Materials Literature
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Discrete squares and tapes of porphyrins are self-assembled by self-complementary hydrogen bonding between diacetamidopyridyl recognition groups rigidly linked to the chromophore.
Two functionalized bipyrroles, 3,3′,5,5′-tetraethoxycarbonyl-4,4′-dipropyl-2,2′-b ipyrrole 1 and 3,3′,5,5′-tetraethoxycarbonyl-4,4′-diphenyl-2,2′-b ipyrrole 2, are highly luminescent materials at room conditions; they show UV emission at λmax = 416 (1) and 414 nm (2) with quantum yields close to unity in the solid sta…
The cytoplasm contains high concentrations of cosolutes. These cosolutes include macromolecules and small organic molecules called osmolytes. However, most biophysical studies of proteins are conducted in dilute solutions. Two broad classes of models have been used to describe the interaction between osmolytes and pro…
Electroless plating of copper and nickel via a one-step, tin-free activation process was carried out effectively on polyimide (PI, Kapton ® HN) films modified by UV-induced surface graft copolymerization with 1-vinylimidazole (VIDz). The UV-induced surface graft copolymerization of VIDz was carried out on the Ar plasm…
A porphyrin bearing a peripheral enaminoketone function allows the preparation of conjugated dimeric porphyrins linked through metal ions.
Several ferrocenyl-based oligomers with a pendant nitro group have been synthesized and characterized. The crystal structure of the compound (E)-(η5-C5H5)Fe(η5-C5H4)–CHCHC6H4NO2 is described, showing a centrosymmetric arrangement as already proposed by several authors. The nonlinear optical properties of the compounds…
The copper-ion-exchanged ZSM-5 type zeolite, prepared by ion-exchange in an aqueous solution of Cu(CH3COO)2 and evacuation at 873 K, gives a distinctive IR band at 2151 cm−1 due to the adsorbed CO species. More efficient adsorption of N2 was exhibited by this sample, compared with samples prepared by other methods, im…
The objective of this study was to investigate the pharmacokinetics and in vivo anti-tumor effect of recombinant human tumor necrosis factor-alpha (rHuTNF-alpha) encapsulated in poly(methoxypolyethyleneglycol cyanoacrylate-co-n-hexadecyl cyanoacrylate) (PEG-PHDCA) nanoparticles. Our experimental results showed that PE…
The effects of the specimen temperature of low-density polyethylene (LDPE) in O2 plasma treatment were studied to enhance the amount of hydrophilic functional groups introduced and to reduce the aging effect. The specimen temperature was varied from 25°C to 100°C. The smallest water contact angle was obtained with the…
ADVERTISEMENT RETURN TO ISSUECommunication to the...Communication to the EditorNEXTA Study of the Physical Aging in Semicrystalline Poly(ethylene terephthalate) via Differential Scanning CalorimetryJ. Zhao, R. Song, Z. Zhang, X. Linghu, Z. Zheng, and Q. FanView Author Information State Key Laboratory of Polymer Physic…
The photophysical properties of (i) three macrocycles (1–3) of different size, each one incorporating a bis(2,5-dimethylpyrrolo[3,4-d])tetrathiafulvalene (TTFP) and a 1,4-dimethoxybenzene (DMB) electron-donating unit, (ii) the six pseudorotaxanes obtained by threading 1–3 with the electron acceptors dimethyldiazapyren…
The new complexes of formulae PPh4[Cr(dpa)(ox)2] (1), AsPh4[Cr(dpa)(ox)2] (2), Hdpa[Cr(dpa)(ox)2]·4H2O (3), Rad[Cr(dpa)(ox)2]·H2O (4) and Sr[Cr(dpa)(ox)2]2·8H2O (5) [PPh4 = tetraphenylphosphonium cation; AsPh4 = tetraphenylarsonium cation; dpa = 2,2′-dipyridylamine; ox = oxalate dianion; Rad = 2-(4-N-methylpyridinium)…
Fibrous capsule formation around implants can inhibit solute exchange between implantable devices and the circulation. Parylene-n coated polycarbonate disks surrounded with growth factor reduced Matrigel (MG) or several gelatin-based matrices were implanted intramuscularly into rats for 21 or 50 days. MG supplemented…
The new narrow-rim functionalised receptor 5,11,17,23-tetra-tert-butyl-25,26,27,28-tetrakis[2-(diethylcarbamoylmethoxy)ethoxy]calix[4]arene (A4bL4) has been synthesised. NMR spectra show it to adopt a cone conformation in solution with a time-averaged C4v symmetry. A4bL4 reacts with trivalent lanthanide ions in aceton…
Methacrylated hyperbranched poly(amine ester)s as oligomers in radiation curing resins have a lower viscosity and a higher cure speed. Their viscosity was reduced sharply when an amount of a monomer was added or the temperature was increased. Their polymerization rate and final conversion of the double bond differ wit…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTMedium-Dependent Self-Assembly of an Amphiphilic Peptide: Direct Observation of Peptide Phase Domains at the Air−Water InterfaceEvan T. Powers and Jeffery W. KellyView Author Information Department of Chemistry and the Skaggs Institute of Chemical Biology, The Scripps…
Two types of macrocyclic multi-telluranes with hypervalent Te–O apical linkages in the main chain were prepared by the reaction of a telluronium salt or a cationic ditelluroxane with phthalate via [3 + 3] and [2 + 2] assembly, respectively.
Porous silicon is a network of parallel straight mesopores without lateral interconnection. The adsorption isotherm of nitrogen onto porous silicon exhibits a hysteresis loop of type H2 in the IUPAC classification, similar to those observed for highly interconnected mesoporous media. This shows that it is not possible…
Two series of bis[1,2-bis(4-n-alkylphenyl)ethane-1,2-dithiolene]nickel, Cn–Ni (n = 1–12), and bis[1,2-bis(4-n-alkoxyphenyl)ethane-1,2-dithiolene]nickel, CnO–Ni(n = 1–12, 14, 16, 18), have been synthesized. Their mesomorphism, thermochromism, supramolecular structures and π-acceptor property have been investigated by u…
We argue that elastic interactions between ions in different valence states can play an essential role in the stabilization of stripes (or 2D "sheets" ) in doped oxides. These interactions are in general long range and an iso tro pic (attractive in certain directions and repulsive in others). This can naturally give r…