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Different electro-optic polymer systems are analyzed with respect to their electro-optic activity, glass transition temperature (Tg) and photodefinable properties. The polymers tested are polysulfone (PS) and polycarbonate (PC). The... more
Different electro-optic polymer systems are analyzed with respect to their electro-optic activity, glass transition temperature (Tg) and photodefinable properties. The polymers tested are polysulfone (PS) and polycarbonate (PC). The electro-optic chromophore, tricyanovinylidenediphenylaminobenzene (TCVDPA),which was reported to have a highest photochemical stability [1] has been employed in the current work. Modified TCVDPA with bulky side groups has been synthesized, and a
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Fluorescent self-assembled monolayers (SAMs) on glass surfaces are discussed as new sensing materials for metal ions and inorganic anions. The sensing SAMs are created by sequential deposition of two building blocks, a fluorophore and a... more
Fluorescent self-assembled monolayers (SAMs) on glass surfaces are discussed as new sensing materials for metal ions and inorganic anions. The sensing SAMs are created by sequential deposition of two building blocks, a fluorophore and a ligand molecule onto an amino terminated SAM on glass slides. A large number of different systems can be fabricated by combinatorial techniques and parallel synthesis.
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Research Interests: Chemistry, Organic Chemistry, Medicine, Circular Dichroism, Amines, and 15 moreNanostructures, Peptides, Hydrogen Bond, Amino Acids, Hydrogen Bonding, Phenols, Functional Group, Amino Acid Profile, CARBOHYDRATES, Molecular Conformation, Barbituric Acid, Barbiturates, Calixarenes, cyanuric acid, and Pharmacology and pharmaceutical sciences
Research Interests: Materials Science, Quantum Chemistry, Supramolecular Chemistry, Self Assembly, Supramolecular self-assembly, and 11 moreNanotechnology, Multidisciplinary, Ultra High Vacuum Systems, Adsorption, Nano, Scanning tunneling microscopy, Nanostructure, Hydrogen Bond, Elastic Scattering, High Resolution, and building block
Research Interests: Materials Science, Supramolecular Chemistry, Self Assembly, Functional Materials, Nanotechnology, and 14 moreAtomic Force Microscopy, Medicine, Multidisciplinary, Scanning tunneling microscopy, Graphite, Gold, Hydrogen Bond, Hydrogen Bonding, Self Organization, High Resolution, Surface Properties, Langmuir, Highly Oriented Pyrolytic Graphite, and building block
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A novel material for sensing cations in water via fluorescence spectroscopy is presented. The material consists of a glass substrate functionalized with a series of fluorescent self-assembled monolayers. Parallel modification with pairs... more
A novel material for sensing cations in water via fluorescence spectroscopy is presented. The material consists of a glass substrate functionalized with a series of fluorescent self-assembled monolayers. Parallel modification with pairs of fluorophore-binding molecules of monolayers formed on glass yield a library of sensitive glass substrates. Measurements of the changes in fluorescence intensity of the layers upon addition of
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The apparent Ka values of the formation of [1+1] cavitand‐calix[4]arene capsules, based on azinium–sulfonate electrostatic interactions, obtained by direct titration experiments are concentration dependent due to the influence of the... more
The apparent Ka values of the formation of [1+1] cavitand‐calix[4]arene capsules, based on azinium–sulfonate electrostatic interactions, obtained by direct titration experiments are concentration dependent due to the influence of the interaction of the charged capsule components with their initial counterions. 1H NMR and UV dilution experiments, in which this ion‐pairing is excluded, gave Ka‐values larger than 2·106 M–1 in methanol and methanol/water (1:1) for the capsule formation. The capsule encapsulates small guests like methanol, ethanol, etc., as proven by ESI‐MS. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)
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Supramolecular chemistry in water is a constantly growing research area because noncovalent interactions in aqueous media are important for obtaining a better understanding and control of the major processes in nature. This Review offers... more
Supramolecular chemistry in water is a constantly growing research area because noncovalent interactions in aqueous media are important for obtaining a better understanding and control of the major processes in nature. This Review offers an overview of recent advances in the area of water‐soluble synthetic receptors as well as self‐assembly and molecular recognition in water, through consideration of the functionalities that are used to increase the water solubility, as well as the supramolecular interactions and approaches used for effective recognition of a guest and self‐assembly in water. The special features and applications of supramolecular entities in aqueous media are also described.
