7789-49-3 Usage
Chemical Properties
Different sources of media describe the Chemical Properties of 7789-49-3 differently. You can refer to the following data:
1. (1) Brownish-yellow solid or yellow,
lustrous scales.(2) Deliquescent, greenish scales; loses 3H2O at 300C. Soluble
in water, alcohol, ether, and ammonium hydroxide.
2. The green hexahydrate NiBr2-6H2O readily evolves water; crystallization from aqueous
solutions above 29° yields the trihydrate NiBr2-3H2O. The hexahydrate can be dehydrated
to a dihydrate over concentrated sulphuric acid at 5°. The environment of the nickel atoms in NiBr2-6H20 is 2Br and 4H20 and in NiBr2-2H20 4Br and 2H20 ; in both cases the Ni-Br distance is 2.6 and the Ni-O distance 2.0 ?.
Uses
It is used in Soporific and sedatives pharmaceutical Industry, Photosensitive industry, Analytical Chemistry, and also electrolyte in high energy battery.
Preparation
Anhydrous NiBr2 is most conveniently prepared by the action of
bromine on nickel, either at red heat or in ethereal solution at room temperature74 or by
dehydration of the hexahydrate at about 140°. It crystallizes with the CdCl2 type structure, the nickel atoms being surrounded octahedrally by bromine atoms at 2.57 ?.
Check Digit Verification of cas no
The CAS Registry Mumber 7789-49-3 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 7,7,8 and 9 respectively; the second part has 2 digits, 4 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 7789-49:
(6*7)+(5*7)+(4*8)+(3*9)+(2*4)+(1*9)=153
153 % 10 = 3
So 7789-49-3 is a valid CAS Registry Number.
