Solid-State Photoswitching of Hydrazones Based on Excited-State Intramolecular Proton Transfer.

The development of new photochromic systems is motivated by the possibility of controlling the properties and functions of materials with high spatial and temporal resolution in a reversible manner. While there are several classes of photoswitches operating in solution, the design of systems efficiently operating in the solid state remains highly challenging, mainly due to limitations related to confinement effects. Triaryl-hydrazones represent a relatively new subclass of bistable hydrazone photoswitches exhibiting efficient / photochromism in solution.

Cationic -Tricarbollide μ-10,11-H-10,11-H-7-MeN--7,8,9-CBH and Its Halogenated Derivatives: The Slow Iodination Process Occurring through Cationic Iodonium Tricarbollides.

A series of -tricarbollides based on 10,11-X-7-MeN--7,8,9-CBH (X = H, Cl, Br, I) and their protonated, i.e. cationic, counterparts, which have an extra H-bridge over the B10-B11 vector in the open pentagonal belt, were prepared.

Single Step Synthesis of Non-symmetric Azoarenes Using Buchwald-Hartwig Amination.

Aromatic azo compounds stand as a highly sought-after class of substances owing to their extensive array of applications across various fields. Despite their significance, their synthesis often presents challenges, requiring either multistep reactions or being restricted to specific substrate types. In this study, we are showing the universality and mechanistic aspects of a one-step approach for synthesis of nonsymmetrical azoarenes via the Buchwald-Hartwig amination reaction of (pseudo)haloaromatics with arylhydrazines, conducted in the presence of atmospheric oxygen.

Redox Cycling with Tellurium. Si-H Bond Activation by a Lewis Superacidic Tellurenyl Cation.

The C,N-chelated aryltellurenyl triflate [2-(tBuNCH)CHTe][OTf] (1) activates the Si-H bonds in the tertiary silanes RSiH via umpolung of H to H to give rise to the iminium salts (tBuN(H)CH)CHTeSiR][OTf] (2, R=Et, Ph (elusive) and R=Si(CH) isolated; OTf=OSCF) comprising Te-Si bonds, which are capable of generating silyl triflates, RSiOTf, under attack of a second equivalent of 1. The unprecedented Si-H activation was utilized in main group redox catalysis using p-quinones, which were converted into (silylated) hydroquinones.

Antimony centre in three different roles: does donor strength or acceptor ability determine the bonding pattern?

A set of antimony(III) compounds containing a ligand (Ar) with a pendant guanidine function (where Ar = 2-[(MeN)CN]CH) was prepared and characterized. This includes triorgano-Ar3Sb, diorgano-Ar2SbCl and monoorgano-ArSbCl2 compounds and they were characterized by H and C NMR spectroscopy and by single-crystal X-ray diffraction analysis (sc-XRD). The coordination capability of Ar3Sb and Ar2SbCl was examined in the reactions with either -[PdCl(CHCN)] or PtCl and complexes -[(κ-Sb,N-Ar3Sb)MCl] (M = Pd 1, Pt 2) and [(κ-N,Sb,N-Ar2SbCl)MCl] (M = Pd 3, Pt 4) were isolated, while their structures were determined by sc-XRD.