Pentaamminehydridorhodium III Sulfate

Crystalline pentaamminehydridorhodium(III) sulfate is quite stable in air and can be stored indefinitely. In aqueous solution 

The proton magnetic resonance spectrum has a doublet centered at t 27.1 ( /Rh H, 14.5 Hz. the Rh—H stretching frequency, in the infrared spectrum (Nujol mull), is at 2079(s) cm.-1. The interaction of the complex with alkenes produces5 stable alkyl complexes of the type [Rh(NH3)5R]S04. In solution the complex reacts with molecular oxygen to give a blue peroxo complex displacement of ammonia by ethylenediamine can also be achieved.6 

Submitted by B. JACK McCORMICK, EDGAR N. JAYNES, JR., and ROY I. KAPLAN  

Five grams (0.0153 mole) potassium tetrachloropalladate(II) is dissolved in 40 ml. of warm water, and the resulting solution is divided into two equal portions. To one of the portions in a 125-ml. Erlenmeyer flask is added 10.5 ml. (0.0158 mole) of 1.50 M ethylenediamine. The ethylenediamine should be 

2K2PdCl4 + 2bipy — [Pd(bipy)2][PdCl4j + 4KC1 [Pd (bipy) 2] [PdCl4] A 2[Pd(bipy)Cl2] 

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