[M(N3)2(H2O)2]⋅(bpeado): Unusual Antiferromagnetic Heisenberg Chain (M=Mn) and Ferromagnetic Ising Chain (M=Co) with Large Coercivity and Magnetic Relaxation (bpeado=1,2‐Bis(4‐pyridyl)ethane‐N,N′‐dioxide)

Contrasting magnetic properties : Two isostructural metal‐azido magnetic chains embedded in 3D threefold interpenetrated H‐bonded frameworks and separated by a long bpeado spacer have been assembled (see figure). Incorporation of Mn²⁺ displays a rarely observed antiferromagnetic Heisenberg chain, while incorporation of Co²⁺ displays a ferromagnetic Ising chain.

     

Halogen Bonding between an Isoindoline Nitroxide and 1,4‐Diiodotetrafluorobenzene: New Tools and Tectons for Self‐Assembling Organic Spin Systems

Radical assembly : Halogen bonding has been observed for the first time between an isoindoline nitroxide and an iodoperfluorocarbon (see figure), which cocrystallize to form a discrete 2:1 supramolecular compound in which N? O^.???I halogen bonding is the dominant intermolecular interaction. This illustrates the potential use of halogen bonding and isoindoline nitroxide tectons for the assembly of organic spin systems.

     

Functional Mesoporous Material Derived from 3D Net‐Linked SBA‐15

Caught in the net : Zirconia‐modified SBA‐15 mesoporous silica with a specific 3D net‐linked morphology (see picture) is prepared by using a facile method. This new functional material can trap particles in tobacco smoke and so can be applied towards environmental protection.

     

A Unified Strategy for the Stereospecific Construction of Propionates and Acetate–Propionates Relying on a Directed Allylic Substitution

Flexible friends : A new strategy that relies on o‐DPPB‐directed allylic substitution has been implemented for the flexible and stereospecific construction of major polyketide and isoprenoid structural elements (see scheme; o‐DPPB=ortho‐diphenylphosphanyl benzoate; PG=protecting group).

     

Catalytic Asymmetric Intramolecular Hydroarylations of ω‐Aryloxy‐ and Arylamino‐Tethered α,β‐Unsaturated Aldehydes

Economical approach : The first organocatalytic asymmetric intramolecular hydroarylation of phenol‐ and aniline‐derived enals offers one of the most straightforward and atom‐economic approaches to enantioriched chromans and tetrahydroquinolines (up to 96 % ee; see scheme).

     

Color Tunability and Electrochemiluminescence of Silver Nanoclusters

Colorful clusters : Silver nanoclusters consisting of only a few atoms exhibit large chemical‐environment‐responsive shifts of their optical absorption and emission bands, that is, large solvatochromism (see picture). The photophysical characteristics and electrochemiluminescence of the Ag clusters give them remarkable advantages over larger nanoparticles in applications such as molecular sensing.

     

Breaking the Dogma of the Metal‐Coordinating Carboxylate Group in Integrin Ligands: Introducing Hydroxamic Acids to the MIDAS To Tune Potency and Selectivity

A suitable substitute : All integrin receptors bind their ligands, which contain an aspartate residue, in the metal‐ion‐ dependent adhesion site (MIDAS). So far all attempts to replace the carboxyl group of aspartate with other, pharmacologically favorable isosteric groups have failed. Now it has been shown that a hydroxamic acid group can replace the carboxyl group; the resulting ligand retains its high binding activity. The picture shows one such ligand in the binding site of αvβ3.

     

A Powerful Chiral Counteranion Motif for Asymmetric Catalysis

Room to swing a cat : A chiral disulfonimide has been designed as a powerful new motif for asymmetric catalysis. As a first illustration, a highly efficient and enantioselective Mukaiyama aldol reaction has been developed (see scheme). The actual catalyst is proposed to be an N‐silyl imide which is generated in situ.