Nickel Iodide (NiI2) forms from nickel and iodine. It exhibits yellow color, and is used in organic synthesis. Notable as a catalyst. Reactivity is influenced by ionic nature.
| IUPAC Name | Nickel(II) Iodide |
| Molecular Formula | NiI2 |
| CAS Number | 13462-90-3 |
| Synonyms | Nickelous Iodide, Nickel Diiodide, Dinitronickel, Nickel(II) diiodide |
| InChI | InChI=1S/2HI.Ni/h2*1H;/q;;+2/p-2 |
Nickel Iodide Properties
Nickel Iodide Formula
The chemical formula of nickel diiodide is NiI2. It consists of one nickel (Ni) atom and two iodine (I) atoms. The atoms are bonded together in a compound that is represented by this simple formula.
Nickel Iodide Molar Mass
The molar mass of nickel diiodide (NiI2) is approximately 312.5 grams per mole. This value is calculated by adding the atomic masses of one nickel atom and two iodine atoms present in the compound.
Nickel Iodide Boiling Point
Nickel diiodide has a boiling point of about 379 degrees Celsius (714 degrees Fahrenheit). This is the temperature at which the compound changes from a liquid state to a gaseous state under standard atmospheric pressure.
Nickel Iodide Melting Point
The melting point of nickel diiodide is around 647 degrees Celsius (1197 degrees Fahrenheit). This temperature indicates the transition of the compound from a solid state to a liquid state when heated.
Nickel Iodide Density g/mL
The density of nickel diiodide is about 4.95 grams per milliliter (g/mL). This value represents the mass of the compound per unit volume and gives insight into its compactness.
Nickel Iodide Molecular Weight
The molecular weight of nickel diiodide (NiI2) is approximately 312.5 grams per mole. This value is also the molar mass of the compound and is useful in various chemical calculations.
Nickel Iodide Structure
Nickel diiodide has a crystal lattice structure in its solid form. The arrangement of nickel and iodine atoms in the lattice contributes to the compound’s properties and behavior. This structure influences its physical and chemical characteristics.
Nickel Iodide Solubility
Nickel diiodide demonstrates limited solubility in water. It is more soluble in polar solvents due to its ionic nature. The solubility of nickel diiodide can vary with temperature and the nature of the solvent used.
| Appearance | Yellow crystals |
| Specific Gravity | 4.95 g/mL |
| Color | Yellow |
| Odor | Odorless |
| Molar Mass | 312.5 g/mol |
| Density | 4.95 g/mL |
| Melting Point | 647°C (1197°F) |
| Boiling Point | 379°C (714°F) |
| Flash Point | Not applicable |
| Water Solubility | Limited |
| Solubility | Soluble in polar solvents, vary with temperature |
| Vapour Pressure | Not well-defined |
| Vapour Density | Not well-defined |
| pKa | Not well-defined |
| pH | Neutral |
Nickel Iodide Safety and Hazards
Nickel diiodide poses certain safety concerns. It can irritate the skin and eyes upon contact. Inhalation of its dust or fumes might lead to respiratory irritation. Handling should be done with care, using appropriate protective measures like gloves and goggles. Avoid ingestion as it can cause gastrointestinal discomfort. Due to its potential for skin sensitization, prolonged exposure should be minimized. As with any chemical, proper ventilation in handling areas is crucial. In case of accidental exposure, rinse affected areas thoroughly and seek medical attention if needed. Understanding and following safety protocols are vital when working with nickel diiodide.
| Hazard Symbols | Health Hazard |
| Safety Description | Irritant |
| UN IDs | UN3077 |
| HS Code | 2827.60.00 |
| Hazard Class | 9 (Miscellaneous hazardous materials) |
| Packing Group | III |
| Toxicity | Harmful if ingested or inhaled. Can cause skin and eye irritation. Potential for skin sensitization. |
Nickel Iodide Synthesis Methods
Nickel diiodide can be synthesized through various methods. One common approach involves reacting nickel metal or nickel oxide with iodine vapor. This reaction takes place at elevated temperatures, resulting in the formation of nickel diiodide.
