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) |
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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 |
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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)