Do you know the properties and structure of nickel chloride

Nickel chlorideAlso known as 2-nickel chloride, it is a compound with the chemical formula NiCl2. Anhydrous 2-nickel chloride is yellow, but it is rare in nature and can only be found in ores such as water nickelite, and is more commonly known by people. Familiar is the green 2-nickel chloride 6 hydrate (NiCl2 6H2O). 2-nickel chloride also has a series of known hydrates, all of which are green. Generally speaking, 2-nickel chloride is the most important and important in chemical synthesis. The source of nickel. Nickel salts are carcinogenic.

Physical and chemical properties Green or grass green monoclinic prismatic crystal. Relative density 1.921 g\/cm3. Bulk density: about 1.00 g\/cm3 (uncompacted). Melting point 80 degrees Celsius. Dehydration at 103oC. Decomposition at 973 oC. Solubility: 2135 g\/L (20oC); 5878 g\/L (80oC). 5% aqueous solution pH=3.5. Maximum insoluble content: 50 parts per million (nickel (Ni) % maximum mass: 24.00; cobalt (Co) Percentage of maximum mass: 0.5; copper (Cu): 2 parts per million; heavy metal (Pb): 2 parts per million; iron (Zn): 1 part per million). Tariff rate of nickel chloride: 28.27 soluble In water and ethanol, its aqueous solution is slightly acidic. It is easy to weather in dry air and deliquescence in humid air. When heated to above 140 degrees Celsius, it completely loses crystal water and turns into yellow-brown powder.

Nickel chlorideProperties and structure: NiCl2 adopts a CdCl2 type structure. In this structure, each Ni2 is coordinated with 6 Cl−, and each Cl− is coordinated with 3 Ni2. In NiCl2, Ni-Cl The bond has the characteristics of ionic bond. The yellow NiBr2 and the black NiI2 also adopt similar structures, but due to the different filling methods of the halogen atoms, these two nickel halides adopt the CdI2 type structure.

In contrast, NiCl2·6H2O contains trans-NiCl2(H2O)4 units and water molecules. NiCl2(H2O)4 connects with adjacent water molecules by weak force. It should be noted that the six water molecules in the molecular formula Only 4 of them are complexed with nickel, and the other 2 remaining water molecules become crystal water. Cobalt(II) chloride 6 hydrate also has a similar structure.

Many nickel(II) compounds are paramagnetic due to the presence of 2 unpaired electrons on each metal atom; however, when nickel forms 4-coordination complex ions with a planar square configuration, these complexes Matter is diamagnetic.