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The magnetic susceptibilities of V (bipy)3(ClO4)2, K3Cr(CN)6, and K2MnCl6 have been measured in the temperature range of liquid-nitrogen to room temperature. The magnetic moments of the ions, V2+, Cr3+, and Mn4+ agree, within experimental error, with the spin-only moment, 3.87 β.
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Norman Elliott (1967) studied this question.
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