Synthesis of -CN- linked covalent organic frameworks: Via the direct condensation of acetals and amines
We demonstrate herein a facile approach for constructing -CN- linked COFs from acetals. Three new COFs (imine-linked LZU-20, hydrazone-linked LZU-21, and azine-linked LZU-22) were synthesized by the direct condensation of dimethyl acetals and amines. All
An Autocatalytic System of Photooxidation-Driven Substitution Reactions on a FeII4L6 Cage Framework
The functions of life are accomplished by systems exhibiting nonlinear kinetics: autocatalysis, in particular, is integral to the signal amplification that allows for biological information processing. Novel synthetic autocatalytic systems provide a foundation for the design of artificial chemical networks capable of carrying out complex functions. Here we report a set of FeII4L6 cages containing BODIPY chromophores having tuneable photosensitizing properties. Electron-rich anilines were observed to displace electron-deficient anilines at the dynamic-covalent imine bonds of these cages. When iodoaniline residues were incorporated, heavy-atom effects led to enhanced 1O2 production. The incorporation of (methylthio)aniline residues into a cage allowed for the design of an autocatalytic system: oxidation of the methylthio groups into sulfoxides make them electron-deficient and allows their displacement by iodoanilines, generating a better photocatalyst and accelerating the reaction.
Neelakandan, Prakash P.,Jiménez, Azucena,Thoburn, John D.,Nitschke, Jonathan R.
Self-assembly of a trigonal bipyramidal architecture with stabilisation of iron in three spin states
Self-assembly and characterisation of a supramolecular trigonal bipyramidal iron cage containing an [FeIII(μ2-F)6(FeII)3]3+ star motif at its core is reported. The complex can be formed in a one step reaction using an heterotopic ligand that supports site-specific incorporation of iron in three distinct electronic configurations: low-spin FeII, high-spin FeII and high-spin FeIII, with iron(ii) tetrafluoroborate as the source of the bridging fluorides. Formation of a μ2-F bridged mixed-valence FeII-FeIII star is unprecedented. The peripheral high-spin FeII centres of the mixed-valence tetranuclear star incorporated in the iron cage are highly anisotropic and engage in F-mediated antiferromagnetic exchange with the central FeIII ion.
Borilovi?, Ivana,Riddell, Imogen A.,Taylor, Lauren L. K.,Tuna, Floriana,Vitorica-Yrezabal, I?igo J.
supporting information
p. 11252 - 11255
(2021/11/04)
VINYL COMPOUNDS AS FGFR AND VEGFR INHIBITORS
FGFR and VEGFR inhibitors are provided, and compounds represented by formula (1) or formula (II) as FGFR and VEGFR inhibitors, pharmaceutically acceptable salts or tautomers thereof are specifically disclosed.
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(2018/06/23)
Fluorescent BODIPY-based Zn(II) complex as a molecular probe for selective detection of neurofibrillary tangles in the brains of Alzheimer's disease patients.
We have developed a new fluorescent binuclear Zn(II) complex for the detection of neurofibrillary tangles (NFTs) of hyperphosphorylated tau proteins, a representative hallmark of Alzheimer's disease (AD). The probe 1 incorporates a fluorescent BODIPY unit