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Mercury(II) iodide

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Identification
Molecular formula
HgI2
CAS number
7774-29-0
IUPAC name
iodomercury
State
State

At room temperature, mercury(II) iodide is in a solid state. It is highly sensitive to temperature changes, showing a polymorphic transition upon heating, which makes it a substance of interest for thermo-optical studies.

Melting point (Celsius)
259.00
Melting point (Kelvin)
532.15
Boiling point (Celsius)
350.00
Boiling point (Kelvin)
623.15
General information
Molecular weight
454.44g/mol
Molar mass
454.4430g/mol
Density
6.3600g/cm3
Appearence

Mercury(II) iodide appears as a bright red-orange solid at room temperature. It is insoluble in water but dissolves in potassium iodide solution. Mercury(II) iodide is known for its dramatic color change when heated above 126 °C, where it turns to a pale yellow form.

Comment on solubility

Solubility of Iodomercury

Iodomercury, also known as mercuric iodide, presents intriguing characteristics in terms of solubility. The general formula for iodomercury is HgI2. Understanding its solubility behavior can be quite revealing:

  • Solubility in Water: Iodomercury is known to be sparingly soluble in water. This limited solubility can be attributed to its ionic nature and the strong interaction between mercury and iodine atoms.
  • Solubility in Organic Solvents: Unlike its behavior in aqueous solutions, iodomercury demonstrates higher solubility in various organic solvents, including alcohols and ethers, which can contribute to its applications in organic synthesis.
  • Temperature Dependence: The solubility of iodomercury in water may vary with temperature. Speaking generally, increased temperatures can lead to a slight increase in solubility.

Moreover, understanding the solubility of iodomercury is crucial for chemical reactions involving this compound. As noted in many sources, *“The reactivity and applications of iodomercury are heavily influenced by its solubility characteristics.”* These properties make it essential in various fields, including pharmaceuticals and analytical chemistry.

In summary, while iodomercury demonstrates limited aqueous solubility, its considerable solubility in organic solvents highlights its versatility in chemical applications. The distinct solubility profile invites further exploration into its practical uses and implications in different environments.

Interesting facts

Interesting Facts About Iodomercury

Iodomercury, which is often referred to in scientific contexts as mercuric iodide, is a fascinating compound that has played a significant role in chemistry and medicine throughout history. Its unique properties and applications make it worthy of attention.

Historical Significance

This compound has been known since ancient times and was used in traditional medicine for its antiseptic properties. Here are some notable points:

  • Renaissance Medicine: Iodomercury was utilized in various medicinal preparations as a cure for ailments, even leading to its adoption in early pharmacology.
  • Scientific Research: Chemists in the 19th century studied its properties extensively, paving the way for further innovations in organic and inorganic chemistry.

Chemical Properties

Iodomercury is classified as a mercurial compound, and its structure includes the toxic element mercury combined with iodine. Some interesting points include:

  • Reactivity: It is known for its reactivity with other compounds, leading to some fascinating reactions in organic synthesis.
  • Polymorphism: This compound can exist in different forms, each demonstrating distinct physical properties and potential applications.

Current Applications

Although its use has decreased due to safety concerns regarding mercury, iodomercury still has some modern applications:

  • Photography: It has historically been used in photography, particularly in early processes involving the development of photographic plates.
  • Organic Synthesis: Iodomercury continues to be of interest in the synthesis of complex organic molecules.

It’s essential to approach the study and handling of iodomercury with care due to its toxicity. As chemists and students, understanding both the historical context and the molecular intricacies of such compounds allows for a deeper appreciation of the field of chemistry. As the saying goes, "In science, nothing is ever truly waste; it's all simply a matter of perspective."

Synonyms
7783-30-4
Mercury iodide (HgI)
MERCURY(I) IODIDE
Iodure de mercure [French]
Jodquecksilber
Iodure de mercure
EINECS 231-988-3
UN1638
MERCURY IODIDE, SOLID
DTXSID601027465
Mercury iodide; Dimercury diiodide
Mercury iodide, solid [UN1638] [Poison]