Indogermanische Forschungen; Zeitschrift fur Indogermanistik und allgemeine Sprachwissenschaft.

Publication suspended June 1944-May 1948.

Romanische Sprachwissenschaft,

"Literatur" : v. 1, p. [6]-9; v. 2, p. [8]

Monographien über Angewandte Elektrochemie

Mode of access: Internet.

Jahresbericht / Vereinigung fur angewandte Botanik, Berlin.

Mode of access: Internet.

Die Fortschritte der hebraischen Sprachwissenschaft von Jehuda Chajjug bis David Kimchi : X. bis XIII Jahrhundert.

Thesis (doctoral)--Universitat Bern.

Angewandte Botanik.

Editors: 1919-26, P. P. Graebner, E. F. Gilg (with K. Müller, 1919-22; with K. Snell, 1922-26; with A. Voigt, 1923-26)--1927- K. Snell.

Zeitschrift für Elektrochemie und angewandte physikalische Chemie : herausgegeben von der Deutsche Bunsen-Gesellschaft für Angewandte.

Title from cover.

Einfluss von außerschulischen Lernorten auf die Gestaltung von technisch geprägten Karrierewegen : eine empirische Analyse der Effekte des Engagements im Schüler-Institut für Technik und angewandte Informatik (SITI) e. V. auf die Berufswahl

Frank Bünning, Juliane Lehmann

Textroutinen: Erwerb, Förderung und didaktisch-mediale Modellierung. Themenbereich I der 39. Jahrestagung der Gesellschaft für Angewandte Linguistik e.V. (GAL) vom 16.–18. September 2009 in Karlsruhe

Tagungsbericht zum Themenbereich I der 39. Jahrestagung der Gesellschaft für Angewandte Linguistik e.V. (GAL) vom 16.–18. September 2009 in Karlsruhe.

Cooperation Agreement for an Action of the German Academic Exchange Service (DAAD) between Hochschule für angewandte Wissenschaften München and Universidad de Cuenca

English

Azoporphyrin : the porphyrin analogue of azobenzene

Azobenzenes (1,2-diaryldiazenes) are very important organic pigments, and they have a unique place in the field of photoresponsive conjugated molecules due to their (usually) reversible E/Z photoisomerisation. The current intense interest in molecular analogues of mechanical components and information storage and processing elements has stimulated research into conjugated molecules whose shape and/or optical properties can be switched electro- or photochemically. Among the classes of conjugated pigments being explored in these contexts are the porphyrinoids, which offer advantages of intense light absorption, a variety of accessible oxidation states, and synthetic control of properties through peripheral or central substitution. Extension of porphyrinoid conjugation can be achieved by linking the peripheral carbons either by three direct bonds (as in the “porphyrin tapes” of Osuka et al.) or through potentially conjugating bridges such as alkenes or, even better, alkynes.

Reduction of nitroaromatic compounds on supported gold nanoparticles by visible and ultraviolet light

Shedding light: Nitroaromatic compounds on gold nanoparticles (3 wt %) supported on ZrO2 can be reduced directly to the corresponding azo compounds when illuminated with visible light or ultraviolet light at 40 °C (see picture). The process occurs with high selectivity and at ambient temperature and pressure, and enables the selection of intermediates that are unstable in thermal reactions.

Exploiting the 1,2,3-triazolium motif in anion-templated formation of a bromide-selective rotaxane host assembly

Stimulated by the efficacy of copper (I) catalysed Huisgen-type 1,3-dipolar cycloaddition of terminal alkynes and organic azides to generate 1,4-disubstituted 1,2,3-triazole derivatives, the importance of ‘click’ chemistry in the synthesis of organic and biological molecular systems is ever increasing.[1] The mild reaction conditions have also led to this reaction gaining favour in the construction of interlocked molecular architectures.[2-4] In the majority of cases however, the triazole group simply serves as a covalent linkage with no function in the resulting organic molecular framework. More recently a renewed interest has been shown in the transition metal coordination chemistry of triazole ligands.[3, 5, 6] In addition novel aryl macrocyclic and acyclic triazole based oligomers have been shown to recognise halide anions via cooperative triazole C5-H….anion hydrogen bonds.[7] In light of this it is surprising the potential anion binding affinity of the positively charged triazolium motif has not, with one notable exception,[8] been investigated. With the objective of manipulating the unique topological cavities of mechanically bonded molecules for anion recognition purposes, we have developed general methods of using anions to template the formation of interpenetrated and interlocked structures.[9-13] Herein we report the first examples of exploiting the 1,2,3-triazolium group in the anion templated formation of pseudorotaxane and rotaxane assemblies. In an unprecedented discovery the bromide anion is shown to be a superior templating reagent to chloride in the synthesis of a novel triazolium axle containing [2]rotaxane. Furthermore the resulting rotaxane interlocked host system exhibits the rare selectivity preference for bromide over chloride...