Research Interests: Chemistry, Water, Supramolecular Chemistry, Self Assembly, Supramolecular self-assembly, and 13 moreNanotechnology, Water Chemistry, Medicine, Molecular Recognition, Non-covalent interactions, CHEMICAL SCIENCES, Water soluble polymers, Imidazoles, Wiley, Aqueous Solution, Aqueous Medium, Piperidines, and binding sites
Research Interests: Engineering, Chemistry, Microfluidics, Fluorescence, Lab On A Chip, and 15 moreNanotechnology, Medicine, Surface Chemistry, Biological Sciences, Optical Sensor, Analytical, CHEMICAL SCIENCES, Microarray Analysis, Miniaturization, Metal ion, Sensor Array, Self Assembled Monolayer, Chemical Sensor, Molecular Structure, and Microfluidic Chip
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Research Interests: Engineering, Microfluidics, Lab On A Chip, Nanotechnology, Medicine, and 14 moreProcess Engineering, High throughput screening, Throughput, CHEMICAL SCIENCES, Continuous Flow, Very high throughput, Microreactor, Chemical Reaction, Sensitivity and Specificity, Organometallic Compounds, Equipment Design, Organic Chemicals, Molecular Structure, and Microfluidic Analytical Techniques
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Various calix[4]arene and resorc[4]arene ionic compounds substituted by cobalt bis(dicarbollide) anions (1) have been prepared for the first time. From tBu‐calix[4]arene (A) the complete series of mono‐, di‐, tri‐ and tetrasubstituted... more
Various calix[4]arene and resorc[4]arene ionic compounds substituted by cobalt bis(dicarbollide) anions (1) have been prepared for the first time. From tBu‐calix[4]arene (A) the complete series of mono‐, di‐, tri‐ and tetrasubstituted derivatives bearing one to four cluster anions on the lower rim (3–6) have been obtained in the form of their alkali‐metal salts by O‐alkylation with the 1‐dioxane derivative [8‐O(CH2CH2)2O(+)‐1,2‐C2B9H10)‐(1',2'‐C2B9H11)‐3,3'‐Co] (2), all of which are syn or cone isomers. In contrast, disubstitution of the dipropyl ether of tBu‐calix[4]arene (B) led to a mixture of the cone and 1,3‐alternate conformers 7a and 7b, respectively. Starting from tetrapropoxy‐calix[4]arene functionalised at the upper rim by carboxylic acid groups in distal positions (C) and an amino‐bridged derivative [8,8'‐μ‐H2N<(1,2‐C2B9H10)2‐3,3'‐Co] (8), calix[4]arene 9, disubstituted at the upper rim, was obtained as the main product along with the monosubstitute...
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Die Einführung von Dialkylsulfidseitenketten in Metallodendrimere ist eine einfache Strategie für deren Einbau in eine Decanthiolmonoschicht, die zuvor durch Selbstorganisation auf einer Goldoberfläche gebildet wurde. Über den Sulfidanker... more
Die Einführung von Dialkylsulfidseitenketten in Metallodendrimere ist eine einfache Strategie für deren Einbau in eine Decanthiolmonoschicht, die zuvor durch Selbstorganisation auf einer Goldoberfläche gebildet wurde. Über den Sulfidanker kann das Dendrimer in ...
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Different orientations of the guest in the cavity of a carcerand lead to a new type of stereoisomerism, “carceroisomerism”. The structure of the host–guest compound (which is shown on the cover of this issue) and its dynamic behavior was... more
Different orientations of the guest in the cavity of a carcerand lead to a new type of stereoisomerism, “carceroisomerism”. The structure of the host–guest compound (which is shown on the cover of this issue) and its dynamic behavior was studied in detail by NMR methods. Such compounds could perhaps find application as molecular switches for electronic devices.
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The incorporation of dialkyl sulfide side chains in metallodendrimers is a simple method for their insertion into a monolayer of decanethiol formed by self-assembly on a gold surface. The dendrimer binds through the sulfide group to a... more
The incorporation of dialkyl sulfide side chains in metallodendrimers is a simple method for their insertion into a monolayer of decanethiol formed by self-assembly on a gold surface. The dendrimer binds through the sulfide group to a defect in the monolayer on the gold surface (see picture). The surface concentration of the isolated dendrimer adsorbate can be regulated by the adsorption time (for example, 55 adsorbates on a surface of 200x200 nm(2) after 20 h).
Research Interests: Chemistry, Self Assembly, Medicine, Adsorption, CHEMICAL SCIENCES, and 4 moreMonolayer, Molecule, Dendrimer, and Sulfide
A continuous flow micro total analysis system (micro-TAS) consisting of an on-chip microfluidic device connected to a matrix assisted laser desorption ionization [MALDI] time-of-flight [TOF] mass spectrometer (MS) as an analytical... more
A continuous flow micro total analysis system (micro-TAS) consisting of an on-chip microfluidic device connected to a matrix assisted laser desorption ionization [MALDI] time-of-flight [TOF] mass spectrometer (MS) as an analytical screening system is presented. Reaction microchannels and inlet/outlet reservoirs were fabricated by powderblasting on glass wafers that were then bonded to silicon substrates. The novel lab-on-a-chip was realized by integrating the microdevice with a MALDI-TOFMS standard sample plate used as carrier to get the microfluidic device in the MALDI instrument. A novel pressure-driven pumping mechanism using the vacuum of the instrument as a driving force induces flow in the reaction microchannel in a self-activating way. Organic syntheses as well as biochemical reactions are carried out entirely inside the MALDI-MS ionization vacuum chamber and analyzed on-line by MALDI-TOFMS in real time. The effectiveness of the micro-TAS system has been successfully demonstrated with several examples of (bio)chemical reactions.