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3-Amino-5-mercapto-1,2,4-triazole

3-Amino-5-mercapto-1,2,4-triazole Structure
3-Amino-5-mercapto-1,2,4-triazole structure
CAS No.
16691-43-3
Chemical Name:
3-Amino-5-mercapto-1,2,4-triazole
Synonyms
3-AMINO-1,2,4-TRIAZOLE-5-THIOL;3-Amino-1H-1,2,4-triazole-5-thiol;iminothiourazole;5-AMINO-1H-1,2,4-TRIAZOLE-3-THIOL;3-Imino-5-thiourazole;5-AMINO-4H-1,2,4-TRIAZOLE-3-THIOL;4-triazolidine-3-thione,5-imino-2;3-ATM;ent61388;3-Amino-5-mercapto-1
CBNumber:
CB7178414
Molecular Formula:
C2H4N4S
Molecular Weight:
116.14
MDL Number:
MFCD00005231
MOL File:
16691-43-3.mol
MSDS File:
SDS
TDS File:
TDS
Last updated:2026-05-28 04:31:05
Product description Number Pack Size Price
3-Amino-1,2,4-triazole-5-thiol 95% 140260 10g $94.2
3-Amino-5-mercapto-1,2,4-triazole >98.0%(T) A1455 5g $20
3-Amino-5-mercapto-1,2,4-triazole >98.0%(T) A1455 25g $48
3-Amino-1,2,4-triazole-5-thiol 98+% (HPLC) ≥98%(HPLC) 231527 5g $156
3-Amino-1,2,4-triazole-5-thiol 98+% (HPLC) ≥98%(HPLC) 231527 100g $247
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3-Amino-5-mercapto-1,2,4-triazole Properties

Melting point >300 °C(lit.)
Boiling point 201.2±23.0 °C(Predicted)
Density 1.420 (estimate)
refractive index 1.5605 (estimate)
storage temp. Keep in dark place,Inert atmosphere,Room temperature
solubility water: soluble25mg/mL, clear, faintly yellow to yellow
pka 12.57±0.20(Predicted)
form Crystalline Powder
color White to light beige
Water Solubility SOLUBLE IN HOT WATER
BRN 112404
InChI InChI=1S/C2H4N4S/c3-1-4-2(7)6-5-1/h(H4,3,4,5,6,7)
InChIKey WZUUZPAYWFIBDF-UHFFFAOYSA-N
SMILES N1C(N)=NC(=S)N1
LogP 0.347 (est)
CAS DataBase Reference 16691-43-3(CAS DataBase Reference)
FDA UNII 353F2D8L1Z
EPA Substance Registry System 3H-1,2,4-Triazole-3-thione, 5-amino-1,2-dihydro- (16691-43-3)
UNSPSC Code 12352100

SAFETY

Risk and Safety Statements

Symbol(GHS)  Exclamation Mark (GHS07)
GHS07
Signal word  Warning
Hazard statements  H302+H312+H332-H315-H319-H335
Precautionary statements  P261-P264-P270-P271-P280-P301+P312+P330-P302+P352+P312+P362+P364-P304+P340+P312-P305+P351+P338+P337+P313-P501-P280g-P305+P351+P338
PPE dust mask type N95 (US), Eyeshields, Gloves
Hazard Codes  Xi,Xn,F
Risk Statements  36/37/38-22-11-20/21/22
Safety Statements  26-36-36/37/39-16
WGK Germany  3
RTECS  XZ5357500
F  13
TSCA  TSCA listed
HS Code  29339990
Storage Class 11 - Combustible Solids
REACH Registrations Active
NFPA 704
1
2 0

3-Amino-5-mercapto-1,2,4-triazole price More Price(58)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich 140260 3-Amino-1,2,4-triazole-5-thiol 95% 16691-43-3 10g $94.2 2023-01-07 Buy
TCI Chemical A1455 3-Amino-5-mercapto-1,2,4-triazole >98.0%(T) 16691-43-3 5g $20 2026-04-30 Buy
TCI Chemical A1455 3-Amino-5-mercapto-1,2,4-triazole >98.0%(T) 16691-43-3 25g $48 2026-04-30 Buy
Usbiological 231527 3-Amino-1,2,4-triazole-5-thiol 98+% (HPLC) ≥98%(HPLC) 5g $156 2026-06-03 Buy
Usbiological 231527 3-Amino-1,2,4-triazole-5-thiol 98+% (HPLC) ≥98%(HPLC) 100g $247 2026-06-03 Buy
Product number Packaging Price Buy
140260 10g $94.2 Buy
A1455 5g $20 Buy
A1455 25g $48 Buy
231527 5g $156 Buy
231527 100g $247 Buy

3-Amino-5-mercapto-1,2,4-triazole Chemical Properties,Uses,Production

Uses

3-Amino-5-mercapto-1,2,4-triazole is used as a corrosion inhibitor. It can also be used as a reactant in the synthesis of triazole derivatives.

