Browsing Chemistry Faculty Research, Publications and Presentations by Title
Now showing items 194-213 of 234
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Synthesis of symmetric meso-H dipyrrin hydrobromides from 2-formyl pyrroles
The reaction of 2-formyl pyrroles in acidic methanol gives the corresponding symmetric, meso-H 4,6-dipyrrin hydrobromides. This convenient strategy involves initial deformylation under the acidic conditions, followed by ... -
Synthesis, Lithium Insertion and Thermal Stability of Si–Mo Alloys
Li insertion was investigated in SixMo100−x (90 ≥ x ≥ 70, Δx = 10) alloys prepared by mechanical ball milling. X-ray diffraction (XRD) and quantitative phase analysis were used to analyze phase compositions of these Si–Mo ... -
Synthesis, properties and reactivity of BCl2 aza-BODIPY complexes and salts of the aza-dipyrrinato scaffold
The synthesis and characterisation of the BCl2-chelated complexes of both archetypal aza-dipyrrin sub- types are presented. A stepwise halogen exchange, leading to a mixed-halide Cl–B–F intermediate, is implicated in the ... -
Synthetic studies toward the kempane diterpenes. Construction of a key tricyclic intermediate
A synthetic sequence is described for construction of the tricyclic portion (35) of kempane diterpenes. The central stereochemistry was established by a Diels-Alder addition of 2,6-dimethyl-para-benzoquinone to a 5-membered, ... -
Technique for determination of accurate heat capacities of volatile, powdered, or air-sensitive samples using relaxation calorimetry
We introduce a four-step technique for the accurate determination of the heat capacity of volatile or air-sensitive samples using relaxation calorimetry. The samples are encapsulated in a hermetically sealed differential ... -
Temperature dependence of thermal conductivity enhancement in single-walled carbon nanotube/polystyrene composites
The thermal conductivity of single-walled carbon nanotube (SWCNT)/polystyrene composites, prepared by a method known to produce a uniform distribution of SWCNT bundles on the micrometer length scale, was measured in the ... -
Temperature dependent lattice misfit and coherency of Al3X (X = Sc, Zr, Ti and Nb) particles in an Al matrix
The lattice coherency and critical radii for Al3X precipitates in an aluminum matrix were computed using first-principles methods. From density functional perturbation theory and the quasi-harmonic approximation, the unit ... -
Thermal and Diffraction Studies of Phase-Transitions in the Incommensurate Compound [P(Ch3)(4)]2CuCl4
Calorimetric and x-ray-diffraction studies of the commensurate -
Thermal and lattice dynamical properties of Na8Si46 clathrate
The experimental heat capacity of Na8Si46 has been determined from 35-300 K, and its lattice parameters have been measured over the range 100-330 K. The experimental heat capacity and the thermal-expansion coefficient ... -
Thermal conductivities of a clathrate with and without guest molecules.
The thermal conductivities of Dianin's compd. [4-(p-hydroxyphenyl)-2,2,4-trimethylchroman] and its ethanol adduct in the temp. range 20-250 K are reported. This clathrate has the same stable structure both with and without ... -
Thermal conductivity of (Er1-xYx)(2)Ti2O7 pyrochlore oxide solid solutions
The thermal conductivities of pyrochlore oxide solid solutions of general formula (Er1-xYx)(2)Ti2O7 with 0 <= x <= 1 have been determined for high-quality single crystals aligned along the [110] direction, over the ... -
Thermal, vibrational, and thermoelastic properties of Y2Mo3O12 and their relations to negative thermal expansion
Y2 Mo3O12, a material that exhibits negative thermal expansion (NTE) from 10 to 1173 K, offers an excellent opportunity to examine relationships between NTE and other physical properties over a wide temperature range. We ... -