Main group elements in unusual coordination environments
Abstract
Materials Literature
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Thermal Isomerization of All-trans-Lutein in a Benzene Solution
Four major cis-lutein isomers could be identified after thermal isomerization of all-trans-lutein in a benzene solution system; namely, 13'-, 13-, 9'- and 9-cis-luteins. Using both all-trans-lutein and a mixture of these purified cis-luteins as starting materials, the quantitative changes determined by HPLC response s…
Synthesis, crystal structure, molecular orbital calculations and electronic properties of 2,3-di(2-pyridyl)naphtho[2,3-f ]quinoxaline-7,12-quinone (Aqdpp)
The synthesis, characterization and crystal structure of 2,3-di(2-pyridyl)naphtho[2,3-f]quinoxaline-7,12-quinone (Aqdpp) are reported. Molecular orbital calculations have been carried out in order to characterize its reactivity and coordination properties. Surface maps for the electronegativity, hardness and Fukui fun…
On the rapid evaluation of cofactors in the calculation of nonorthogonal matrix elements
The calculation of matrix elements involving nonorthogonal orbitals is speeded up by recognizing the orthogonalities between orbitals, leading to generalized Slater rules. The block structure present in the overlap matrix makes an efficient evaluation of its cofactors possible. These cofactors are calculated per subbl…
Direct Observation of t-Butyl Alcohol Frozen and Sublimated Samples Using Low-Vacuum Scanning Electron Microscopy.
Frozen biological specimens in t-butyl alcohol were examined under a low-vacuum environment in a "wet SEM" or "variable pressure SEM (scanning electron microscope)" equipped with a cooling stage and highly sensitive backscattered detector of the YAG type. After fixation with glutaraldehyde and osmium tetroxide, rat ti…
Surface hardening of iron-carbon alloys by arc quenching
(1998). Surface hardening of iron-carbon alloys by arc quenching. Welding International: Vol. 12, No. 4, pp. 326-328.
Adhesion behavior of PDMS-containing polyimide to glass
The effect of the incorporation of poly(dimethyl siloxane) (PDMS) segments into a poly[N,N'-(p,p'-oxydiphenylene) pyromellitimide] (PMDA-ODA) polyimide backbone on the adhesion between PMDA-ODA polyimide and glass was investigated using X-ray photoelectron spectroscopy (XPS), infrared (IR) spectroscopy, contact angle…
Phthalocyanines and Related Compounds: Subunits for the Preparation of Molecular Materials
The design, synthesis, structural and physical characterization and engineering, and the study of the electrical conductivity and the nonlinear optical properties of phthalocyanines and molecular substances related to them, such as subphthalocyanines, hemiporphyrazines and triazolephthalocyanines were reviewed.
A problem in algal ecology - contamination of habitats from adjacent communities
Problems associated with the contamination of distinct diatom communities by live or dead frustules (valves) from adjacent communities are discussed.The importance of the recog) tion and discrete sampling of the numerous microhabitats in both freshwater and marine systems is stressed, Special comments are made concern…
Synthesis and Microwave Absorptive Properties of Lithium Ferrite Nanocrystals
Lithium ferrite nanocrystals were synthesized using polyethylene glycol as a protecting agent for colloidal particles via the sol-gel process. The microwave absorbing properties of lithium ferrite nanocrystals were investigated on the frequency range of 8.0-12.4 GHz using an HP-8410B network analyzer. The results show…
Intensified Photoluminescence of Eu<sup>3+</sup> in the Phase-Separated Borosilicate Glass
Eu3+ containing 3Na2O⋅42B2O3⋅55SiO2 (mol%) glass was isothermally heat-treated for phase separation. The photoluminescence (PL) behavior of Eu3+ was investigated. It was found that PL intensity of 5D0→7F2 transition of Eu3+ increases with evolution of phase separation. A maximum 6.5 times increment in the PL intensity…
Effect of ternary addition on the formation of Cu3Pt and CuPt order phases in the Cu-Pt system
The effect of addition of ternary elements, mainly In and Pd, on the phase fields of CuPt3 with the L12 type of ordered structure and CuPt with an L11 type of ordered structure in the Cu-Pt system has been investigated and the results compared with the substitution behaviour of the added elements and the electron-atom…
A new technology to manufacture polypropylene foam sheet and biaxially oriented foam film
Foamed polymers are future materials with their wide application spheres. They can be used to enhance appearance as insulating structures or to save material costs. This study addresses all of these and concerns a new technology to produce foamed tubes and films. An entire blown film extrusion line was built up to ful…
Analysis of Dodecahedral Voids in Single-Quasicrystalline Al–Pd–Mn by Scanning Electron Microscopy and Auger Electron Spectroscopy
Scanning electron microscopy and microprobe Auger electron spectroscopy were used for characterizing the morphology and the surface composition of voids in the bulk of icosahedral Al–Pd–Mn single-quasicrystals. The samples were prepared by in-situ cleavage fracture in the ultra-high vacuum. The void images could be ex…
XPS study of coating delamination from non-rinse chromate treated steel
The mechanisms of delamination of an epoxy coated steel system with various substrate non-rinse chromate treatments has been investigated by XPS and TOF-SIMS. First, the chromate surface before epoxy coating was investigated to establish the layer structure produced by the chromate treatments. The pre-treatment layer…
Structure of Alkali Metal Hydroxamates and their Lossen Rearrangement
Neutral alkali metal salts of benzhydroxamic acids described in the literature are in fact acid salts; neutral salts rearrange to N,N′-diarylureas under mild conditions.
Efficient stimulated Brillouin scattering in the organic crystal deuterated L-arginine phosphate monohydrate
A stimulated Brillouin scattering phase-conjugate mirror with the organic nonlinear optical crystal deuterated l-arginine phosphate monohydrate has shown a reflectivity of more than 80% at 1064 nm. We demonstrate the correction of a deliberate aberration for a 10-Hz Nd:YAG laser by this crystal.
Lowest Excited State of Oxovanadyl(IV) Tetraphenylporphyrin
The excited-state relaxation dynamics and pathways of oxovanadyl(IV) tetraphenylporphyrin (OV IV TPP) have been investigated by nanosecond time-resolved and steady-state emission, transient absorption, and transient resonance Raman spectroscopies. At room temperature, the emission spectrum shows a single broad feature…
Mechanically Activated Low Temperature Synthesis of Sr Doped Lanthanum Manganite
Alkaline earth doped lanthanum manganites (La 1-x M x MnO 3+δ , with M=Ca, Sr, Ba...) are attracting materials because of their peculiar properties displayed in giant magnetoresistance and electrocatalytic activity Classical synthesis routes of the material make use of solid state reaction, among suitable precursors,…
Silicon as a candidate carrier for ERE
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