Chemical Properties

white to light beige crystalline powder

Uses

3-Amino-1,2,4-triazole-5-thiol was used to study the inhibition of corrosion of iron in 3.5% NaCl solutions by low concentrations of ATT and 1,1′-thiocarbonyldiimidazole. It was used to prepare surface-enhanced Raman scattering based pH nano- and microsensor using silver nanoparticles.

Uses

3-Amino-5-mercapto-1,2,4-triazole is used as a corrosion inhibitor. It can also be used as a reactant in the synthesis of triazole derivatives.

Synthesis Reference(s)

Journal of Heterocyclic Chemistry, 26, p. 355, 1989 DOI: 10.1002/jhet.5570260216

General Description

3-Amino-1,2,4-triazole-5-thiol inhibits corrosion of copper in aerated acidic chloride pickling solutions.

Purification Methods

Recrystallise the triazole from H2O and dry it in vacuo. The acetyl derivative has m 325o(dec) after recrystallisation from H2O. [Beilstein 26 III/IV 1351.] It has also been recrystallised from EtOH/H2O (3:1, 1g in 50 mL, 50% recovery), m 300-302o (dec subject to heating rate), ( max 263nm, log 4.12). The S-benzyl derivative, when crystallised from *C6H6/EtOH (20:1), or CHCl3/Et2O has m 109-111o [Godfrey & Kruzer J Chem Soc 3437 1960, Beilstein 26 III/IV 1351.]

Toxics Screening Level

The initial threshold screening level (ITSL) for 3-amino-5-mercapto-1 ,2,4-triazole is 7μg/m3 based on an annual averaging time.

3-Amino-5-mercapto-1,2,4-triazole synthesis

142-46-1
16691-43-3
Synthesis of 3-Amino-5-mercapto-1,2,4-triazole from Hydrazodicarbothioamide

3-Amino-5-mercapto-1,2,4-triazole Preparation Products And Raw materials

Raw materials

Hydrazodicarbothioamide

Preparation Products

Diniconazole CAFENSTROLE Nefazodone Tazobactam acid Letrozole
3-[(4-methylphenyl)methylsulfanyl]-1H-1,2,4-triazol-5-amine

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3-Amino-5-mercapto-1,2,4-triazole Suppliers

Global( 458)Suppliers
Supplier Tel Email Country ProdList Advantage
Shaoxing Fangxiao Chemical Co., LTD
+86-13456999252 +86-13868192239 kenny@fangxiaochem.com China 50 58
Zhejiang Kinso Technology Co., LTD.
+86-571-56950601; +8619857958369 sales@kinsopharma.com China 51 58
Hebei Chuanghai Biotechnology Co,.LTD 		+86-86-13131129325 +8613131129325 sales1@chuanghaibio.com China 5225 58
Hebei Chuanghai Biotechnology Co., Ltd 		+8615531151365 mina@chuanghaibio.com China 18126 58
Hebei Zhuanglai Chemical Trading Co Ltd 		+86-16264648883 niki@zlchemi.com China 7245 58
Shanghai Daken Advanced Materials Co.,Ltd 		+86-2158073036 info@dakenam.com China 14014 58
Henan Tianfu Chemical Co.,Ltd. 		+86-0371-55170693 +86-19937530512 info@tianfuchem.com China 21586 55
ATK CHEMICAL COMPANY LIMITED 		+undefined-21-51877795 ivan@atkchemical.com China 33024 60
career henan chemical co 		+86-0371-86658258 +8613203830695 sales@coreychem.com China 29812 58
Jinan Finer Chemical Co., Ltd 		+86-531-88989536 +86-15508631887 sales@finerchem.com China 2950 58
Supplier Advantage
Shaoxing Fangxiao Chemical Co., LTD
58
Zhejiang Kinso Technology Co., LTD.
58
Hebei Chuanghai Biotechnology Co,.LTD 		58
Hebei Chuanghai Biotechnology Co., Ltd 		58
Hebei Zhuanglai Chemical Trading Co Ltd 		58
Shanghai Daken Advanced Materials Co.,Ltd 		58
Henan Tianfu Chemical Co.,Ltd. 		55
ATK CHEMICAL COMPANY LIMITED 		60
career henan chemical co 		58
Jinan Finer Chemical Co., Ltd 		58

