form kinetically produces the bis(o-quinoidal) form followed by the thermal isomerization to the thermodynamically stable p-quinoidal form. These dynamic spin–spin interactions along with the rearrangement of chemical bonds will give a deeper understanding of the singletbiradicaloids and that to bridge organic multiradicals in molecular systems to cooperative spin behaviors in bulk materials.
Binding and Sensing Properties of a Hybrid Naphthalimide–Pyrene Aza-Cyclophane towards Nucleotides in an Aqueous Solution
作者:Aleksandr M. Agafontsev、Aleksandr S. Oshchepkov、Tatiana A. Shumilova、Evgeny A. Kataev
DOI:10.3390/molecules26040980
日期:——
triphosphate) and CTP (cytidine triphosphate) with a “turn-on” fluorescence response. Two separate emission bands of dyes allow one to detect nucleotides in a ratiometric manner in a broad concentration range of 10−5–10−3 M. Spectroscopic measurements and quantum chemical calculations suggest the formation of receptor–nucleotide complexes, which are stabilized by dispersion interactions between a nucleobase
Catalytic Asymmetric Synthesis of Silicon‐Stereogenic Dihydrodibenzosilines: Silicon Central‐to‐Axial Chirality Relay
作者:Yonghong Guo、Meng‐Meng Liu、Xujiang Zhu、Liru Zhu、Chuan He
DOI:10.1002/anie.202103748
日期:2021.6.14
A Rh-catalyzed asymmetricsynthesis of silicon-stereogenic dihydrodibenzosilines featuring axially chiral 6-membered bridged biaryls is demonstrated. In the presence of a RhI catalyst with a chiral diphosphine ligand, a wide range of dihydrodibenzosilines containing both silicon-central and axial chiralities are conveniently constructed in excellent enantioselectivities via dehydrogenative C(sp3)−H