Materials Literature
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Several anionic complexes of lanthanoid metals with the 2,6-diphenylphenolate ligand have been synthesized and their room-temperature single-crystal structures determined. In novel reactions of anhydrous LnCl 3 (Ln = Nd or Er) with NaOC 6 H 3 Ph 2 -2,6·0.5thf (thf = tetrahydrofuran) in 1,3,5-tri-tert-butylbenzene at 3…
Abstract When polymers are added to a solution containing proteins, the protein may deposit as an amorphous precipitate or as crystals. Experimental evidence indicates that from a thermodynamic viewpoint, an amorphous precipitate should be treated as a liquid phase dense in the protein and crystals as true solids. To…
2,4,6-Trinitrotoluene (TNT) can crystallise in both monoclinic and orthorhombic polymorphic forms characterised by two distinct molecular packing configurations in the solid-state associated with two conformationally unique molecules (A and B) in the asymmetric unit with four asymmetric units in the unit cell. In this…
Polyvinyl N-alkyl carbamates belong to the general class of long alkyl side chain polymers. Such polymers are commonly used as release coatings for pressure sensitive adhesive tapes. In this paper the bulk, surface, and interfacial structures of polyvinyl N-alkyl carbamates having either decyl or octadecyl side chains…
The first examples of thiophenotribenzoporphyrazines have been synthesised. The compounds obtained bear either six or eight alkyl chains and show Q-band absorptions which are red shifted relative to analogous phthalocyanine derivatives. Their formulations as spin coated films show broad band absorption extending into…
meso-Tris(4-pyridyl)[[(omega-hydroxyhexamethylene)carbamoyl]phenyl ] porphyrin was converted to its H-phosphonate derivative and conjugated using solid phase synthesis with the 5'-hydroxyl group of deoxyribonucleotides d(TCTTCCCA) and d(T)12. These conjugates were transformed into their (N-methylpyridiniumyl)porphyrin…
A novel charge-transfer complex, [4-DMSP] 4 [NH 2 Me 2 ] 2 HSiFeMo 11 O 40 ·3H 2 O 1 {4-[DMSP]I = 4[p-(dimethylamino)styryl]pyridine methiodide} prepared and crystallized in a non-centrosymmetric (space group P1) structure, exhibits second harmonic generation (SHG) of 1064 nm radiation with an efficiency 1.2 times tha…
A convenient electrochemical method has been developed for the preparation of a functionalised, colloidal graphite (oxide). The method involves the anodic erosion of graphite electrodes by the generated oxygen when using current densities less than 3 mA cm -2 . The suggested mechanism of formation involves the loss of…
We evaluated the blood compatibility of various amphiphilic polymers, that is, n-butyl methacrylate (BMA) copolymers with methacrylates having a phosphorylcholine (PC), hydroxy (OH) or methoxy (MeO) group as an end polar group in the oxyethylene side chain. The amount of proteins adsorbed on the PC-polymer from human…
Two mechanisms of microbially influenced corrosion (MIC) are discussed and compared: corrosion modified by the presence of (1) sulfate-reducing bacteria (SRB) and (2) manganese-oxidizing bacteria (MOB). It is demonstrated that the nature of MIC in both cases depends on the nature of inorganic materials precipitated at…
A combined theoretical and experimental study of molybdenum phosphates containing Mo(V) either as purely Mo(V) or as mixed-valent Mo(V)/Mo(VI) and Mo(IV)/Mo(V) is performed. This investigation, based on a structural classification of molybdenum phosphates, derived from that proposed by Costentin et al., allows a detai…
Synopsis:It is broadly recognized that the adsorption of superplasticizers on cement particles is a key factor in determining the rheology of concrete.In order to avoid the problems linked to the hydration of cement, the adsorption of superplasticizers is often studied on unreactive model powders.However, in order for…
The segmental ligand 2-(6-carboxypyridin-2-yl)-1,1′-dimethyl-2′-(5-methylpyridin-2-yl)-5,5′-methylenebis(1H-benzimidazole) (L9) reacted with an equimolar mixture of LnIII (Ln = La or Eu) and ZnII in basic conditions to give selectively the self-assembled dinuclear non-covalent podates [LnZn(L9 – H)3]2+. Electrospray m…
The gelation of aqueous poly(vinyl alcohol) (PVA) solution was accelerated by addition of a small amount of silk fibroin (SF). The peculiar structure found in heterogeneous SF/PVA blend films was analysed by polarizing microcopy, differential scanning calorimetry (DSC), infrared spectroscopy (IR), and scanning electro…
Polyamine-brushed substrata for cell culture were designed by solvent casting of polystyrene-graft-polyamine copolymer (SA) on hydrophobically modified glass surface, and adhesion, spreading, and proliferation of bovine aortic endothelial cells (BAEC) on these substrata were evaluated. Adhesion and spreading of BAEC i…
The ring currents in the sterically congested and highly nonplanar porphyrin complexes 1a and 2a have been investigated using a double-dipole model of the porphyrin ring current effect. The equivalent dipoles needed to simulate the ring current in the saddle-shaped complex 1a were indistinguishable from those previous…
The kinetics of aggregation of colloidal silica, with a single-sphere diameter of 12 nm, under reaction-limited conditions, have been studied over a range of particle number concentrations and ionic strengths. Second-order rate coefficients in the initial stages of the reaction were found to vary from 3 × 10 −18 to 2…
From the reaction of the elemental lanthanides and actinides in molten alkali metal/polychalcogenide salts, several new ternary compounds have been discovered. Specifically, these phases are K 4 USe 8 (I) and ALnQ 4 (II), where A = K, Ln = Ce or Tb, and Q = Se or A = Rb, Ln = Ce, Q = Te; and NaLnS 3 (III), where Ln =…
A new type of phthalocyanine-based chromophore system having two metallophthalocyanine rings bound together through ethynyl linkages has been synthesized.
In order to investigate the effect of film thickness of thin graphite crystals on the electrical properties, we prepared thin graphite films by cleaving a kish graphite (KG) crystal with the rrr value of 32.3. The values of the thickness of the graphite films were ranging from around 300 to 1000Å. Keeping these graphi…