Polymorph-Dependent Solid-State Fluorescence and Selective Metal-Ion-Sensor Properties of 2-(2-Hydroxyphenyl)-4(3H)-quinazolinone
摘要:
Abstract2‐(2‐Hydroxy‐phenyl)‐4(3H)‐quinazolinone (HPQ), an organic fluorescent material that exhibits fluorescence by the excited‐state intramolecular proton‐transfer (ESIPT) mechanism, forms two different polymorphs in tetrahydrofuran. The conformational twist between the phenyl and quinazolinone rings ofHPQleads to different molecular packing in the solid state, giving structures that show solid‐state fluorescence at 497 and 511 nm.HPQalso shows intense fluorescence in dimethyl formamide (DMF) solution and selectively detects Zn2+ and Cd2+ ions at micromolar concentrations in DMF. Importantly,HPQnot only detects Zn2+ and Cd2+ ions selectively, but it also distinguishes between the metal ions with a fluorescence λmax that is blue‐shifted from 497 to 420 and 426 nm for Zn2+ and Cd2+ ions, respectively. Hence, tunable solid‐state fluorescence and selective metal‐ion‐sensor properties were demonstrated in a single organic material.
Palladium-Catalysed and Phosphine-Promoted Synthesis of Diaryl Ethers through Self-Coupling
作者:Dawei Wang、Zhaojun Xu、Xiaoli Yu、Yongliang Li、Huida Wan
DOI:10.3184/174751916x14768086301069
日期:2016.11
An efficient, palladium acetate-catalysed, tributylphosphine-promoted direct synthesis of symmetrical diarylethers through the self-coupling of aryl fluorides has been developed with K2CO3/ZrO2 as a base. This provides an alternative method to prepare aromatic polymers, important synthetic intermediates and natural products for use in the field of pharmaceuticals and industrial materials.
Diaryl Ether Formation Merging Photoredox and Nickel Catalysis
作者:Le Liu、Cristina Nevado
DOI:10.1021/acs.organomet.1c00018
日期:2021.7.26
Photoredox and Ni catalysis are combined to produce diaryl ethers under mild conditions. A broad range of aryl halides and phenol derivatives are cross-coupled in the presence of a readily available organic photocatalyst and NiBr2(dtbpy). Symmetrical diaryl ethers have also been directly obtained from aryl bromides in the presence of water. Mechanistic investigations support the involvement of Ni(0)
Diaminotriazine substituted diphenyl ether: reversible structural transformation and solvent dependent solid state fluorescence
作者:Savarimuthu Philip Anthony、Sunil Varughese
DOI:10.1039/c3ce00014a
日期:——
The effect of molecular shape and position of hydrogen bonding functionality in the solid state structural self-assembly was investigated using diaminotriazine substituted diphenyl ether based positional isomers (1–5). The molecular shape was modulated by changing diaminotriazine position that produced channel supramolecular structures in 1, 3 and 5. There exists a direct correlation between the molecular
A structurally versatile coordination polymer: demonstrating spontaneous resolution, conformational polymorphism and gel formation
作者:Savarimuthu Philip Anthony、Longsheng Wang、Sunil Varughese、Sylvia M. Draper
DOI:10.1039/c3ce41224e
日期:——
Conformationally flexible C2-symmetric 2-(2′-cyanophenoxy) benzonitrile (O,O-CPBN) was self-assembled using silver ions into spontaneously resolved, helical and coordination polymer gel structures including unprecedented four different ligand conformation in a single polymer network structure.