HAFNIUM CHLORIDE

 Hafnium chloride with cas register number of 37230-84-5 is also named as Hafnium tetrachloride ; Hafnium(IV) chloride ; HfCl4 ; 590592_ALDRICH ; 51302_FLUKA ; MolPort-003-928-717 ; CID37715 ; EINECS 236-826-5 ,and so on. Hafnium chloride (CAS No.37230-84-5) is colourless solid which is the precursor to most hafnium organometallic compounds.
IUPAC Name: Tetrachlorohafnium
CAS: 37230-84-5
Molecular Formula:  Cl₄Hf
Molecular Weight: 320.302
Molecular structure:
H bond acceptors:  0 
H bond donors:  0 
Freely Rotating Bonds:  0 
Enthalpy of Vaporization:  16.15 kJ/mol 
Vapour Pressure:  33900 mmHg at 25°C 
Topological Polar Surface Area: 0
Heavy Atom Count: 5
Formal Charge: 0
Complexity: 19.1
Isotope Atom Count 0
Defined Atom StereoCenter Count: 0
Undefined Atom StereoCenter Count: 0
Defined Bond StereoCenter Count: 0
Undefined Bond StereoCenter Count: 0
Covalently-Bonded Unit Count: 1

 Hafnium chloride (CAS No.37230-84-5) is commonly used as a Lewis acid and catalyst for certain alkylation and isomerism reactions. It also can be used in organic synthesis and materials science applications.

 Hafnium chloride (CAS No.37230-84-5) can be prepared by following steps:
(1) the reaction of carbon tetrachloride and hafnium oxide at above 450 °C;
(2) chlorination of a mixture of HfO2 and carbon above 600 °C;
(3) chlorination of hafnium carbide above 250 °C.

Poison by intraperitoneal route. Moderately toxic by ingestion. A skin irritant. When heated to decomposition it emits toxic fumes of Cl⁻. See also HAFNIUM and CHLORIDES.