Another method employs the reaction between nickel chloride and potassium iodide. By mixing these compounds in a suitable solvent, such as water, nickel diiodide precipitates out.
Additionally, a solution of nickel sulfate and potassium iodide can undergo a displacement reaction, producing nickel diiodide and potassium sulfate.
Another method utilizes the reaction between nickel carbonate and hydroiodic acid. The resulting product is nickel diiodide along with the liberation of carbon dioxide gas.
These methods enable the production of nickel diiodide for various applications in chemistry, industry, and research. Careful control of reaction conditions is essential to achieve the desired purity and yield of nickel diiodide.
Nickel Iodide Uses
Nickel Iodide (NiI2) finds versatile applications across different fields due to its unique properties. Here are its key uses:
- Catalysis: Nickel diiodide serves as a catalyst in various chemical reactions, especially in organic synthesis. It facilitates reactions like carbon-carbon bond formation and reduction processes.
- Electroplating: Utilizing nickel diiodide in electroplating processes to deposit a thin nickel layer onto surfaces enhances corrosion resistance and appearance.
- Medicine: Researchers explore nickel diiodide for potential antimicrobial and antifungal properties in medicinal research, contributing to new pharmaceutical development.
- Photography: Its light-sensitive properties find application in certain photographic uses, particularly in the production of photosensitive materials.
- Laboratory Research: Scientists employ nickel diiodide in various experiments and studies, using it as a reactant in chemical reactions.
- Electronics: Nickel diiodide plays a role in producing electronic components like semiconductors, with its properties controlled during synthesis.
- Catalyst Regeneration: Industrial processes employ it for catalyst regeneration, effectively extending the catalyst’s lifespan and reducing waste.
- Chemical Intermediates: Serving as an intermediate, nickel diiodide aids in synthesizing organic compounds used in dye, pigment, and pharmaceutical production.
- Coordination Complexes: Researchers use nickel diiodide to create coordination complexes for studying molecular structures and interactions.
- Research and Education: Nickel diiodide’s properties make it a valuable teaching tool in educational settings, helping students understand chemical reactions and principles.
The diverse applications of nickel diiodide highlight its significance in research, industry, and technological advancements, contributing to various fields through its catalytic, electronic, and chemical properties.
Questions:
Q: What is the formula for nickel(II) iodide?
A: The formula is NiI2.
Q: Is nickel iodide soluble?
A: Yes, it is soluble in polar solvents.
Q: Is nickel(II) iodide soluble in water?
A: Yes, it is soluble in water.
Q: How to write the chemical formula for nickel(II) iodide?
A: The chemical formula is NiI2.
Q: How to write the formula nickel diiodide?
A: The formula is NiI2.
Q: What is the nomenclature of nickel and diiodide?
A: The nomenclature is “nickel” for Ni and “diiodide” for I2.
Q: Is nickel iodide a precipitate?
A: No, it is usually not a precipitate.
Q: Does silver nitrate and nickel(III) iodide form a precipitate?
A: No, they generally do not form a precipitate.
Q: What are the products of lead(II) nitrate and nickel(II) iodide?
A: The products are lead(II) diiodide and nickel(II) nitrate.
Q: An aqueous solution containing 1.0 M NiI2 and 1.0 M KBr is electrolyzed. What are the products?
A: The products are nickel metal, iodine gas, potassium metal, and bromine gas.
Q: What is the name of the compound with the formula NiI2?
A: The name is nickel(II) diiodide.
Q: 2. Aqueous solutions of 2.0 M NiI2 and 2.0 M KBr are mixed and electrolyzed. What are the products?
A: The products are nickel metal, iodine gas, potassium metal, and bromine gas.
Q: What is the mass percent of each element in NiI2?
A: Ni contributes about 44.3% and iodine about 55.7% to the mass percent of NiI2.