Complex Hydrides

COMPLEX HYDRIDES
	INTRODUCTION
	Hydrides of group I-A and the group III-A are combined to form complex hydrides. Complex hydrides contains all three types of bonds.
	GENERAL FORMULA	www.citycollegiate.com
	MAH4 Where M= element of of I-A group. A= element of III-A group.
	EXAMPLES
	LiAlH4, NaAlH4, LiGaH4 etc
	PREPARATION
	LiH + AlH3 è LiAlH4 NaH + GaH3 è NaGaH4 LiH + GaH3 è LiGaH4
	IONIZATION	www.citycollegiate.com
	They ionize as M+ and AH4- LiAlH4 è Li+ + AlH4- NaAlH4 è Na+ + AlH4-
	PROPERTIES
	They are soluble in water. They are thermally stable upto 300C. They are solids. They are white in colour. They are reducing agent.
	REACTION WITH WATER	www.citycollegiate.com
	Complex hydrides when treated with water, two hydroxides are obtained with the liberation of hydrogen gas.
	NaAlH4 + 4H2O è NaOH + Al(OH)3 + 4H2