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The design and synthesis of two families of molecular gears prototypes is reported, with the aim of assembling them into trains of gears on surface and ultimately achieving controlled intermolecular gearing motion. These piano-stool ruthenium complexes incorporate a hydrotris(indazolyl)borate moiety as tripodal rotation axle and a pentaarylcyclopentadienyl ligand as star-shaped cogwheel, equipped with five teeth ranging from pseudo 1-dimensional aryl groups to large planar 2-dimensional paddles. A divergent synthetic approach was followed, starting from a penta(p-bromophenyl)cyclopentadienyl ruthenium(II) complex as key precursor or from its iodinated counterpart, first obtained by copper-catalyzed aromatic Br/I exchange. Subsequent five-fold cross-coupling reactions with various partners allowed high structural diversity to be reached, yielding molecular gears prototypes displaying aryl-, carbazole-, BODIPY- and porphyrin-derived teeth of increasing size and length.
This article was published in the following journal.
Name: Chemistry (Weinheim an der Bergstrasse, Germany)
Ditriptycilmethanes are known as molecular bevel gears because the two triptycil groups show correlated rotation. In this report, molecular bevel gears bridged with a group 14 element, bis(methyltript...
In this contribution we show that star-shaped gold nanoparticles and star-shaped nanostructures containing a gold core (Au@SiO, Au@Ag, and Au@Ag@SiO) can be used as very efficient, easy to produce and...
The aim was to compare the shaping ability of different rotary nickel-titanium instruments in simulated S-shaped canals. One hundred S-shaped canals in resin blocks were prepared to an apical size 25 ...
Heteroatom-doped graphene-based materials attract great interest as non-metal electrocatalysts for the oxygen reduction reaction (ORR). In this work, a straightforward approach was described to prepar...
The comprehensive branching analysis of complex polymers is still a challenge in advanced polymer analysis. Average branching information (average number and length of branches) can be obtained by spe...
The study investigates the performance of a new dialyzer (Theranova 400) containing a membrane with increased pore sizes. The performance will be determined by the removal of middle molecu...
To evaluate the effectiveness and safety of catheter ablation of frequent symptomatic PVCs in the pediatric population as first-line therapy compared with antiarrhythmic drugs.
The study will include a single ascending dose approach to evaluate the safety, tolerability, and pharmacokinetic properties of STAR-101 after a single oral administration in healthy parti...
This is a single center, single arm, open-lable phase I study to determine the safety and efficacy of CD19-STAR-T cells in patients with refractory and relapsed B-cell malignancies (such a...
The aim of this study is to investigate the prevalence and configuration of C-shaped root canal of mandibular first and second molars among members of an Egyptian sub-population using cone...
Unstable isotopes of ruthenium that decay or disintegrate emitting radiation. Ru atoms with atomic weights 93-95, 97, 103, and 105-108 are radioactive ruthenium isotopes.
Inorganic compounds that contain ruthenium as an integral part of the molecule.
An inorganic dye used in microscopy for differential staining and as a diagnostic reagent. In research this compound is used to study changes in cytoplasmic concentrations of calcium. Ruthenium red inhibits calcium transport through membrane channels.
Star-shaped, myofibroblast-like cells located in the periacinar, perivascular, and periductal regions of the EXOCRINE PANCREAS. They play a key role in the pathobiology of FIBROSIS; PANCREATITIS; and PANCREATIC CANCER.
A class of large neuroglial (macroglial) cells in the central nervous system - the largest and most numerous neuroglial cells in the brain and spinal cord. Astrocytes (from "star" cells) are irregularly shaped with many long processes, including those with "end feet" which form the glial (limiting) membrane and directly and indirectly contribute to the BLOOD-BRAIN BARRIER. They regulate the extracellular ionic and chemical environment, and "reactive astrocytes" (along with MICROGLIA) respond to injury.
Dentistry is the study, management and treatment of diseases and conditions affecting the mouth, jaw, teeth and their supporting tissues (Oxford Medical Dictionary) The work of a dentist ranges from regular patient check-up to orthodontics and surgery....