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The dihydrate NiCl 2 ·2H 2 O adopts a structure intermediate between the hexahydrate and the anhydrous forms. It consists of infinite chains of NiCl 2, wherein both chloride centers are bridging ligands. The trans sites on the octahedral centers occupied by aquo ligands. [10] A tetrahydrate NiCl 2 ·4H 2 O is also known.
Nickel(II) fluoride NiF 2 is yellow, crystallising in the rutile structure and can form a trihydrate, NiF 2 ·3H 2 O. [3] A tetrahydrate also exists. [4] Nickel chloride NiCl 2 is yellow, crystallising in the cadmium chloride structure. It can form a hexahydrate, NiCl 2 ·6H 2 O, a tetrahydrate NiCl 2 ·4H 2 O over 29 °C and a dihydrate, NiCl ...
The compound can be prepared by treating nickel or nickel(II) carbonate with acetic acid: . NiCO 3 + 2 CH 3 CO 2 H + 3 H 2 O → Ni(CH 3 CO 2) 2 ·4 H 2 O + CO 2. The mint-green tetrahydrate has been shown by X-ray crystallography to adopt an octahedral structure, the central nickel centre being coordinated by four water molecules and two acetate ligands. [5]
Nickel(II) perchlorate is a collection of inorganic compounds with the chemical formula of Ni(ClO 4) 2 (H 2 O) x.Its colors of these solids vary with the degree of hydration. For example, the hydrate forms cyan crystals, the pentahydrate forms green crystals, but the hexahydrate (Ni(ClO 4) 2 ·6H 2 O) forms blue crystals.
Because the Ni 2+ ion resembles many other divalent metal ions, it can be substituted by them, or substitute for them in other oxalate compounds to form mixed oxalates where the proportions can vary continuously. For example, magnesium nickel oxalate dihydrate.
NiCl 2 •6H 2 O + 2 PPh 3 → NiCl 2 (PPh 3) 2 + 6 H 2 O. When allowed to crystallise from chlorinated solvents, the tetrahedral isomer converts to the square planar isomer. The square planar form is red and diamagnetic. The phosphine ligands are trans with respective Ni-P and Ni-Cl distances of 2.24 and 2.17 Å.
Dichloro[1,2-bis(diphenylphosphino)ethane]nickel is a coordination complex with the formula NiCl 2 (dppe); where dppe is the diphosphine 1,2-bis(diphenylphosphino)ethane. It is used as a reagent and as a catalyst. [1] The compound is a bright orange-red diamagnetic solid. The complex adopts a square planar geometry. [2] [3]
Nickel nitrate is the inorganic compound Ni(NO 3) 2 or any hydrate thereof. In the hexahydrate, the nitrate anions are not bonded to nickel. Other hydrates have also been reported: Ni(NO 3) 2. 9H 2 O, Ni(NO 3) 2. 4H 2 O, and Ni(NO 3) 2. 2H 2 O. [3] It is prepared by the reaction of nickel oxide with nitric acid: NiO + 2 HNO 3 + 5 H 2 O → Ni ...