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The magnetic susceptibilities of a series of iridium complexes have been measured over a temperature range from 78°K to room temperature. K2IrCl6, (NH4)2IrCl6, (NH4)2IrBr6, and (CH3NH3)2IrCl6 follow the Curie-Weiss relationship approximately. The susceptibilities of (C5H6N)2IrCl6 and (Φ4As)2IrCl6 do not yield straight line 1/χM versus T°K plots. Ir(C5H5N)2Cl4 was found to be diamagnetic.
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Norman et al. (1959) studied this question.
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