Chemistry (Scholarly Publications): Recent submissions
Now showing items 541-560 of 931
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Strain effects on the ionic conductivity of Y-doped ceria: A simulation study
(2014)In this paper we report a computational study of the e ects of strain on the conductivity of Y-doped ceria (YDC). This material was chosen as it is of technological interest in the eld of Solid Oxide Fuel Cells (SOFCs). The ... -
Synthesis of meso-Substituted ABCD-Type Porphyrins by Functionalization Reactions
(2010)Considerable progress has been made in recent years in the search for synthetic methods leading to functionalized porphyrins, esp. for modification of either the ?- or meso positions. For the latter, total synthesis ... -
Chemically Modulated Graphene Diodes
(2013)We report the manufacture of novel graphene diode sensors (GDS), which are composed of monolayer graphene on silicon substrates, allowing exposure to liquids and gases. Parameter changes in the diode can be correlated with ... -
A new generation of aprotic yet Bronsted acidic imidazolium salts: effect of ester/amide groups in the C-2, C-4 and C-5 on antimicrobial toxicity and biodegradation
(2013)Imidazolium Brønsted acidic catalysts substituted with ester/amides have been assessed for both antimicrobial toxicity and biodegradation. Low toxicity to a screen of 20 microbial strains (12 fungi and 8 bacteria) was ... -
A new generation of aprotic yet Bronsted acidic imidazolium salts: low toxicity, high recyclability and greatly improved activity
(2013)Catalysts which have low antimicrobial toxicity and are aprotic, yet which can act as Brønsted acidic catalysts in the presence of protic additives have been developed. The catalysts are recyclable, considerably more active ... -
Synthesis and Reactivity of Allenylporphyrins
(2013)Several different methods have been utilized for the effective synthesis of a new class of porphyrins that contains the synthetically intriguing propadienyl (or allenyl) functional group. Of these approaches, successive ... -
Synthesis and biological evaluation of Foscan® bile acid conjugates to target esophageal cancer cells
(2013)Porphyrins and chlorins such as Foscan? have a natural proclivity to accumulate in cancer cells. This trait has made them good candidates for photosensitizers and as imaging agents in phototherapy. In order to improve ... -
Chemical Synthesis in Solution and Porphyrin Nanostructures on Surfaces - Similar Concepts, Different Results.
(2013)The chemistry of porphyrins is reaching out to more complex and ever larger polyporphyrin arrays. In solution the synthesis of porphyrin arrays is greatly aided by recent advances in organometallic chemistry which now ... -
Synthesis and Functionalization of Triply Fused Porphyrin Dimers
(2013)Current applications of porphyrins in medicine and optics, such as photodynamic therapy or nonlinear absorption, increasingly require the use of far-red absorbing dyes. Modifications to the porphyrin structure to ... -
Computational Quantification of the Physicochemical Effects of Heme Distortion: Redox Control in the Reaction Center Cytochrome Subunit of Blastochloris viridis.
(2013)A facile, experimentally calibrated computational procedure is described that affords the relative ordering of heme cofactor reduction potentials with respect to intrinsic shifts brought about by apoprotein induced ... -
Modeling of nonlinear absorption of 5,10-a(2)b(2) porphyrins in the nanosecond regime.
(2013)The nonlinear absorption (NLA) properties of free base and metalated porphyrins with a unique 5,10- A2B2 substitution pattern were studied with open Z-scan technique at 532 nm in the nanosecond regime over a broad range ... -
High content screening as high quality assay for biological evaluation of photosensitizers in vitro.
(2013)A novel single step assay approach to screen a library of photdynamic therapy (PDT) compounds was developed. Utilizing high content analysis (HCA) technologies several robust cellular parameters were identified, which can ... -
5,15-Bis(4-pentyl-oxyphen-yl)porphyrin.
(2013)In the title compound, C42H42N4O2, the complete molecule is generated by a crystallographic inversion centre. The porphyrin system exhibits a near planar macrocycle conformation with an average deviation from the ... -
Preparation of b- and g-lactams from carbamoyl radicals derived from oxime oxalate amides.
(2004)A general synthetic route to oxime oxalate amides was developed and applied to the preparation of molecules incorporating N -benzyl- N -alkenyl amides linked with acetone oxime or benzaldoxime units. In addition, 2 ... -
Conformational effects in sugar ions: spectroscopic investigations in the gas phase and in solution
(2012)We present direct investigations of the conformational preferences of sugars with a positively charged substituent at their anomeric centre, C-1, which display in solution, a preference for an equatorial conformation—an ... -
An unusual glycosylation product from a partially protected fucosyl donor under silver triflate activation conditions.
(2013)Partially protected glycosyl donors are extremely useful reagents for oligosaccharide synthesis allowing more facile deprotection and enhanced activity due to lower steric restraints. A partially protected fucosyl donor ... -
From dioxime oxalates to dihydropyrroles and phenanthridines via iminyl radicals.
(2008)Dioxime oxalates are useful precursors for the clean generation of iminyl radicals by sensitised UV photolysis and can be adapted for serviceable preparations of 3,4-dihydro-2H-pyrroles and phenanthridines. -
Preparation of oxime oxalate amides and their use in free-radical mediated syntheses of lactams.
(2002)Photosensitised decomposition of oxime oxalate amides is a useful new route to carbamoyl radicals that may cyclise to afford β- or γ-lactams. -
Huisgen-based conjugation of water-soluble porphyrins to deprotected sugars: Towards mild strategies for the labelling of glycans
(2014)Fully deprotected alkynyl-functionalised mono- and oligosaccharides undergo CuAAC-based conjugation with water-soluble porphyrin azides in aqueous environments. The mild reaction conditions are fully compatible with the ... -
Formal encapsulation of [Fe(H2O)6]3+ by dinuclear {Fe2(hpdta)} units leads to a nonanuclear S = 13/2 Fe(III) oxo-cluster showing magnetic hysteresis
(2005)Under solvothermal conditions the unprecedented nonanuclear Fe(III) aggregate [Fe9(mu3-O)4(mu-OH)4(hpdta)4]5- is formed through the formal encapsulation of [Fe(H2O)6]3+ by four [Fe2(hpdta)(H2O)2]+ units: the aggregates ...