoreceptors of Limulus
(1994)
Kafka and Kabbalah
(1994)
Fuzzy real numbers
(1994)
Amphiphilic disc-shaped penta-alkynes were studied with regard to their molecular organization in Langmuir-Blod- gett (LB) mono- and multilayers. It was found that each compound investigated forms edge-on arranged stable monolayers at the air-water interface. LB-multilayers derived from fivefold pentyl-substituted pentaynes are characterized by an edge-on ordering of the molecules within Y-type bilayers. One of these compounds, containing a hydoxy substituent as hydrophilic head group, is exemplified and two possible rectangular molecular assemblies perpendicular to the substrate, each with a columnar in-plane packing, will be discussed as a result of molecular modelling. Based on the experimental results, hexagonal layer packing in the LB-film of a disc-shaped penta-alkynyl carboxylic acid without lateral substituents proved to be possible, which, furthermore, could be confirmed by molecular mechanics simulation.
Conformational states and substates of cytochrome P450cam - insight in protein dynamics and folding
(1994)
Localization of carbonic-anhydrase in the salivary-glands of the cockroach, Periplaneta americana
(1994)
Maintaining excellence : cognitive-motor performance in pianists differing in age and skill level
(1994)
Ab-initio investigation of the vibrational structure of absorption and emission spectra of FCO
(1994)