1260-17-9
Product Name:
Carminic Acid
Formula:
C22H20O13
Synonyms:
Carminic acid (C.I. 75470);Natural Red 4
Inquiry
CHEMICAL AND PHYSICAL PROPERTIES
| Physical Description | Carminic acid appears as dark purplish-brown mass or bright red or dark red powder. Darkens at 248 °F. Deep red color in water. Yellow to violet in acidic aqueous solutions. (NTP, 1992) |
|---|---|
| Color/Form | Red monoclinic prisms from aqueous methanol |
| Melting Point | Decomposes at 277 °F (NTP, 1992) |
| Solubility | less than 1 mg/mL at 70 °F (NTP, 1992) |
| Optical Rotation | Specific optical rotation (water): +51.6 deg at 15 °C/654 angstroms |
| pH | pH = 4.8 (yellow); pH = 6.2 (violet) |
| Dissociation Constants | pKa1 = 2.81; pKa2 = 5.43; pKa3 = 8.10 |
| Other Experimental Properties | Bright-red, light pieces, easily reduced to powder; practically insoluble in cold water or dil acid; partly soluble in hot water; soluble in borax, alkali hydroxides and alkali carbonates giving deep red solutions /Aluminum calcium lake/ |
| Chemical Classes | Dyes -> Anthraquinone Dyes |
COMPUTED DESCRIPTORS
| Molecular Weight | 492.4 g/mol |
|---|---|
| XLogP3 | 0.5 |
| Hydrogen Bond Donor Count | 9 |
| Hydrogen Bond Acceptor Count | 13 |
| Rotatable Bond Count | 3 |
| Exact Mass | 492.09039069 g/mol |
| Monoisotopic Mass | 492.09039069 g/mol |
| Topological Polar Surface Area | 243 Ų |
| Heavy Atom Count | 35 |
| Formal Charge | 0 |
| Complexity | 864 |
| Isotope Atom Count | 0 |
| Defined Atom Stereocenter Count | 5 |
| Undefined Atom Stereocenter Count | 0 |
| Defined Bond Stereocenter Count | 0 |
| Undefined Bond Stereocenter Count | 0 |
| Covalently-Bonded Unit Count | 1 |
| Compound Is Canonicalized | Yes |
PRODUCT INTRODUCTION
description
Carminic acid appears as dark purplish-brown mass or bright red or dark red powder. Darkens at 248 °F. Deep red color in water. Yellow to violet in acidic aqueous solutions. (NTP, 1992)