Browsing Chemistry (Scholarly Publications) by Sponsor "Deutsche Forschungsgemeinschaft (DFG)"
Now showing items 1-12 of 12
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7-Nitro-5,10,15,20-tetraphenylporphyrin Dichloromethane Solvate
(International Union of Crystallography, 1998)The title compound shows significant conformational distortion in the vicinity of the [beta]-nitro group. This is attributed to steric interaction between a meso-phenyl and the [beta]-nitro group. The overall degree of ... -
Axial Coordination Phenomena in Highly Substituted Porphyrins. Crystal Structure of the Polymeric (2,3,7,8,12,13,17,18-Octaethyl-5,10,15,20-tetranitroporphyrinato)zinc(II), [{Zn(oetnp)}n]
(Royal Society of Chemistry, 1994)The polymeric structure of the sterically strained and non-planar porphyrin [{ZnIIoetnp}n] is determined by X-ray crystallography; polymerization is achieved by utilization of the nitro-groups for axial ligation to the ... -
Bis(methanol-O)(2,3,7,8,12,13,17,18-octaethylporphyrinato-N,N',N",N'")-iron(III) Perchlorate Bis(methanol) Solvate, [Fe(III)oep(HOCH3)2][ClO4].2CH3OH
(International Union of Crystallography, 1996)Simple treatment of [FeIII(oep)Cl] (where oep is octaethylporphyrin) with dilute perchloric acid leads to facile preparation of the title compound, [Fe(C36H44N4)(CH4O)2](ClO4).2CH4O. The structure consists of discrete ... -
Bis[anhydro-meso-rhodochlorinato XV methyl ester)zinc(II)]
(International Union of Crystallography, 1997)The title compound bis[(methyl 8,13-diethyl-2,21,22,23-tetrahydro- 3,7,12,17-tetramethyl-23-oxo-3H-benzo[at]porphyrin-18-carboxylato-Kappa4N)- zinc(II)], [Zn(C33H34N4O3)]2, has similar structural characteristics to the ... -
Crystal Structure of a Remarkably Ruffled Nonplanar Porphyrin - (Pyridine)(5,10,15,20-Tetra(tert-butyl)porphyrinato)zinc(II)
(Royal Society of Chemistry, 1995)The title compound presents the first example of a sterically ruffled porphyrin bearing only meso substituents; the degree of ruffling is severe, with Cm-displacements of up to 1 ?. -
A Novel 2,18-Bridged Biliverdin Derivative
(Royal Society of Chemistry, 1993)Base-catalysed dehydrohalogenation of a 3,18-bis(2-chloroethyl)biliverdin 1 affords a novel 3-vinylbiliverdin 3 in which the 2- and 18-positions are bridged with a propano-tether; the structure of 3 has been established ... -
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. ... -
Structural Evidence for Nonplanar Keto- and Planar Enol-Forms of Oxophlorins
(Royal Society of Chemistry, 1992)The first structural investigation of a zinc(II) and a free-base oxophlorin reveals considerable conformational differences between the keto-(1) and enol-form (2) of oxophlorins. -
Structure and Conformation of Photosynthetic Pigments and Related Compounds. 10. Comparison of a Phytochlorin and Phytoporphyrin Derived from Chlorophyll a
(International Union of Crystallography, 1997)The crystal and molecular structures of 17-decarboxyethyl-131-deoxo-17-propylphytochlorin, C33H40N4, (1), and phytoporphyrin methyl ester, C34H36N4O3, (2), are compared. Compound (1) shows structural parameters similar to ... -
Structure and Conformation of Photosynthetic Pigments and Related Compounds. 11. 5,10,15,20-Tetrabutylbacteriochlorin
(International Union of Crystallography, 1998)The structure of the title compound, C36H50N4, is the first example of a tetra-meso-substituted free-base bacteriochlorin (2,3,12,13-tetrahydroporphyrin). While general structural characteristics are similar to other ... -
Synthesis and crystal structures of cofacial bischlorins - Octaethylchlorin-based structural models for the special pair in photosynthesis
(Royal Society of Chemistry, 1996)McMurry coupling of metalloformyloctaethylchlorins yields the first cofacial bischlorin with structural characteristics mimicking those of the special pair in photosynthesis. -
Vibrational characterization of different benzene phases on flat and vicinal Si(100) surfaces
(2007-10-17)Based on high-resolution electron energy loss spectroscopy and temperature-programmable desorption, benzene chemisorption on vicinal and nominally flat Si 100 surfaces has been studied for various adsorption, annealing, ...