24225-51-2

Basic information

• Product Name: 7-bromo-9H-fluoren-2-ol
• CAS NO: 24225-51-2
• Molecular Formula: C₁₃H₉BrO
• Molecular Weight: 261.114
• Mol File: 24225-51-2.mol

Chemical Properties

• Boiling Point: 425.4°C at 760 mmHg
• Flash Point: 211°C
• Density: 1.602g/cm³
• Vapor Pressure: 7.77E-08mmHg at 25°C
• Refractive Index: 1.705
• CAS DataBase Reference: 7-bromo-9H-fluoren-2-ol(CAS DataBase Reference)
• NIST Chemistry Reference: 7-bromo-9H-fluoren-2-ol(24225-51-2)
• EPA Substance Registry System: 7-bromo-9H-fluoren-2-ol(24225-51-2)

Safety Data

• Hazardous Substances Data: 24225-51-2(Hazardous Substances Data)

Upstream product

• 34172-50-4 1-(7-bromo-9H-fluoren-2-yl)ethanone 
• 1133-80-8 2-bromo-9H-fluorene 
• 86-73-7 9H-fluorene 
• 113770-28-8 7-bromo-2-acetoxyfluorene 

Relevant articles and documents

Molecular engineering of organic sensitizers with planar bridging units for efficient dye-sensitized solar cells

Here comes the sun: Three highly efficient organic sensitizers with sterically hindered fluorenyl units and planar indenothiophene derivatives were designed and synthesized (see figure). Devices based on one of these compounds, JK-303, gave overall conversion efficiencies of 8.69, 9.04, 7.27, and 5.82 % using I-/I3-, CoII/CoIII, polymer gel, and solid-state electrolytes, respectively. These efficiencies are some of the highest reported for DSSCs based on organic sensitizers. Copyright

Nematic Mesophases in 9-Methyl and 9-Bromo-2-Fluorenyl 4-Alkoxybenzoates

The esters, 9-methyl-2-fluorenyl 4-alkoxybenzoates with C5, C7, C9, C11, and C14 chain lengths were synthesized in order to determine the effect of the 9-substituent in the fluorene rings on their mesomorphic properties.Their structures were determined by spectroscopic including methods 1H-NMR, 13C-NMR, and 2D-COSY-NMR.All these compounds showed a nematic phase with anematic-isotropic transition temperature between 74-100 deg C.The nematic phase in these materials could be supercooled to room temperature.The nematic phase also appeared in the corresponding 9-bromo esters but at higher temperatures and was enantiotropic only in one momolog, C9.Comparisons were also made with the 7-bromo-2-fluorenyl 4-alkoxybenzoates with C7, C9, and C14 chain lengths.These compounds all yielded the smectic A phase with the nematic phase only appearing in the C7 homolog.The presence of bromine in the 7-position of the fluorenyl esters increased the liquid crystal isotropic transition temperature to about 200 deg C.

Liquid crystals having a type A smectic phase

The invention relates to a group of organic compounds of the substituted 2-hydroxyfluorene ester type, which has a smectic A mesomorphous phase. The invention also relates to the process for producing molecules of this group. The compound according to the invention is in accordance with the general chemical formula STR1 whereby n can be between 1 and 15 and X=Br or CN. The invention applies to the field of liquid crystals and to display means using such crystals.