Chiroptical and magnetic properties of star-shaped Fe-4(III) complexes from chiral Schiff bases. Structural and magnetic correlations based on continuous shape measures

New chiral Fe-4(III) star-shaped complexes have been synthesized starting from enantiomerically pure Schiff bases and chiroptically and magnetically characterized. The structural and magnetic properties of the complete family of 40 Fe-4 complexes reported in the literature have been analyzed in the search for synthetic and magnetostructural correlations

2017 MEDAM assessment report on asylum and migration policies in Europe : sharing responsibility for refugees and expanding legal immigration

How can the responsibility for refugees be distributed more fairly – globally and within the EU? And how can we curb irregular migration while expanding legal immigration to the benefit of all concerned? The large number of refugees and other migrants who have come to Europe over the last two years has caused the EU member states that received most of the asylum seekers, to reach their capacity limits. With a view to new arrivals and their long-term integration, it is now necessary to develop new and, above all, common strategies to address the migration flows to Europe. The 2017 MEDAM Assessment Report focuses on two core messages: Distribute the responsibility for refugees more equitably and extending legal immigration from non-EU Member States into EU member states.This report was written by a team led by Matthias Lücke and comprising Esther Ademmer, Mehtap Akgüç, Mikkel Barslund, Anna Di Bartolomeo, David Benček, Dominik Groll, Rezart Hoxhaj, Mauro Lanati, Nadzeya Laurentsyeva, Lars Ludolph, Afaf Rahim, Rainer Thiele, Claas Schneiderheinze, Tobias Stöhr, and Alessandra Venturini

Na2MnIII6 LnIII clusters with a non-equivalent core: chiral vs. meso isomerism

A wide family of clusters with the Na2MnIII6 LnIII core derived from an enantiomerically pure or a racemic mixture of Schiff bases lead to the characterization of a unique case of chiral/meso isomers with C3/D3d symmetry respectively, involving the rearrangement of the cluster bond parameters and the change from hepta- to hexacoordination of the central LnIII cation

Linked Nickel Metallacrowns from a Phosphonate/2-Pyridyloximate Blend of Ligands: Structure and Magnetic Properties

In the present work, four new NiII clusters with nuclearities ranging between Ni4 and Na2Ni8 were synthesized, employing the versatile ligand phenylphosphonate and 6-methylpyridylaldoximate as the coligand. Crystallographic data show that the tetranuclear complex [Ni 4 (6-MepaoH)4(PhPO3)2(OH)2(MeOH)4](OH)2 (1) consists of two dimers linked by phosphonate bridges, whereas [Cs2Ni6(6-Mepao)6(PhPO3)3(OH)2(H2O)8] (2), Cs[Ni8(6-MepaoH)6(6-Mepao)6(PhPO3)3](ClO4)5 (3), and [Ni8Na2(BzO)6(6-Mepao)6(PhPO3)3] (4) are built from phosphonato-linked {Ni3(6-Mepao)3} metallacycles. The [9-MCNiII(6‑Mepao)-3] fragments in 2−4 show the unusual coordination of additional Cs+, Na+ , and/or NiII cations. Direct-current magnetic measurements were carried in the 300−2 K range. Analysis of the experimental data revealed a complex response with strong antiferromagnetic interactions mediated by the oximato bridges and weak interactions mediated by the phosphonate ones

Decanuclear FeIII clusters with hemiacetal ligands: a new{M10(μ3-O)8} cluster core

The characterization of a decanuclear FeIII cluster with α-methyl- 2-pyridinemethanolate, generated by the hydrolysis of Schiff bases, inspired us to carry out an initial exploration of the direct syntheses of medium nuclearity FeIII clusters starting from aldehydes in methanolic medium. The new complexes exhibit an unprecedented {Fe10(μ3-O)8} cluster core

Chiral Oxazolidine Complexes Derived from Phenolic Schiff Bases

Schiff bases derived from pyridyl- or salicyl-aldehydes and aminoalcohols can evolve to heterocyclic oxazolidines, which in the presence of cations allow the formation of uncommon coordination compounds. In this work, we report new NiII and mixed valence MnII/ MnIV complexes derived from pyridyl oxazolidines and the unprecedented characterization of enantiomerically pure oxazolidines derived from the condensation of o-vanillin with phenylglycinol in the presence of NiII cations. The different reactivity of the pyridinic or phenolic Schiff bases has been compared, and the new systems have been structurally, optically, and magnetically characterized

Chiral Versus Non-Chiral [MnIII6MnIINaI], [MnIII6MnII2NaI2] and [MnIII 3MnIINaI] Clusters Derived from Schiff Bases or the Fight for Symmetry

The reaction in basic media of manganese chloride with Schiff bases derived from the condensation of ovanillin with different chiral/racemic aminoalcohols yielded in a family of complexes in which the nuclearity, symmetry and magnetic behavior is controlled by changing the position of the chiral carbon. Chiral and racemic clusters with [MnIII6MnIINaI], [MnIII6MnII2NaI 2] and [MnIII3MnIINaI] metallic core have been structurally and magnetically characterized. The racemic clusters with an odd number of chiral ligands exhibit the anomalous mixing of ligands with different conformation. Related racemic compounds have been reviewed