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Gamma acid

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Identification
Molecular formula
C10H9NO4S
CAS number
90-51-7
IUPAC name
7-amino-4-hydroxy-naphthalene-2-sulfonic acid
State
State

At room temperature, gamma acid is typically in a solid state. It exists as a crystalline powder, often used in its hydrate form due to its sulfonic acid group introducing hygroscopic properties, causing it to attract moisture from the environment.

Melting point (Celsius)
300.00
Melting point (Kelvin)
573.00
Boiling point (Celsius)
545.00
Boiling point (Kelvin)
818.00
General information
Molecular weight
239.26g/mol
Molar mass
239.2560g/mol
Density
1.6800g/cm3
Appearence

Gamma acid usually appears as a pale yellow solid powder. It is an aromatic compound, associated with a slight sulfurous odor. This compound is soluble in hot water and slightly soluble in cold water, revealing its ionic nature, often derived from its sulfonic acid group. Its crystalline form may also present a more beige or creamy hue depending on the purity and particle size distribution of the sample.

Comment on solubility

Solubility of 7-amino-4-hydroxy-naphthalene-2-sulfonic acid

7-amino-4-hydroxy-naphthalene-2-sulfonic acid, often abbreviated as AHN, exhibits noteworthy solubility characteristics that are influenced by its unique molecular structure. This compound is considered to be:

  • Water Soluble: Due to the presence of both amino and sulfonic acid functional groups, AHN is highly soluble in water. This hydrophilicity allows it to interact favorably with water molecules, enhancing its solubility.
  • Poor Solubility in Organic Solvents: AHN's solubility diminishes dramatically in organic solvents such as ethanol or acetone. This is primarily because the hydrogen bonding capabilities and polar nature of AHN do not align well with the nonpolar characteristics of many organic solvents.
  • pH Dependency: The solubility of this compound is also pH-dependent. In acidic solutions, the solubility may decrease, while in basic solutions, the ionization of the amino and sulfonic acid groups could increase solubility further.

In summary, the solubility of 7-amino-4-hydroxy-naphthalene-2-sulfonic acid demonstrates a fascinating interplay of functional groups and environmental factors. As such, it is widely used in applications requiring aqueous conditions, where its properties can be maximized. As the well-known adage goes, "like dissolves like," and AHN exemplifies this principle by showing robust solubility in water but not in organic solvents.

Interesting facts

Interesting Facts About 7-Amino-4-Hydroxy-Naphthalene-2-Sulfonic Acid

7-Amino-4-hydroxy-naphthalene-2-sulfonic acid, often abbreviated as 7-AHNSA, is a fascinating compound with numerous applications in various fields, particularly in biochemistry and dye chemistry. Here are some key points to highlight its importance:

  • Biological Relevance: This compound serves as an essential intermediate in the synthesis of various dyes and pigments, showcasing its versatility in the textile and printing industries.
  • pH Indicator: 7-AHNSA can act as a pH indicator, making it useful in analytical chemistry for determining the acidity or basicity of solutions.
  • Pharmaceutical Applications: Due to its amino and hydroxyl groups, it exhibits potential as an active pharmaceutical ingredient (API) in developing therapeutic agents.
  • The Structure: The naphthalene ring system in this compound contributes to its stability and unique properties that allow it to interact effectively with various biological molecules.
  • Historical Significance: Several derivatives of naphthalene sulfonic acids have historical significance in dye production, marking the evolution of synthetic dyes in the 19th century.

As a chemist delving into the world of organic compounds, one cannot overlook the potential that 7-AHNSA holds in advancing our understanding of biochemical processes and its practical applications in various industries. Emphasizing the role of such compounds can inspire future research and innovations.

Synonyms
87-02-5
7-AMINO-4-HYDROXY-2-NAPHTHALENESULFONIC ACID
7-amino-4-hydroxynaphthalene-2-sulfonic acid
J acid
Isogamma acid
I acid
2-Amino-5-naphthol-7-sulfonic Acid
2-Naphthalenesulfonic acid, 7-amino-4-hydroxy-
Kyselina I
6-Amino-1-naphthol-3-sulfonic acid
Kyselina I [Czech]
Aminonaphthol sulfonic acid J
CCRIS 8989
EINECS 201-718-9
NSC 31510
7-Amino-4-hydroxynaphthalene-2-sulphonic acid
Kyselina 2-amino-5-naftol-7-sulfonova
BRN 2217192
9A1IU1C93L
CHEBI:87316
1-Hydroxy-6-amino-3-naphthalenesulfonic acid
NSC-7556
NSC-8631
Kyselina 2-amino-5-naftol-7-sulfonova [Czech]
Kyselina 6-amino-1-naftol-3-sulfonova [Czech]
NSC-31510
Kyselina 6-amino-1-naftol-3-sulfonova
3-amino-6-sulfo-8-naphthol
6-amino-3-sulfo-1-naphthol
MLS002638012
CHEMBL220259
DTXSID7026520
EC 201-718-9
3-amino-8-naphthol-6-sulfonic acid
1-HYDROXY-3-SULFO-6-AMINONAPHTHALENE
3-AMINO-8-HYDROXY-6-SULFONAPHTHALENE
6-AMINO-1-HYDROXY-3-SULFONAPHTHALENE
1-NAPHTHOL-3-SULFONIC ACID, 6-AMINO-
7-amino-4-hydroxy-naphthalene-2-sulfonic acid
2-AMINO-5-HYDROXY-7-NAPHTHALENESULFONIC ACID
3-AMINO-8-HYDROXY-6-NAPHTHALENESULFONIC ACID
6-AMINO-1-HYDROXY-3-NAPHTHALENESULFONIC ACID
DTXCID206520
WLN: L66J BQ DSWQ HZ
CAS-87-02-5
J-Saure
7-NH2-4-OH-2-NSA
7-amino-4-hydroxy-2-naphthalenesulfonate
cid_6868
UNII-9A1IU1C93L
SCHEMBL154124
NSC7556
NSC8631
HMS3085K07
NSC31510
Tox21_202232
Tox21_303310
BDBM50206424
AKOS015854951
NCGC00249193-01
NCGC00257232-01
NCGC00259781-01
AS-17223
PD183075
SMR001547516
7-amino-4-hydroxynaphthalene-2-sulfonicacid
DB-056966
A0370
CS-0187248
NS00007596
1-hydroxy-6-aminonaphthalene-3-sulphonic acid
2-amino-5-hydroxynaphthalene-7-sulfonic acid
7-amino-4-hydroxy-2-naphthalenesulphonic acid
H11790
Q259271
7-Amino-4-hydroxy-2-naphthalenesulfonic acid, technical, >=90% (T)
201-718-9