2-methoxy-9H-carbazole丨CAS 6933-49-9

2-methoxy-9H-carbazole丨CAS 6933-49-9 is an organic compound with the molecular formula C13H11NO. It is a substituted derivative of carbazole, featuring a methoxy (-OCH₃) group at the 2-position of the carbazole framework. Carbazole-based molecules are known for their excellent photophysical, electronic, and thermal properties, making them valuable in a range of high-performance materials.

1. Organic Electronics and Optoelectronic Devices
a. Organic Light-Emitting Diodes (OLEDs):
2-methoxy-9H-carbazole丨CAS 6933-49-9, as a substituted carbazole, is used as a building block or intermediate for materials used in OLEDs. The methoxy substitution enhances electron-donating ability and modifies photophysical characteristics, improving hole-transporting properties and film-forming ability.
● Hole Transport Layers (HTLs): It can serve directly or via further derivatization as a hole transport material due to its high thermal stability and HOMO level alignment.
● Emissive Layer Materials: Derivatives of 2-methoxy-9H-carbazole may be used in host–guest systems where they support efficient energy transfer to dopants.
b. Organic Photovoltaics (OPVs):
In organic solar cells, carbazole-based compounds function as donor materials due to their planar structures and ability to facilitate π-π stacking. 2-Methoxy-9H-carbazole derivatives can be incorporated into small molecules or polymers to improve light absorption and charge mobility.
c. Organic Field-Effect Transistors (OFETs):
2-methoxy-9H-carbazole丨CAS 6933-49-9 can be used as a precursor to high-performance semiconducting polymers or small molecules in OFETs. The methoxy group contributes to solubility and facilitates post-synthetic modifications.

2. Pharmaceutical and Medicinal Chemistry
Carbazole derivatives possess a wide range of biological activities. While 2-methoxy-9H-carbazole itself may not be a drug candidate, it serves as a synthetic intermediate for pharmaceutical compounds with potential:
● Anticancer
● Antibacterial
● Antiviral
● Anti-inflammatory
Researchers use it in combinatorial chemistry to generate libraries of biologically active molecules by functionalizing the carbazole core. Its electron-rich nature and reactive nitrogen make it suitable for diverse modifications (e.g., forming amides, alkylation, halogenation).

3. Dye and Pigment Industry
Due to the extended conjugated π-system and electron-donating methoxy group, 2-methoxy-9H-carbazole can be a precursor for dye molecules. Its derivatives can be used in:
● Fluorescent probes
● Dye-sensitized solar cells (DSSCs)
● Photostable pigments
The compound's structure supports strong fluorescence and UV absorption, making it useful in functional dyes.

4. Material Science and Polymers
2-Methoxy-9H-carbazole can be polymerized or used in copolymers to develop advanced functional materials:
● Electroactive polymers with applications in sensors and capacitors.
● Thermal-resistance materials thanks to the carbazole core's rigidity.
● Photoconductive materials for use in xerographic applications or photorefractive polymers.
The methoxy group may improve polymer solubility and processability, making the compound useful in solution-processable electronic materials.

5. Chemical Research and Synthesis
In synthetic organic chemistry, 2-methoxy-9H-carbazole is valuable as:
● A key intermediate in cross-coupling reactions (e.g., Suzuki, Buchwald–Hartwig).
● A starting point for creating structurally diverse carbazole-based ligands.
● A reactive scaffold for supramolecular or coordination chemistry.
Its rigid tricyclic framework and reactive sites enable complex chemical transformations and novel molecular design.

1. Tunable Electronic Properties
The presence of a methoxy group at the 2-position introduces a strong electron-donating effect, enabling fine-tuning of HOMO-LUMO levels in electronic applications. This makes it suitable for custom-designed optoelectronic materials.
2. High Thermal and Photochemical Stability
Carbazole-based compounds, including 2-methoxy-9H-carbazole, are renowned for their thermal stability. This is essential in OLED and OPV applications where devices must withstand heat during operation and fabrication.
3. Versatile Chemistry
It is highly amenable to derivatization, allowing chemists to introduce a wide variety of functional groups. This synthetic flexibility supports its application in fields ranging from drug design to materials science.
4. Enhanced Solubility
The methoxy substitution often enhances solubility in organic solvents, which facilitates solution-based processing-a crucial requirement for low-cost manufacturing of printed electronics.
5. Photophysical Functionality
The compound shows promising fluorescence properties, making it attractive for photonic and bioimaging applications. It can serve as a core or substituent in luminophores for chemical sensing and fluorescence-based assays.

2-methoxy-9H-carbazole丨CAS 6933-49-9 is a structurally significant compound that finds applications in diverse advanced fields, from OLEDs and solar cells to drug development and materials chemistry. Its unique combination of electronic properties, structural rigidity, and synthetic flexibility makes it a valuable component in both academic research and industrial product development. As material science and organic electronics continue to evolve, the role of such carbazole derivatives is expected to grow in importance.