Crystal structure of 3,13-dimethoxy-5,6,10,11-tetrahydrofuro[3,4-i][5]helicene-7,9-dione

Abstract

In the crystal, the mol­ecules form a layered structure parallel to (10) via C—H⋯O hydrogen-bonding inter­actions. Adjacent layers are also linked by C—H⋯O hydrogen bonds, forming a three-dimensional structure.

Dual-Analyte Fluorescent Sensor Based on [5]Helicene Derivative with Super Large Stokes Shift for the Selective Determinations of Cu2+ or Zn2+ in Buffer Solutions and Its Application in a Living Cell

“…In a 25 mL round-bottom flask, ethanolamine (0.099 g, 1.63 mmol) was dissolved in dimethylformamide (5.0 mL). A compound M201 (which was prepared according to our previous works) was added into the mixture with glacial acetic acid (0.5 mL, 8.74 mmol) as cosolvent. The reaction mixture was heated up to 110 °C for 24 h under Ar gas atmosphere.…”

“…[5]­Helicene derivatives were mostly hydrophobic and have been utilized in organic light emitting diodes (OLEDs) applications because of their high thermal stability, high emission signal in visible wavelength (500–600 nm), and high quantum yield. Moreover, they also possessed a large Stokes shift, resulted in the reduce of the effect of self-absorption as well as the interference from the light source . This will greatly help to reduce the cost of an optical device for on-site analysis.…”

Environmentally Friendly Ag+ Detection of “Turn-on” Fluorescent Sensor with a Mega-Stokes Shift and Its Application in Biological Systems

“…M201 was synthesized using the same synthetic route as in a previous report. 23 Concisely, a Diels-Alder reaction of diene and maleic anhydride, followed by oxidation via 2,3-dichloro-5,6-dicyano-1,4benzoquinone (DDQ) afforded M201 in 31% yield. 15.00 g, 36.00 mmol) and pyridine hydrochloride (63.00 g, 54.60 mmol) were mixed together in a 100 mL round bottom flask and stirred at 220°C for 6 hours.…”

Columnar Organization of Carbo[5]helicene Directed by Peripheral Steric Perturbation

“…One-dimensionally stacked chiral columnar organizations of [ n ]­CHs are quite intriguing due to their unique chiroptical properties in the crystalline state. − However, [ n ]­CH molecules commonly adopt noncolumnar herringbone arrangements as a result of preferable intermolecular CH−π interactions, which are more favorable than π–π stacking interactions in the crystalline state. − Therefore, it remains a significant scientific challenge to establish the one-dimensionally stacked columnar organization of [ n ]­CHs and thus overcome undesired intermolecular CH−π interactions.…”