Chemistry (Scholarly Publications): Recent submissions
Now showing items 801-820 of 931
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Dynamics of ultrafast dissociation of hydrogenic molecules by resonant antibonding core electron excitation: Conclusions from detuning dependence of H+- kinetic energy distributions from condensed films
(Elsevier, 2011)The ultrafast dissociation dynamics of condensed water and ammonia by resonant core electron excitations have been studied by measuring the kinetic energy distributions of H+-ions desorbed by [N1s]4a1 and [O1s]4a1 excitations ... -
Preparation and properties of buckypaper-gold nanoparticle composites
(2010)Highly conductive buckypaper-gold nanoparticles composites have been prepared by the in situ electroless deposition of gold nanoparticles during the filtration that resulted in increases in conductivities of up to 684% at ... -
Substituted dipyridophenazine complexes of Cr(III): synthesis, enantiomeric resolution and binding interactions with calf thymus DNA.
(2010)[Cr(phen)2(X2dppz)]3+ {X = H, Me, or F} have been synthesised, characterised, and chromatographically resolved into their constituent ? and ? enantiomers. The DNA-binding interactions of each of the racemic complexes were ... -
Chemical microscopy and nanoscopy of bio-materials and living cells, IRMMW-THz
(IEEE, 2010)Raman microspectroscopy of human sperm cells and nearfield infrared microscopy of nanoscale biomaterials like nanografted DNA have been performed. A newly developed station for the ANKA-IR2 beamline combines several ... -
Fast quantification of water in single living cells by near-infrared microscopy
(Royal Society of Chemistry, 2004)We have set up a near-infrared microscope using a tuneable diode laser in the range from 1530 to 1570 nm. This spectral range is close to the peak of the water overtone absorption. We used this new microscope to study ... -
Smart polymer surfaces: mapping chemical landscapes on the nanometre scale
(Royal Society of Chemistry, 2010)We show that Scattering Infrared Near-field Microscopy (SNIM) allows chemical mapping of polymer monolayers that can serve as designed nanostructured surfaces with specific surface chemistry properties on a nm scale. ... -
{rac-5-[Meth-oxy(phen-yl)meth-yl]-10,20-diphenyl-porphyrinato}nickel(II)
(2011)The title compound, [Ni(C40H28N4O)], was obtained from a Grignard reaction of the respective formyl-porphyrin to yield {5-[hy-droxy(phen-yl)meth-yl]-10,20-diphenyl-porphyrinato}nickel(II), followed by crystallization from ... -
Tunable bromomagnesium thiolate Tishchenko reaction catalysts: efficient intermolecular aldehyde-trifluoromethylketone coupling
(2010)A new thiolate-catalyzed Tishchenko reaction inspired by biochemical processes features exceptionally good control over the catalyst's steric/electronic properties. The isolation of reaction intermediates provided valuable ... -
Correlation of photophysical parameters with macrocycle distortion in porphyrins with graded degree of saddle distortion
(2010)Different porphyrin conformations are believed to play a role in controlling the cofactor properties in natural tetrapyrrole-protein complexes. In order to study the correlation between macrocycle nonplanarity and ... -
Porphyrin-magnetite nanoconjugates for biological imaging
(2011)Background: The use of silica coated magnetic nanoparticles as contrast agents has resulted in the production of highly stable, non-toxic solutions that can be manipulated via an external magnetic field. As a result, the ... -
Uncovering the Complex Behavior of Hydrogen in Cu2O
(2011)The behavior of hydrogen in p-type Cu2O has been reported to be quite unusual. Muon experiments have been unable to ascertain the preferential hydrogen site within the Cu2O lattice, and indicate that hydrogen causes an ... -
Reliable processing of graphene using metal etchmasks
(2011)Graphene exhibits exciting properties which make it an appealing candidate for use in electronic devices. Reliable processes for device fabrication are crucial prerequisites for this. We developed a large area of CVD ... -
Conjugated Quantum Dots Inhibit the Amyloid β (1-42) Fibrillation Process
(2011)Nanoparticles have enormous potential in diagnostic and therapeutic studies. We have demonstarted that the amyloid beta mixed with and conjugated to dihydrolipoic acid (DHLA)-capped CdSe/ZnS quantum dots (QDs) of size ... -
Towards more specific O6-Methylguanine-DNA methyltransferase (MGMT) inactivators
(2011)Searching for a novel family of inactivators of the human DNA repair protein O6?methylguanine?DNA methyltransferase (MGMT) which is known to bind to the DNA minor groove, we have computationally modelled and synthesised ... -
Substituted 3,4-pyridynes: clean cycloadditions
(Royal Society of Chemistry, 2000)The stabilisation of 3,4-pyridyne (1) by an alkoxy group adjacent to the ring nitrogen is reported. The regioselective lithiation of 2-ethoxy- (14), 2-methoxy- (18), 2-isopropoxy- (19) and 6-isopropoxy- (26) -3-chloropyridines ... -
Kinetic resolution of sec-alcohols using a new class of readily assembled (S)-proline-derived 4-(pyrrolidino)-pyridine analogues
(2005)We report the development of a new class of readily prepared chiral 4-(pyrrolidino)-pyridine catalysts capable of exploiting both van der Waals (?) and H-bonding interactions, thus allowing remote chiral information to ... -
Asymmetric acyl-transfer promoted by readily assembled chiral 4-N,N-dialkylaminopyridine derivatives
(Royal Society of Chemistry, 2006)The development of a new class of chiral 4-N,N-dialkylaminopyridine acyl-transfer catalysts capable of exploiting both van der Waals (?) and H-bonding interactions to allow remote chiral information to stereochemically ... -
A reductase-mimicking thiourea organocatalyst incorporating a covalently bound NADH analogue: Efficient 1,2-diketone reduction with in situ prosthetic group generation and recycling
(Royal Society of Chemistry, 2007)A new class of bifunctional organocatalyst promotes the chemoselective reduction of diketone electrophiles at catalytic loadings in the presence of an inorganic co-reductant. -
Asymmetric organocatalytic reductions mediated by dihydropyridines
(Royal Society of Chemistry, 2007)Catalytic asymmetric reduction reactions have long been the preserve of the transition metal catalyst. Inspired by the myriad efficient enzyme-catalysed reduction reactions routine in biological systems, chemists have ... -
Synergistic organocatalysis in the kinetic resolution of secondary thiols with concomitant desymmetrisation of an anhydride.
(2010)An organocatalytic process mediated by a single small-molecule catalyst involving the highly enantioselective desymmetrisation of an achiral electrophile while it simultaneously kinetically resolves a racemic nucleophile ...