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3-Amino-5-mercapto-1,2,4-triazole pictures 2026-06-23 3-Amino-5-mercapto-1,2,4-triazole
16691-43-3
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16691-43-3
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16691-43-3
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3-Amino-5-mercapto-1,2,4-triazole Spectrum

3-Amino-5-mercapto-1,2,4-triazole(16691-43-3)MS3-Amino-5-mercapto-1,2,4-triazole(16691-43-3)1HNMR3-Amino-5-mercapto-1,2,4-triazole(16691-43-3)13CNMR3-Amino-5-mercapto-1,2,4-triazole(16691-43-3)IR13-Amino-5-mercapto-1,2,4-triazole(16691-43-3)IR23-Amino-5-mercapto-1,2,4-triazole(16691-43-3)Raman

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3-AMINO-5-MERCAPTO-1,2,4-TRIAZOLE 3-AMINO-5-MERCAPTO-1H-1,2,4-TRIAZOLE 3-AMINO-4H-1,2,4-TRIAZOLE-5-THIOL 5-MERCAPTO-3-AMINO, 1,2,4-TRIAZOLE 3H-1,2,4-Triazole-3-thione, 5-amino-1,2-dihydro- 3H-1,2,4-Triazole-3-thione,5-amino-1,2-dihydro-(9CI) 5-AMINO-4H-1,2,4-TRIAZOLE-3-THIOL LABOTEST-BB LT00007791 3-Amino-5-mercapto-1,2,4-triazole,tech. 3-Amino-5-mercapto-1,2,4-triazole, 98+% 5-Amino-1,2-dihydro-1,2,4-triazole-3-thione 3-Amino-1H-1,2,4-triazole-5-thiol 1,2-dihydro-5-amino-3h-1,2,4-triazole-3-thione 2,4-Triazolidine-3-thione,5-imino-1 4-triazole-3-thione,1,2-dihydro-5-amino-3h-2 4-triazole-3-thione,5-amino-1,2-dihydro-3h-2 5-amino-s-triazole-3-thio 5-imino-2-triazolidine-3-thione ent61388 5-Amino-1H-1,2,4-triazole-3(2H)-thione 5-Amino-2H-1,2,4-triazole-3-thiol 3-Amino-5-mercapto-1,2,4-triazole,99% 3-Amino-5-mercapto-1 5-Amino-4H-1,2,4-triazole-3-thiol , Tech. 3-AMINO-5-MERCAPTO-1,2,4-TRIAZOLE FOR SY 3-ATM 3--5--1,2,4- threeaMinoMercaptotriazole 3- aMino-5- Mercaptotriazole-1,2,4-three 5-aMino-3H-1,2,4-triazole-3-thione 3-AMino-1,2,4-triazole-5-thiol 95% 4-triazolidine-3-thione 5-imino-1 4-Triazole-3-thione 5-amino-1,2-dihydro-3h-2 4-Triazolidine-3-thione 3-Amino-1,2,4-triazole-5-thiol≥ 98% (HPLC) 3-Amino-5-mercapto-1,2,4-triazole for synthesis 3-Amino-5-mercapto-1,2,4-triazole > 3-Amino-5-Mercapto-1, 2, 4-Triazolee Supply 3-Amino-5-Mercapto-1, 2, 4-Triazole CAS: 16691-43-3, 99% Assay TIANFUCHEM--16691-43-3--3-Amino-5-mercapto-1,2,4-triazole factory price 3-Amino-5-methio-1,2,4-triazole 3-Amino-5-mercapto-1,2,4-triazole (AMT) 3-AMINO-1,2,4-TRIAZOLE-5-THIOL 3-Imino-5-thiourazole 4-triazolidine-3-thione,5-imino-2 5-AMINO-1H-1,2,4-TRIAZOLE-3-THIOL iminothiourazole 16691-43-3 16691-43-4 AMINE Heterocyclic Building Blocks Triazoles Building Blocks Organic chemical 3-AMINO-5-MERCAPTO-1,2,4-TRIAZOLE Heterocyclic Compounds THIOL bc0001 16691-43-3