We report the synthesis and characterization of a fan-shaped chiral nanographene 1,which is composed of 6 hexabenzocoronene subunits with 216 conjugated carbon atoms.In the dehydrocyclization reaction,38 C–C bonds ar...We report the synthesis and characterization of a fan-shaped chiral nanographene 1,which is composed of 6 hexabenzocoronene subunits with 216 conjugated carbon atoms.In the dehydrocyclization reaction,38 C–C bonds are formed simultaneously.1 exhibits strong panchromatic absorption from the ultraviolet to the near-infrared,with an absorption coefficient of 209,000 L mol^(-1)cm^(-1)at 564 nm.Optically pure samples,obtained via chiral HPLC,show distinct ECD signals(|Δε|=704 L mol^(-1)cm^(-1)at 405 nm).Upon excitation,1 emits near-infrared fluorescence at 820 nm with a quantum yield of 5.5%.These photophysical properties of 1 were analyzed with the assistance of DFT calculations.展开更多
Nanographenes(NGs)are exceptionally hydrophobic.They are insoluble in water,preventing the exploration and utilization of their photophysical properties under aqueous conditions.This work discloses an atomically preci...Nanographenes(NGs)are exceptionally hydrophobic.They are insoluble in water,preventing the exploration and utilization of their photophysical properties under aqueous conditions.This work discloses an atomically precise water-soluble synthetic NG1,featuring a 2 nm sp^(2) carbon skeleton appended with 12 branched triethylene glycol chains.It synergistically combines low critical solution temperature(LCST)behavior and a photothermal effect to create the first thermo-and photo-responsive atomically precise NG functioning in an aqueous solution.The LCST behavior can be attributed to a delicate balance of hydrophobic-hydrophilic interactions,providing a sensitive thermal response to changes over a temperature range of physiological interest(close to 37℃).Moreover,1 has considerable photothermal conversion capability,with irradiation of 1 in water by red or near infrared light increasing the solutions temperature to above the clouding point within seconds,leading to a reversible clear-to-turbid transition over many cycles without evident fatigue.展开更多
We describe a janusarene derivative PyJ,which forms micrometer-scale one-dimensional metallo-supramolecular polymer through coordination driven self-assembly.PyJ is a well-preorganized dodecatopic pyridyl ligand built...We describe a janusarene derivative PyJ,which forms micrometer-scale one-dimensional metallo-supramolecular polymer through coordination driven self-assembly.PyJ is a well-preorganized dodecatopic pyridyl ligand built on a hexaphenylbenzene platform.The two-face structural feature of PyJ allows for a delicate control over multiple Py-Ag^(+)-Py coordination interactions,leading to assembled structure of PyJ-Ag^(+),which was characterized by dynamic light scattering,atomic force microscopy,and transmission electron microscopy.展开更多
基金supported by the National Natural Science Foundation of China(Nos.21871298,91956118)。
文摘We report the synthesis and characterization of a fan-shaped chiral nanographene 1,which is composed of 6 hexabenzocoronene subunits with 216 conjugated carbon atoms.In the dehydrocyclization reaction,38 C–C bonds are formed simultaneously.1 exhibits strong panchromatic absorption from the ultraviolet to the near-infrared,with an absorption coefficient of 209,000 L mol^(-1)cm^(-1)at 564 nm.Optically pure samples,obtained via chiral HPLC,show distinct ECD signals(|Δε|=704 L mol^(-1)cm^(-1)at 405 nm).Upon excitation,1 emits near-infrared fluorescence at 820 nm with a quantum yield of 5.5%.These photophysical properties of 1 were analyzed with the assistance of DFT calculations.
基金supported by the National Natural Science Foundation of China(21871298,91956118)the Sun Yat-Sen University。
文摘Nanographenes(NGs)are exceptionally hydrophobic.They are insoluble in water,preventing the exploration and utilization of their photophysical properties under aqueous conditions.This work discloses an atomically precise water-soluble synthetic NG1,featuring a 2 nm sp^(2) carbon skeleton appended with 12 branched triethylene glycol chains.It synergistically combines low critical solution temperature(LCST)behavior and a photothermal effect to create the first thermo-and photo-responsive atomically precise NG functioning in an aqueous solution.The LCST behavior can be attributed to a delicate balance of hydrophobic-hydrophilic interactions,providing a sensitive thermal response to changes over a temperature range of physiological interest(close to 37℃).Moreover,1 has considerable photothermal conversion capability,with irradiation of 1 in water by red or near infrared light increasing the solutions temperature to above the clouding point within seconds,leading to a reversible clear-to-turbid transition over many cycles without evident fatigue.
基金supported by the National Natural Science Foundation of China(Nos.21871298,91956118)the Sun Yat-sen University。
文摘We describe a janusarene derivative PyJ,which forms micrometer-scale one-dimensional metallo-supramolecular polymer through coordination driven self-assembly.PyJ is a well-preorganized dodecatopic pyridyl ligand built on a hexaphenylbenzene platform.The two-face structural feature of PyJ allows for a delicate control over multiple Py-Ag^(+)-Py coordination interactions,leading to assembled structure of PyJ-Ag^(+),which was characterized by dynamic light scattering,atomic force microscopy,and transmission electron microscopy.
