“Housing is a Human Right, Not a Business”

In 2020, Berlin’s regional parliament adopted a law to freeze rent prices in the capital for five years, Brussels set up an emergency plan for affordable housing after failing to reach its capacity objectives in 2020, and Paris reintroduced rent control after a significant increase in rental costs in 2019. But what about Vienna, the city long considered a European model for its housing system? The Austrian capital is often praised for playing a ‘pioneering role on an international scale’ when..

An Octanuclear Metallosupramolecular Cage Designed To Exhibit Spin-Crossover Behavior.

By employing the subcomponent self-assembly approach utilizing 5,10,15,20-tetrakis(4-aminophenyl)porphyrin or its zinc(II) complex, 1H-4-imidazolecarbaldehyde, and either zinc(II) or iron(II) salts, we were able to prepare O-symmetric cages having a confined volume of ca. 1300 Å3 . The use of iron(II) salts yielded coordination cages in the high-spin state at room temperature, manifesting spin-crossover in solution at low temperatures, whereas corresponding zinc(II) salts led to the corresponding diamagnetic analogues. The new cages were characterized by synchrotron X-ray crystallography, high-resolution mass spectrometry, and NMR, Mössbauer, IR, and UV/Vis spectroscopy. The cage structures and UV/Vis spectra were independently confirmed by state-of-the-art DFT calculations. A remarkably high-spin-stabilizing effect through encapsulation of C70 was observed. The spin-transition temperature T1/2 is lowered by 20 K in the host-guest complex

Chromo- and Fluorogenic Organometallic Sensors

Compounds that change their absorption and/or emission properties in the presence of a target ion or molecule have been studied for many years as the basis for optical sensing. Within this group of compounds, a variety of organometallic complexes have been proposed for the detection of a wide range of analytes such as cations (including H+), anions, gases (e.g. O 2, SO2, organic vapours), small organic molecules, and large biomolecules (e.g. proteins, DNA). This chapter focuses on work reported within the last few years in the area of organometallic sensors. Some of the most extensively studied systems incorporate metal moieties with intense long-lived metal-to-ligand charge transfer (MLCT) excited states as the reporter or indicator unit, such as fac-tricarbonyl Re(I) complexes, cyclometallated Ir(III) species, and diimine Ru(II) or Os(II) derivatives. Other commonly used organometallic sensors are based on Pt-alkynyls and ferrocene fragments. To these reporters, an appropriate recognition or analyte-binding unit is usually attached so that a detectable modification on the colour and/or the emission of the complex occurs upon binding of the analyte. Examples of recognition sites include macrocycles for the binding of cations, H-bonding units selective to specific anions, and DNA intercalating fragments. A different approach is used for the detection of some gases or vapours, where the sensor's response is associated with changes in the crystal packing of the complex on absorption of the gas, or to direct coordination of the analyte to the metal centre

The synthesis of sensors

EThOS - Electronic Theses Online ServiceGBUnited Kingdo

A modular approach to luminescent dinuclear ruthenium(II) and rhenium(I) complexes

A series of dinuclear (bipyridine)tricarbonylrhenium(I) and tris(bipyridine) ruthenium(II) complexes have been isolated and characterised, bridged by a flexible diamido ethylene glycol chain. A new stepwise synthetic pathway has been investigated to heterometallic complexes, with the rhenium(I) complexes exhibiting an unusual configuration and inequivalence of the metal centres potentially arising from a surprising hydrogen-bonding interaction between an Re-CO group and an amide proton in low-polarity solvents. This interaction appears to be broken by competing hydrogen-bonding species such as dihydrogen phosphate. This effect was not observed in file corresponding ruthenium(II) complexes, which showed very little interaction with anions. The photophysical characterisation shows that the inclusion Of two ester/amide groups to the rhenium centre effectively quenches the fluorescence at. room temperature, The ruthenium(II) complexes have considerably stronger fluorescence than the rhenium species, and are less affected by the inclusion of ester and amide groups to the 2,2'-bipyridine chelating group, ((D Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheirn, Germany, 2008)

Kahlfrass in einer Saison

Der Buchsbaum-Zünsler wurde 2007 in die Schweiz eingeschleppt und verursacht dort vielerorts grosse Schäden an Buchsbäumen. Inzwischen ist es wohl nicht mehr möglich, den Falter vollkommen auszurotten. Ihn zu kontrollieren, ist dennoch wichtig, um Schäden zu vermeiden und um dessen weitere Ausbreitung einzudämmen. Am effizientesten ist dabei der Bacillus thuringiensis. Aber auch andere biologische Methoden können in der Zukunft das Arsenal erweitern

Comment contrer biologiquement cylindrocladium buxicola et volutella buxi

Après un premier article sur la lutte contre la pyrale du buis, nous traitons ici d'essais de lutte biologique contre les champignons cylindrocladium buxicola et volutella buxi

Le rouge cryptogamique, ça mange du pin

Des maladies fongiques des pins, le dépérissement des pousses dû à Sphaeropsis sapinea est le plus connu. Mais d’autres champignons peuvent causer des dépérissements à première vue semblables. Lophodermium seditiosum, agent de la maladie dite du «rouge cryptogamique» est l’un d’eux