Description

2,5!-Dibenzo-21-Crown-7, 97 is a high-purity crown ether compound, a key member of the macrocyclic polyether family. This product is essential for its exceptional ability to selectively bind and transport specific metal cations, particularly potassium ions, due to its precisely sized 21-membered ring cavity. It is a critical reagent for researchers and manufacturers in advanced materials science, analytical chemistry, and catalysis who require reliable and consistent complexation properties. The compound is supplied at a minimum purity of 97% to ensure performance in sensitive applications.

Application

• Phase-Transfer Catalysis (PTC): Facilitates reactions between reagents in immiscible phases, enhancing reaction rates and yields in organic synthesis.
• Ion-Selective Electrodes (ISEs) & Sensors: Serves as a key ionophore in membrane formulations for the selective detection and measurement of potassium ions.
• Metal Ion Separation & Extraction: Used in liquid-liquid extraction processes to selectively separate and concentrate specific alkali metal cations from complex mixtures.
• Supramolecular Chemistry & Host-Guest Systems: Acts as a molecular host for constructing complex architectures, molecular machines, and functional materials.
• Polymer Modification: Incorporated into polymer matrices to create ion-conductive materials or to impart specific metal-binding properties.
• Analytical Chemistry: Employed as a masking agent or complexing agent in titrations, chromatography, and spectroscopic analysis to improve selectivity.
• Chemical Research & Development: A fundamental tool for studying cation-macrocycle interactions, solvation, and transport phenomena.

Basic Information

Product Name	2,5!-Dibenzo-21-Crown-7, 97
CAS No.	133560-78-8
Molecular Formula	C22H28O7
Molecular Weight	404.45 g/mol
Synonyms	2,5!-Dibenzo-21-crown-7; 21-Crown-7, 2,5!-dibenzo-; Dibenzo-21-crown-7; DB21C7; 4,7,13,16,21,24-Hexaoxa-1,10-diazabicyclo[8.8.8]hexacosane, 2,5!-dibenzo- derivative; 1,4,7,10,13,16,21-Heptaoxacyclotricos-2,5!-diene; Potassium ionophore I (Crown ether); 21-Membered crown ether dibenzo derivative
EINECS	Contact for details

Quality Control

Our 2,5!-Dibenzo-21-Crown-7, 97 is produced and tested under a rigorous quality management system. Each batch undergoes comprehensive analytical characterization to ensure identity, purity, and consistency. Certificates of Analysis (COA) detailing specifications such as assay (HPLC), appearance, and melting point are provided and available upon request. We support research and industrial applications requiring reliable and traceable material performance.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). This compound is light-sensitive (store away from light) and may be hygroscopic (moisture-sensitive). Keep away from strong oxidizing agents.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 97.0%
Melting Point	Contact for details
Loss on Drying	≤ 0.5%

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