Materials Literature
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The novel halide-centered Ag(I)8 cubic clusters containing diethyl diselenophosphato ligands are prepared and their solid state structures, a discrete unit or a one-dimensional chain, are dictated by the counter anions.
Decahydronaphthalene (decalin) exists in two stereoisomeric molecular configurations, a cis and a trans configuration. The cis and trans isomers have different physical properties. In this work, a study of the stereoisomeric effect on the dynamic viscosity (and density) versus pressure and temperature has been carried…
Structural modification of the important tetraaza macrocyclic ligands such as cyclen and cyclam involving ethylene and trimethylene bridging of the non-adjacent nitrogens represents a new class of macrobicyclic ligands, so-called bowl-adamanzanes. The molecular topology and size confer special properties to these amin…
The observation of overtones and combinations in the SERRS spectra of single molecules dispersed in Langmuir-Blodgett monolayers is confirmed for a family of molecules. The detection of fundamentals, combinations, and overtones in single-molecule spectra of a series of perylenetetracarboxylic diimides (PTCD) is achiev…
A low-temperature gas reaction was used to successfully synthesize TiS2 nanotubes with an outer diameter of approximately 20 nm, an inner diameter of approximately 10 nm, an interlayer spacing of approximately 0.57 nm, and an average length of 2-5 microm.
A novel porphyrinic receptor 1 in which two zinc porphyrins are bridged by two diarylurea linkers was developed for recognition of a viologen derivative (hexyl viologen, HV). The electronic absorption spectra as well as the 1H NMR experiments revealed that the HV molecule was bound to the cleft in 1 mainly through car…
Manganese(II) complexes of mononegative pentadentate N4O ligands [Mn2(mgbpen)2(H2O)2](ClO4)2 (1), (mgbpen− = N-methyl-N′-glycyl-N,N′-bis(2-pyridylmethyl)ethane-1,2-diamine) and [Mn2(bzgbpen)2(H2O)2](ClO4)2 (2), (bzgbpen− = N-benzyl-N′-glycyl-N,N′-bis(2-pyridylmethyl)ethane-1,2-diamine) have been prepared. The crystal…
We report on the synthesis of a series of second-generation hyperbranched polyesters with a variable composition of alkyl-terminated groups. We observed that the chemical modification of the hyperbranched cores by substituting a controlled fraction of the terminal hydroxyl groups with hydrophobic alkyl chains is an ef…
Complexation of single-wall carbon nanotubes with 12-membered cyclodextrins enables not only their solubilization in water but also their partial separation with respect to diameters and determination of the number of nanotube types on the basis of NMR spectra.
Abstract A series of nylons with long alkane segments between amide groups were synthesized by using hexadecane diacid and various diamines, and the resulting polyamides were characterized comprehensively. It was shown that the molecular weights of nylons 6 16, 8 16, 10 16, and 12 16 in our studies exceed 1.1 × 10 4 ,…
Abstract The evaluation of heterogeneous polymeric species by a selective, dual detector size‐exclusion chromatography setup can provide accurate results on the incorporation of specific functional groups in copolymers as a function of the molar mass distribution. However, when non‐UV‐absorbing species are used in cop…
Abstract Novel ladderlike polysilsesquioxanes that contain phosphorus were successfully synthesized by the sol–gel method. The polysilsesquioxanes were characterized by Fourier transform infrared spectroscopy, 29 Si NMR, and X‐ray diffraction. The characterizations demonstrated that the polymer possesses a typical lad…
The synthesis of several new bismuth porphyrin complexes Bi(por)(X) containing the tpp or tpClpp (tpClpp = 5,10,15,20-tetra-p-chlorophenylporphyrin) porphyrin ligand and anions X = NO3, Cl, Br, I are described. Molecular structures reported for Bi(tpClpp)(X) for X = Cl, Br show that the complexes crystallise as centro…
Abstract This work involves the development of novel glass fiber–reinforced composite materials containing a commercially available epoxy resin, a phosphate‐based intumescent, and inherently flame‐retardant cellulosic (Visil, Sateri) and phenol–formaldehyde (Kynol) fibers. The intumescent and flame‐retardant fiber com…
2-Oxepane-1,5-dione (OPD) has been synthesized by the Baeyer−Villiger oxidation of 1,4-cyclohexanedione and copolymerized with ε-caprolactone. This random copolymerization has been initiated by different metal derivatives, i.e., tin octanoate, dibutyltin dimethoxide, and aluminum isopropoxide. Dibutyltin dimethoxide i…
Abstract Silicone rubber as a valuable biomaterial is widely used in medical applications, but its surface properties and low wettability make serious problems in long‐term implants. This work was undertaken to evaluate the biocompatibility of modified silicone rubber using two different techniques. A blend of poly(ac…
${\mathrm{G}\mathrm{d}}_{5}{\mathrm{S}\mathrm{n}}_{4}$ exhibits a giant magnetocaloric effect comparable to that reported in the ${\mathrm{G}\mathrm{d}}_{5}(\mathrm{S}\mathrm{i},\mathrm{G}\mathrm{e}{)}_{4}$ system. The giant magnetocaloric effect is associated with a first-order change that occurs at $\ensuremath{\sim…
Powder and single-crystal X-ray diffraction, combined with MAS NMR measurements, has been used to study the thermal expansion of siliceous zeolite ferrierite as it approaches a second-order displacive phase transition from a low-symmetry (Pnnm) to a high-symmetry (Immm) structure. Below the transition temperature, fer…
Information about the partial structure factors of densified GeO2 glass has been obtained from neutron and x-ray diffraction measurements. Densification causes a reduction in the length scale of the intermediate range order (IRO). The difference structure factors obtained by combining the x-ray and neutron data so as…
We report the optical properties of three dioxythiophene-based conjugated polymers: poly(3,4-ethylenedioxythiophene) poly(3,4-propylenedioxythiophene), and poly(3,4-(2,2-dimethylpropylenedioxy)thiophene). Films of ca. 200 nm thickness of these polymers were prepared on indium-tin-oxide coated glass substrates using a…