Materials Literature
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Amphiphilic hydrogen bond networks consisting of alkylated melamines and ammonium headgroup-appended cyanuric acids are stably dispersed in water as supramolecular membranes. Electron micrographs of these aqueous dispersions indicated the formation of supramolecular assemblies of mesoscopic dimension. Their aggregate…
Single-component monolayers of dendrimers and two-component monolayers consisting of dendrimers and n -alkanethiols immobilized on Au substrates are described. Single-component monolayers are prepared by exposing an Au substrate to ethanolic solutions of amine- or hydroxy-terminated polyamidoamine (PAMAM) dendrimers.…
The lifetime of image states, which represent a key quantity to probe the coupling of surface electronic states with the solid substrate, have been recently determined for quantum numbers $n\le 6$ on Cu(100) by using time-resolved two-photon photoemission in combination with the coherent excitation of several states (…
The electronic response of a composite consisting of aligned metallic cylinders in vacuum is investigated, on the basis of photonic band structure calculations. The effective long-wavelength dielectric response function is computed, as a function of the filling fraction. A spectral representation of the effective resp…
Heat capacity measurements on the prototypical three-dimensional random-field Ising model compound Fe0.58Zn0.42F2 have been performed in both of the field-cooling (FC) and zero-field-cooling (ZFC) procedures. There is no evidence of hysteresis between the FC and ZFC protocols within the experimental accuracy. The abse…
We describe the fundamental equations for description of electron-photon interactions in insulating nanostructures. Since the theory for the nanostructures are based on the theory for the bulk crystals, we shall describe elements of the theory for the bulk crystals \cite{knox}-\cite{b2} in the first three subsections.…
It is found experimentally that the coexistence region of a vapor-liquid system or a binary mixture is substantially narrowed when the fluid is confined in a aerogel with a high degree of porosity (e.g. of the order of 95% to 99%). A Hamiltonian model for this system has recently been introduced (J.Donley PRE 55:539,…
Polarized attenuated total reflectance (ATR), grazing angle reflection−absorption, and transmission Fourier transform infrared (FT-IR) spectroscopy methods have been used to investigate the orientation of peptide nanotubes in the functionally relevant environment of ordered phospholipid multibilayers. Eight-residue cy…
Relatively monodisperse, highly luminescent zinc blende ZnSe nanocrystals are synthesized in a hexadecylamine/trioctylphosphine coordination solvent. The controlled growth process affords tunable sample sizes. Pure band-edge fluorescence size-tunable between 2.8 and 3.4 eV is obtained at room temperature with quantum…
The novel compound 1,10-diiodophenanthrene (right) is twisted by 68° owing to I–I repulsion. Density functional calculations with basis sets augmented by iodine pseudopotentials have been performed for this compound and for 2,2′diiodobiphenyl and 1,8-diiodonaphthalene, and the distortion of their structures caused by…
A thermally populatedS=3/2 spin state at room temperature is quite unusual for the coordination chemistry of six-coordinate iron(III) ions. For the complex cation [Fe(L-N4Me2Me2)(S2C6H4)]+, the occurrence of a spin crossover between a low-spin state and an intermediate-spin state is established by structural, magnetic…
Analysis of the dihydrofolate reductase (DHFR) complex with folate by two-dimensional heteronuclear (1H-15N) nuclear magnetic relaxation revealed that isolated residues exhibit diverse backbone fluctuations on the nanosecond to picosecond time scale [Epstein, D. M., Benkovic, S. J., and Wright, P. E. (1995) Biochemist…
A number of derivatives of 1,3-dithienylbenzo[ c ]thiophene have been synthesized. The mono- and dicarboxaldehydes have been elaborated to give new vinylenes and cyanovinylenes. β-Dodecyl- and hexyl-substituted analogues have been prepared. Results from cyclic voltammetric investigation as well as fluorescence studies…
Polymerization of two isomeric heterocyclic monomers, 3-methyl-1-vinylpyrazole and 1-allylimidazole, was investigated under pulsed plasma conditions. Large-scale, progressive variations in polymer compositions were observed with sequential changes in the plasma duty cycles employed, all other plasma variables being he…
Pyruvate kinase from rabbit muscle has been cocrystallized as a complex with MgIIATP, oxalate, Mg2+, and either K+ or Na+. Crystals with either Na+ or K+ belong to the space group P2(1)2(1)2(1), and the asymmetric units contain two tetramers. The structures were solved by molecular replacement and refined to 2.1 (K+)…
Potential holographic materials are obtained from the azobenzene-functionalized dendrimers described herein (shown schematically on the right). Even in the largest species presented, which contains up to 32 azobenzene chromophores, each chromophoric unit behaves independently compared to “monomer” model compounds. Dif…
Three neutral π-associated [2]catenanes have been synthesised from the oxidative dimerisation of terminal acetylene-equipped electron-deficient diimides in the presence of an electron-rich dinaptho-crown template (below). The mutual recognition of the complementary donor–acceptor building blocks is revealed in solid-s…
We model an apparent instability seen in recent experiments on current induced step bunching on Si(111) surfaces using a generalized 2D BCF model, where adatoms have a diffusion bias parallel to the step edges and there is an attachment barrier at the step edge. We find a new linear instability with novel step pattern…
A ferromagnetically coupled gadolinium–radical compound is described. A series of three lanthanide complexes of general formula [Ln(organic radical)2(NO3)3] (Ln =Y3+, La3+, and Gd3+, shown on the right) have been synthesized. With the paramagnetic GdIII a ferromagnetic interaction with the ligands was found, which giv…
The authors analyze the effects of electrodynamic retardation on the collective modes in an unmagnetized infinite superlattice modeled as an array of parallel two-dimensional plasma layers embedded in a dielectric substrate. The present work concentrates for the most part on correlated semiconductor superlattices, alt…