Description

3,3-Diphenyl-3H-naphtho[2,1-b]pyran is a specialized organic compound belonging to the class of photochromic naphthopyrans. This chemical matters for its unique ability to undergo a reversible color change upon exposure to specific wavelengths of light, making it a critical functional material. It is primarily needed by manufacturers in the advanced materials, optical lens, and smart window industries for developing light-responsive products.

Application

• Photochromic Lens Manufacturing: As a key organic photochromic dye for ophthalmic lenses and sunglasses that darken upon UV exposure.
• Smart Window & Glass Coatings: For formulating coatings and films that adjust light transmission in architectural and automotive applications.
• Optical Data Storage: As a potential component in materials for high-density, light-writable data storage media.
• Security Inks & Anti-Counterfeiting: Utilized in inks for banknotes, documents, and product packaging that reveal hidden marks under specific light.
• Novel Sensor Development: In research and development of chemical sensors that respond optically to environmental stimuli.
• Organic Synthesis Intermediate: Serves as a building block for synthesizing more complex photochromic molecules and functional dyes.

Basic Information

Product Name	3,3-Diphenyl-3H-naphtho[2,1-b]pyran
CAS No.	4222-20-2
Molecular Formula	C27H18O
Molecular Weight	358.43 g/mol
Synonyms	3,3-Diphenyl-3H-naphtho[2,1-b]pyran; 3,3-Diphenyl-3H-naphtho[2,1-b]pyran; Naphtho[2,1-b]pyran, 3,3-diphenyl-3H-; 3H-Naphtho[2,1-b]pyran, 3,3-diphenyl-; Photochromic Dye N1 (common trade designation); 3,3-Diphenyl-3H-benzo[f]chromene; Light-responsive naphthopyran derivative
EINECS	Contact for details

Quality Control

Our 3,3-Diphenyl-3H-naphtho[2,1-b]pyran is produced under a strict quality management system to ensure batch-to-batch consistency and high performance in photochromic applications. All materials undergo rigorous analytical testing, including HPLC for purity and spectral analysis for identity confirmation. Certificates of Analysis (COA) detailing purity, photochromic performance parameters, and impurity profiles are available upon request.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated place at room temperature (15-25°C). This compound is light-sensitive (store away from light) and should be handled under conditions that minimize exposure to strong light to preserve its photochromic properties.

Specification

Item	Specification
Appearance	Yellow to light brown crystalline powder
Identification (IR)	Conforms to structure
Purity (HPLC)	≥ 98.0%
Melting Point	Contact for details
Loss on Drying	≤ 0.5%
Photochromic Performance (δOD)	Contact for details
Heavy Metals	< 20 ppm

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.