Search results for "iTED"

Über Germanium‐haltige Heterocyclen, IV. 2,2,4,4,6,6‐Hexaphenyl‐1,3,5‐trioxa‐2,4,6‐trigermacyclohexan, (Ph 2 GeO) 3 , eine monoplanare Zwischenstufe …

1982

Die Titelverbindung 1 wurde durch Hydrolyse von Ph2GeCl2 in acetonischer Losung gewonnen. Die Kristallstruktur wurde bestimmt und bis R = 0.049 verfeinert. Die Konformation des Ge3O3-6-Ringes ist monoplanar und bildet eine mogliche Zwischenstufe einerseits fur die Racemisierung von Twist-Wanne-Enantiomeren und andererseits bei der Sessel-Sessel-Inversion. Ein angeregter Zustand mit umlaufendem Null-Torsionswinkel wird als Alternative zur gangigen Lehrbuchdarstellung dieser Vorgange diskutiert. Die GeOAbstande und GeOGe-Winkel betragen 176–178 pm bzw. 128–130°. Die 1-Molekule sind im Kristall nach Art einer tetragonal-innenzentrierten Kugelpackung mit (10 + 4)-Koordination gepackt. On Hetero…

A New ZnIITweezer Pyridine-Naphthalene System - An Off-On-Off System Working in a Biological pH Window

2005

Their basic idea consisted of the connec-tion of an amine to a fluorophoric anthracene unit on oneside and to a pyridine moiety on the other. At acidic pHvalues the amino and the pyridine groups are protonatedand a photoinduced electron transfer (PET) occurs fromthe π-π* excited state of the anthracene to the protonatedpyridinium unit, leading to quenching of the fluorescence.However, at high pH values, where the amino group is notprotonated, PET alternatively takes place from the aminelone pair to the same excited state of the fluorophore, yield-ing the same inhibitory effect on the fluorescence. Betweenthese two pH values, there is a pH window where PET doesnot take place and fluorescence…

Light-induced excited spin-state trapping of the Fe(ppi)2(NCS)2 complex

1996

Insertion of a [Fe II (pyimH) 3 ] 2+ [pyimH = 2‐(1 H ‐Imidazol‐2‐yl)pyridine] Spin‐Crossover Complex Inside a Ferromagnetic Lattice Based on a Chiral…

2015

The insertion of the [FeII(pyimH)3]2+ [pyimH = 2-(1H-imidazol-2-yl)pyridine] spin-crossover complex into a ferromagnetic bimetallic oxalate network affords the hybrid compound [FeII(pyimH)3][MnIICrIII(ox)3]2·X (ox = C2O42–). This spin-crossover complex templates the growth of crystals formed by a chiral 3D oxalate network. The magnetic properties of this hybrid magnet show the coexistence of long-range ferromagnetic ordering at 4.5 K and a spin crossover of the intercalated [FeII(pyimH)3]2+ complex above 250 K. The compound presents a light-induced excited spin-state trapping (LIESST) effect below 60 K although with limited photoconversion (less than 8 %).

A Synthetic View of Different Concepts of Creditor Protection - Or a High-Level Framework for Corporate Creditor Protection

2006

Protection of corporate creditors has become an important topic within the European Union. At EU level, discussion has been sparked by widespread dissatisfaction with some very rigid and cumbersome provisions, and even with the whole concept of the Second Company Law Directive. At EU Member State level, three landmark decisions by the European Court of Justice — Centros, Uberseering, and Inspire Art — opened the way for an all-out competition between the different company forms provided for by national company laws. At both levels, albeit for different reasons, British company law — and in particular the absence of any legal capital in the private limited company — acts as the main driving …

The periodic reporting procedure of the United Nations System and the human right to water: opportunities and challenges

2020

A água é fundamental para a vida. Contudo, foi apenas nos anos 70 que o acesso a este bem começou a ser discutido, a nível internacional, como um direito humano. Antes disso, algumas Convenções e Tratados das Nações Unidas reconheciam, de alguma forma, o direito à água, mas tal direito tinha que ser inferido de outros direitos ou estava limitado à uma determinada categoria de pessoas. Independentemente das suas limitações, estes textos podem reforçar a aplicação do direito humano à água, especialmente através dos seus mecanismos de monitoramento: os relatórios periódicos e os casos litigiosos. Assim, o objetivo deste artigo é analisar em que medida o mecanismo de relatórios periódicos pode …

The EU’s Role in International Climate Change Policy-Making: A Global Leader in Decline?

2013

This chapter assesses the European Union’s (EU) role in international climate change policy-making by comparing the EU’s degree of goal attainment at the United Nations Framework Convention on Climate Change (UNFCCC) Conference of the Parties (COP) negotiations in Copenhagen in 2009 and Cancun in 2010. By making use of three analytical factors (coherence, the opportunity structure and politicisation) we assess the outcomes of both negotiations for the EU. The Durban negotiations of 2011 are touched upon in the conclusions.

Evolving Conceptualisations of Internationalism in the UK Parliament : Collocation Analyses from the League to Brexit

2020

This chapter explores a historical distant reading strategy of British Parliamentary discourse. It uses historical collocation analyses of ‘internationalism’ and the ‘international’ in the British Hansard Corpus and a selection of Commons and Lords debates concerning British membership in international organisations as it relates to the League of Nations, United Nations, Council of Europe, EEC and Brexit. The collocates that were deemed to be politically significant are grouped in 13 loose semantic fields. This macro-level analysis of long-term trends of discourse is supplemented with an analysis of the said key debates in their historical contexts, including comparisons between the two Hou…

Teaching and learning gross anatomy using modern electronic media based on the visible human project

2002

This article reviews online (Internet) anatomy projects and multimedia productions (books and CD-ROMs) based on the Visible Human Project (VHP) of the United States National Library of Medicine. The focus of these projects and productions is on the teaching of 3D anatomy using the digitized sections of the visible human male and female. The article also provides information about the VHP, its goals and what it has achieved thus far.

The Low-Lying Excited States of 2,2′-Bithiophene: A Theoretical Analysis

2004

The low-energy region of the singlet →singlet, singlet →triplet, and triplet→triplet electronic spectra of 2,2'-bithiophene are studied using multiconfigurational second-order perturbation theory (CASPT2) and extended atomic natural orbitals (ANO) basis sets. The computed vertical, adiabatic, and emission transition energies are in agreement with the available experimental data. The two lowest singlet excited states, 1 1 B u and 2'B u , are computed to be degenerate, a novel feature of the system to be borne in mind during the rationalization of its photophysics. As regards the observed high triplet quantum yield of the molecule, it is concluded that the triplet states 2 3 A g and 2 3 B u ,…