CHEMICAL AND PHYSICAL PROPERTIES
| Physical Description | Thiourea appears as white or off-white crystals or powder. Sinks and mixes with water. (USCG, 1999) |
|---|---|
| Color/Form | White solid which crystallizes in a rhombic bipyramidal structure |
| Odor | Odorless |
| Taste | Bitter |
| Boiling Point | Sublimes in vacuum at 302-320 °F (NTP, 1992) |
| Melting Point | 349 to 352 °F (NTP, 1992) |
| Solubility | >11.4 [ug/mL] (The mean of the results at pH 7.4) |
| Density | 1.405 at 68 °F (USCG, 1999) - Denser than water; will sink |
| Vapor Pressure | 0.0028 [mmHg] |
| LogP | log Kow = -1.08 |
| Decomposition | When heated to decomposition it emits very toxic fumes of nitroxides and sulfoxides. |
| Heat of Combustion | Heat of combustion at constant volume is -1482.2 kJ/mol (-19.47 kJ/g), and at constant pressure -1485.6 kJ/mol (-19.52 kJ/g) |
| Surface Tension | 1.0404X10-2 N/m at 454.15 K |
| Polymerization | Acrylaldehyde is very reactive & will polymerize rapidly, accelerating to violence, in contact with strong acid or basic catalysts. ... Exposure to weakly acidic conditions (nitrous fumes, sulfur dioxide, carbon dioxide), some hydrolysable salts, or thiourea will also cause exothermic & violent polymerization. |
| Dissociation Constants | pK-value not determinable according to OECD guideline no. 112 with the titration method at 24 °C (forms no OH or H ions) |
| Kovats Retention Index | 531.5 |
| Other Experimental Properties | Three functional groups - amino, imino, and thiol ... can react as the tautomeric iminothiol ... forms calthrates ... can be alkylated and acylated, and reacts with aldehydes and ketones. |
| Chemical Classes | Nitrogen Compounds -> Thiourea Compounds |
SAFETY INFORMATION
| Signal word | Warning |
|---|---|
| Pictogram(s) |
 Exclamation Mark Irritant GHS07  Health Hazard GHS08  Environment GHS09 |
| GHS Hazard Statements |
H302:Acute toxicity,oral H351:Carcinogenicity H411:Hazardous to the aquatic environment, long-term hazard |
| Precautionary Statement Codes |
P201:Obtain special instructions before use. P202:Do not handle until all safety precautions have been read and understood. P264:Wash hands thoroughly after handling. P264:Wash skin thouroughly after handling. P273:Avoid release to the environment. P301+P312:IF SWALLOWED: call a POISON CENTER or doctor/physician IF you feel unwell. P308+P313:IF exposed or concerned: Get medical advice/attention. |
COMPUTED DESCRIPTORS
| Molecular Weight | 76.12 g/mol |
|---|---|
| XLogP3 | -0.8 |
| Hydrogen Bond Donor Count | 2 |
| Hydrogen Bond Acceptor Count | 1 |
| Rotatable Bond Count | 0 |
| Exact Mass | 76.00951931 g/mol |
| Monoisotopic Mass | 76.00951931 g/mol |
| Topological Polar Surface Area | 84.1 Ų |
| Heavy Atom Count | 4 |
| Formal Charge | 0 |
| Complexity | 29 |
| Isotope Atom Count | 0 |
| Defined Atom Stereocenter Count | 0 |
| 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
Thiourea appears as white or off-white crystals or powder. Sinks and mixes with water. (USCG, 1999)