1 Properties: red cubic crystal. Moisture absorption. Decomposition when heated.
2 Solubility: soluble in water, alcohol, ether, acetone, pyridine. Insoluble in chloroform, toluene.
to form sulfur iron cyanide followed the "hybrid DSP" iron arrangement extranuclear formula: 1s 2 2s 2 2p 6 3s 2 3p 6 3d 6 4s 2 or [Ar] 3d 6 4s 2 . Since there are five tracks 3d level, so that the iron loss of three electrons, iron ions formed is formed in the half-filled d orbital. Ratio of ferrous ion thereby lose two electrons to form stable. (See rule Hund) passes through the reformer, there are two 3d orbitals, one 4s and three 4p orbital tracks hybridization, to form a "DSP hybrid orbital" (the track rail type). Thereby know the extending direction of the electron cloud is octahedron, which is expressed as complex ions: [Fe (SCN) 6 ] 3 - .
Computational Chemistry Data h2>
1, hydrophobic parameter for calculating the reference value (XlogP): no
2, the number of hydrogen bond donor: 0< p> 3, the number of hydrogen bond acceptor: 6
4, rotatably chemically number: 0
5, the number of mutual tautomers: no
6, topological molecular polar surface area: 74.4
7, the number of heavy atoms: 10
8, the surface charge: 0
9, complexity: 31.3 < / p>
10, the number of isotopic atoms: 0
11, determines the number of atoms stereocenter: 0
12, the number of uncertain atoms stereocenter: 0
13, to determine the chemical bond stereocenter number: 0
14, the number of uncertain chemical bond stereocenter: 0
15, the number of covalent bond units: 4 < / p>
method 3Ba (SCN) 2 + method Fe 2 (SO 4 ) 3 = 2Fe (SCN) 3 + 3BaSO 4 ↓ .
Equal amounts of Ba (SCN) 2 solution and Fe 2 (SO 4 ) < sub>3 mixed solution, place some time. Was removed by filtration BaSO 4 precipitate. The filtrate was placed on the ceramic desiccator until small crystals appear. From the solution was poured large crystals, and then evaporated. Repeated several times until a constant component of the crystal.
The main application
1, may be utilized in the analytical chemistry iron thiocyanate solution was red color to test Fe 3 + and the presence of color Determination of Fe 3 + .
on the method used to identify the iron sulfur ferricyanide: Take SCN - solution, and 3Mixed Fe +, i.e. there appeared blood red. The color is more pronounced in amyl alcohol or ether. However, it must be removed nitrite, otherwise it will generate before the experiment NOSCN, red color reaction, interference experiments, but the red disappear after heating. Sodium carbonate solution will interfere with the experiment, the iron hydroxide precipitate was generated, and color development time is not long, it will soon be reduced to a colorless sulfur ferrocyanide.
fluoride, mercury chloride can red bleach:
2 [FeSCN 2 + ] + HgCl 2 = 2 [Fe 3 + ] + 2Cl - + Hg (SCN) 2
Fe (SCN) 3 + 6F - = [FeF 6 ] 3 - + 3SCN -< p> PO4 3 - , Ac - , IO 3 - interference experiments. Fe (SCN) 3 color is actually mainly [FeSCN] 2 + color. [Fe (CN) 6 ] 3 - with Fe 2 + effect generated blue precipitate, this phenomenon can be used to verify Fe 3 + if it contains Fe 2 + .
2, the use of video works which were often characteristic of red blood, to mimic the blood, to achieve the desired imaging effect.