Poly(1-vinylimidazole) with a trimethoxysilyl terminal group (Imn) was synthesized by telomerization of 1-vinylimidazole. The degree polymerization (n) determined 1H NMR to be 18. Im18 reactive silane grafted directly onto nanosize magnetic particles (maghemite, γ-Fe2O3) through siloxane bonds produce polymer-grafted nanocomposite (Mag-Im18). amount polymer anchored on the particle estimated elemental analysis 5 wt %. surface coverage imidazolyl groups 0.44 mmol g-1. A stable Mag-Im18...

Abstract A new strategy is described for generating strong circularly polarized luminescence with highly tunable emission bands through chiral induction in nonchiral, totally organic, low‐molecular‐weight fluorescent dyes by nanotemplate systems. Our approach allows the first systematic investigation to clarify correlation between circular dichroism and intensities. As a result, dilute solution system highest intensity achieved date dissymmetry factor of over 0.1 was identified.

Covalent organic frameworks (COFs), as an emerging class of porous crystalline materials constructed by covalent links between the building monomers, have gained tremendous attention. Over past 15 years, COFs made rapid progress and substantial development in chemistry fields. However, synthesis has been dominated solvothermal methods for a long time it usually involves high temperature, pressure toxic solvents, which created many challenges environmental considerations. Recently,...

A new organogelator based on a salicylideneaniline derivative with cholesterol moieties was synthesized, and it proposed that could gelate various organic solvents, such as 1-butanol, 1-octanol, butyl acetate, tetrachloromethane, benzene, toluene through combination gelation test. From the results of analysis by UV/Vis absorption, circular dichroism (CD), X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission (TEM) studies semiempirical (AM1) calculations, we believed...

A new poly(ionic liquid)-grafted silica stationary phase was prepared and characterized. It then applied for multi-mode chromatographies, including ion-exchange, reversed-phase, hydrophilic interaction liquid chromatographies the effective separation of anions, hydrophobic compounds, small polar molecules, respectively.

Enantioselective discrimination of chiral molecules is essential in chemistry, biology, and medical science due to the configuration-dependent activities enantiomers. Therefore, identifying a specific amino acid distinguishing it from its enantiomer by using nanomaterials with outstanding performance are great significance. Herein, blue- green-emitting silicon nanoparticles named bSiNPs gSiNPs, respectively, excellent water solubility, salt resistance, pH stability, photobleaching...

Abstract Double-chain alkyl amphiphiles with oligo-l-glutamic acid-head group were prepared. These compounds dispersed in water at pH 8 to 9 form bilayer aggregates, which helical and hollow structures contained. New CD bands observed the solution.

A new helical aromatic oligoamide foldamer, bearing triethyleneglycol side chains for solubility in a broad range of media, was prepared. The stability the conformation assessed various solvents and shown to vary greatly unexpectedly. Stability remarkably enhanced methanol–water mixtures.

Enantioselective recognition of amino acids was achieved by using a highly ordered chiral assembly achiral porphyrin on molecular gel. Exceptionally high enantioselectivity observed for histidine derivatives monitoring the CD patterns and fluorescence quenching, KSV (L): 26.3 × 103 M−1; KSV(D)-enantiomer: 7.03 M−1.

To increase the electrical conductivity of organic transparent electrodes, sulfated cellulose (CS) with a β(1 → 4)-linked glucopyranose chain was used as dopant for PEDOT system.

High thermal conductivity, high strength and non-flammability have successfully been achieved concurrently for the first time in Mg–4.5Al–2.5Ca, Mg–5Al–3Ca, Mg–6Al–4Ca, Mg–4Al–2Ca–0.03Be (at%) alloys, which are produced by hot extrusion of heat-treated cast alloys. These alloys consist α-Mg, C36, C14 C15 compounds, exhibit a conductivity 111–119 Wm−1K−1, ignition temperature 1343–1408 K tensile yield 318–363 MPa.

A double-chain alkyl lipid with an isoquinoline-containing headgroup was derived from l-glutamide. This worked as organogelator in benzene, cyclohexane, a cyclohexanes−ethanol mixture, and so forth. Transmission electron microscope observation showed that the gelation brought about through formation of fibrillar network, circular dichroism (CD) spectra indicate aggregates were based on highly ordered structures. The critical aggregation concentration (cac) estimated by detecting enhancement...

Microfibrous self-aggregation of chromophoric groups porphyrin and/or pyrene substituted by didodecyl l-glutamic acid in organic media is confirmed transmission electron microscopic (TEM) observation. Chromophoric probes and moieties enable evaluation their assembling behavior photophysically through UV−vis, circular dichroism (CD), fluorescence spectroscopic characterization. This characterization was able to compensate the lack TEM observation for aggregation even at a low concentration...

Ab initio SCF/MP2 potentials are calculated on benzene–methane and benzene–benzene complexes. Although no energy stabilization appears at the Hartree–Fock level, a small but non-negligible in is observed MP2 level both complexes, indicating importance of dispersion energy. Besides energy, electrostatic interaction plays some role determining relative stabilities several cases. The most stable structure complex adopts C3v symmetry with methane lying benzene C6 axis one hydrogen atom pointing...

A templating method is used to create conductive polymers that have a helical superstructure. The driving force an electrostatic interaction between the negative charge in synthetic lipid and cationic generated during oxidative electrochemical polymerization of ethylenedioxythiophene (EDOT) pyrrole (see picture; CV=cyclic voltammetry). Supporting information for this article available on WWW under http://www.wiley-vch.de/contents/jc_2002/2004/z51749_s.pdf or from author. Please note:...

A series of helically folded oligoamides 8-amino-2-quinoline carboxylic acid possessing 6, 7, 8, 9, 10 or 16 units are prepared following convergent synthetic schemes. The right-handed (P) and the left-handed (M) helical conformers these oligomers undergo an exchange slow enough to allow their chromatographic separation on a chiral stationary phase. Thus, M conformer is isolated for each its racemization in hexane/CHCl(3) solutions monitored at various temperatures using HPLC. kinetics...

Oligoamide sequences comprised of both 8-amino-2-quinolinecarboxylic acid "Q" and 6-aminomethyl-2-pyridinecarboxylic "P" have been synthesized. It was found that the aliphatic amine P greatly facilitates amide couplings, as opposed to aromatic Q, which enabled us prepare having up 40 units. The conformation conformational stability these oligomers were characterized in solid state using X-ray crystallography solution NMR various chromatographic techniques. Q(n) adopt very stable helically...

Herein, we report a new 'programmable' responsive shaping behavior induced by the visible multi-dimensional gradient of magnetic nanoparticles (MNP): materials exhibit different local curvatures and sequence shapes during process; curvature are accurately defined 'programmed instructions'—MNP gradients in materials.

A new strategy for the design of a chromatographic stationary phase via simple modifications counter anions in poly(ionic liquid)-grafted silica based on ionic self-assembly technology is proposed. The with methyl orange dye as exhibits ultra-high selectivity towards shape-constrained isomers.

Polymerizable ionic liquid monomer pairs were designed and copolymerized on silica as a new strategy to prepare multifunctional hybrid materials in hydrophobic hydrophilic interaction chromatographies with enhancements of selectivity stability.