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The magnetic susceptibilities of five compounds of tervalent chromium and seven compounds of tervalent iron have been measured over the range of temperature 80--300°K. The compounds are formulated with a trimeric cation in which two carboxylate groups bridge each of the sides of the equilateral triangle, whose vertices are the metal atoms and whose centre is an oxygen atom. The exchange integrals of magnetic interaction derived from the measurements are compared with values known in other M-O-M systems. Measurements of the susceptibilities of some of the compounds in water show that the trimeric cation is maintained in solution.

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