Materials Literature
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The new three-dimensional cobalt(II) complex of formula [Co2(bpm)(H2O)2(CO3)(OH)]NO3·4H2O (1) is obtained from aqueous solutions containing cobalt(II) nitrate hexahydrate, 2,2‘-bipyrimidine (bpm), and potassium bicarbonate. The cobalt atoms are bridged by bischelating bpm, single μ2-hydroxide, and μ4-carbonate groups.…
Boron-bearing 2M1 polylithionite and 2M1 + 1M boromuscovite from an elbaite pegmatite at Řecice, western Moravia, Czech Republic.
The action spectra of the colloidal TiO 2 -photosensitized oxidations of bifunctional aromatics in 1 mM phosphate colloidal media provide firm evidence that electron transfer from outer-sphere donors can compete with excited hole relaxation at nanoparticle interfaces. The possibility and extent of the competition are…
Catalysis over Lewis acid sites on siliceous mesoporous FSM-16 was confirmed. Acidic property of FSM-16 was studied by pyridine TPD measurements, and catalyses of α-pinene isomerization and methylamine synthesis. FSM-16 possess both Brønsted and Lewis acid sites, and another Lewis acid site formed on FSM-16 when a cat…
Various surface processes for the system B/N/H/F occurring during CVD growth of c-BN (111) have been investigated theoretically, using quantum mechanical methods. Both F and H species were found to be efficient as surface stabilizing agents. Mainly the H-terminated part of the B(111) surface will most probably undergo…
The representation of all components of the tensor of linear thermal expansion by temperature derivatives of lattice parameters a, b, c, alpha , beta , and gamma has been extended to triclinic symmetry. The advantages of this approach are elucidated by taking data of alpha -CuMoO 4 as an example. The uncertainty due t…
Preparation of Grignard reagents from organic halides and magnesium pose potential safety hazards on scale-up due to their high exothermic potential which can lead to overpressurization, discharge of contents, or explosion. One of the main challenges arises in ensuring the reaction has initiated before excessive accum…
This paper reports the synthesis and physical properties of a novel aromatic polymer which contains the tridentate 2,6-bis(benzimidazol-2-yl)pyridine moiety. It was found that the polymer exhibits different luminescence properties in solution and in the solid state because of the formation of polymer aggregates. Upon…
A novel 2-perfluoroalkyl-activated bisfluoro monomer has been synthesized successfully using a Pd(0)-catalyzed cross-coupling reaction of 4-fluoro-3-trifluoromethyl phenyl boronic acid with 4,4‘-dibromodiphenylbenzene. This monomer was converted to novel poly(aryl ether)s by nucleophilic displacement of the fluorine a…
The occurrence of barium sulfate scale (BaSO 4 ) is a severe problem and its associated environmental concerns in oil and gas production worldwide will cause considerable production losses. Chemical dissolution will create a new direction for controlling the scale deposits by chelating agents, which form strong comple…
The aenigmatite-rhonite mineral group consists of eight minerals: Aenigmatite, rhonite, serendibite, krinovite, welshite, dorrite, wilkinsonite and hogtuavite. The general chemical formula of the minerals in this group may be written as {X2} [Y6] (Z6) O 20 , with {X} eightfold coordinated Na (super +) , Ca (super 2+)…
A synthetic access to the first members of expanded corroles 1 and 2 is achieved through formation of two direct pyrrole−pyrrole links by an oxidative coupling reaction. Spectroscopic and structural analysis reveal that 1 and 2 are 22Π aromatic macrocycles despite the nonplanar structure and properties resemble that o…
Interactions of the water-soluble tetra(4-sulfonatophenyl)porphyrin (TPPS 4 ) with ionic micelles in aqueous solutions have been studied by optical absorption, fluorescence, resonance light-scattering (RLS), and 1 H NMR spectroscopies. The presence of three different species of TPPS 4 in cationic cetyltrimethylammoniu…
Hollow polyelectrolyte capsules were fabricated by means of stepwise adsorption of polyelectrolytes followed by dissolution of the templating core. The capsule wall thickness was approximately 20 nm. The diameter of the capsules is given by the size of the templates (3.3 μm). These capsules exclude poly(styrenesulfona…
A theoretical analysis of the scattering of plane-wave atomic excitations in disordered solids has been made in terms of the spectral densities. Hybridization between transverse and longitudinal waves of approximately the same frequency is demonstrated. The analytic results agree well with the results obtained from co…
The transmission of conductance modes in atom-size gold contacts is investigated by simultaneously measuring conductance and shot noise. The results give unambiguous evidence that the current in the smallest gold contacts is mostly carried by nearly fully transmitted modes. In particular, for a single-atom contact the…
Investigations have been carried out to probe the interactions between double-stranded DNA and amine-terminated, ethylenediamine core polyamidoamine starburst dendrimers generation 2 (G2), generation 4 (G4), and generation 7 (G7). Ethidium bromide is used as a fluorescent probe for this study. Under our experimental c…
We report in this paper a procedure to simulate the deposit of carbon diamondlike films over the Si(001) surface. We use the method of tight-binding molecular dynamics and well-known transferable C-C and Si-Si interactions. We propose for the Si-C interaction a weighted average of the single element interactions and t…
The title compound, C19HI8FeN2 or [Fe(CsHs)(CI4HI3-N2)], crystallizes in space group P2~/n with two molecules in the asymmetric unit. The pyrrole groups take part in intermolecular (pyrrole)N--H...Tr(pyrrole) interactions through a hydrogen-bonded ring system involving four pyrrole groups, with N..-(pyrrole centroid)…
An analytical function is presented of the measurable structure factor of a multi-species polydisperse Percus-Yevick fluid consisting of spherical particles with Schulz distributed diameters. As a demonstration, polydispersity effects on some structural properties in the single species polydisperse fluid are investiga…