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Highlights from the article: B Synthesis through Organometallics b : This Special Issue is in honor of the 20th IUPAC International Symposium on Organometallic Chemistry directed towards Organic Synthesis (OMCOS 20), which will be held in Heidelberg, Germany, on July 21-25, 2019. Contributions include Review-type and Research articles (Full Papers and Communications) from speakers of the OMCOS symposium (past and present) as well as members of the OMCOS board. B Synthesis through Organometallics b : This Special Issue is in honor of the 20th IUPAC International Symposium on Organometallic Chemistry directed towards Organic Synthesis (OMCOS 20), which will be held in Heidelberg, Germany, on July 21-25, 2019.

Solid ‐ state incorporation of a single ‐ ion magnet (SIM) within the pores of a magnetic 3D metal – organic framework (MOF) in a single ‐ crystal to single ‐ crystal process has been demonstrated. The resulting host – guest supramolecular aggregate affords the first deep study on the interplay of the internal magnetic field of the MOF and the slow magnetic relaxation of the SIM allowing the observation of a partial suppression of the quantum ‐ tunneling effects operative in the SIM. More information can be found in the Full Paper by D. Armentano, E. Pardo et al. on page 539 ff. [ABSTRACT FROM AUTHOR]

Multifunctional tri(carbazole – triazole) macrocycles were prepared in a one ‐ pot synthesis. They can be adsorbed from solution onto graphite surfaces and into well ‐ ordered stacked films under the direction of lateral hydrogen bonding, co ‐ facial stacking interactions, and steric contacts. Anion ‐ binding affinity arising from CH hydrogen bonds directed into the central cavity is active in both solution and the adsorbed states; anion ‐ binding events modify the film structure. More information can be found in the Full Paper by S. L. Tait, A. H. Flood et al. on page 560 ff. [ABSTRACT FROM AUTHOR]

Two distinct “light switch” molecules are turned on in the presence of different G ‐ quadruplex DNA structures. When irradiated with visible light, the photochemical “light switch” undergoes selective ligand loss when bound to mixed ‐ hybrid G ‐ quadruplex DNA, followed by DNA metalation. The photophysical “light switch” brightly emits when bound to parallel G ‐ quadruplex DNA. More information can be found in the Full Paper by E. C. Glazer et al. on page 550 ff. [ABSTRACT FROM AUTHOR]

Stormy gels containing single ‐ walled carbon nanotubes as fillers: are ionic liquids the unique solvents able to accomplish this task? This work exploits a non ‐ ionic surfactant and a triblock copolymer as alternative dispersants to a well ‐ known ionic liquid. Impedance and rheological measurements highlight the formation of electrically conductive gels by adding nanotubes to the selected solvents. More information can be found in the Full Paper by G. Angelini et al. on page 546 ff. [ABSTRACT FROM AUTHOR]

The author reflects on the European Young Chemist Award (EYCA). He mentions its establishment in 2005 at the conferences of the European Association for Chemical and Molecular Sciences (EuCheMS). He also notes its requirement for eligibility which needs applicants at age 35 as well as documents of their research, support letters and Curriculum Vitae.

A reverse indenyl effect occurs in the acetylene [2+2+2] cyclotrimerization to benzene by RhI half‐metallocene catalysts with heteroaromatic ligands. In their Full Paper on page 13337 ff., L. Orian, F. M. Bickelhaupt et al. have designed, in silico, heteroaromatic ligands that are isoelectronic to the classic hydrocarbon cyclopentadienyl and indenyl anions. Mechanistic explorations and activation strain analyses reveal and explain the reverse indenyl effect, that is, a decrease in reactivity associated with an increased metal slippage. On the cover, the initial bis‐ acetylene complexes of all ligands are shown: the different extent of Rh slippage controls the orientation of the alkynes, which resembles the pose of the wings of Siproeta stelenes, the Central American butterfly shown. [ABSTRACT FROM AUTHOR]

A low‐temperature plasma‐irradiation route  was developed to fabricate crack‐free and homogenous thin films of porous SnO2. In their Full Paper on page 13387 ff., Y. Li, W. Cai, and co‐workers show that these thin films exhibit a more homogenous structure, fewer cracks, and hence a much lower resistance than thin films generated by standard annealing methods, and consequently have enhanced gas‐sensing properties. [ABSTRACT FROM AUTHOR]

Keywords: charge density investigation; computational chemistry; cobalt phosphate; density of states; solid-state catalysis Charge density investigation, computational chemistry, cobalt phosphate, density of states, solid-state catalysis. [Extracted from the article]

The guanine nucleobase aggregates into tetrameric or different ribbon structures on surfaces or in solution. The preference of guanine for a particular ribbon structure over other arrangements under experimental settings is explained quantum chemically. An important cooperative effect of the σ electronic system in the hydrogen bonding is revealed for the switching between different self‐assembled structures. More information can be found in the Full Paper by C. Fonseca Guerra and G. Paragi on page 3042 ff. [ABSTRACT FROM AUTHOR]

Mono‐ and bimetallic cadmium(II) porphyrin complexes show dynamic behavior relying on a reversible metal‐to‐N‐core interaction. In the bimetallic complex, a rare coupled intraligand migration of the two cations, resembling the motion of spheres in a “two‐ball” Newton's cradle device, is triggered by acetate anions (allosteric control). The cations concomitantly switch between the strap and porphyrin binding sites, while staying on their respective side of the ligand. For more information see the Full Paper by S. Le Gac, B. Boitrel et al. on page 13376 ff. [ABSTRACT FROM AUTHOR]

Azoles reacting in tandem: The ortho‐stereodirecting effect is the key to the stereoselective synthesis of (Z)‐N‐alkenylazoles I through the tosylhydrazide‐mediated Pd‐catalyzed cross‐coupling reaction of α‐N‐azoleacetophenones with ortho‐substituted aryl halides and nonaflates (see scheme). Additionally, the preorganization of the alkene allowed for the development of an auto‐tandem reaction involving an intramolecular CH arylation leading to pyrroloisoquinolines II. [ABSTRACT FROM AUTHOR]

Self‐sorting species: Nonlinear effects are observed in asymmetric hydrogenation reactions if self‐sorted dinuclear complexes are generated. The nature of the substrate also influences this effect, because it affects the solubility of racemic self‐sorted homochiral dinuclear complexes (see scheme). [ABSTRACT FROM AUTHOR]