Studies on the Linear Antiferromagnets : Magnetic Susceptibilities of Cupric Quinone Complex Salts at Low Temperatures

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The magnetic susceptibilities of three Cu quinone complex salts were measured at low temperatures. These salts, Cu–Q–H, Cu–Q–Cl and Cu–Q–Br, are considered to have structure of magnetic one dimensional lattice. Cu–Q–H is obtained in the form of stick-like colloid whose length is shorter than a few thousand Å. Some characteristics of the antiferromagnetic linear chain were found in Cu–Q–H. At the lowest temperatures, the end effect and the odd or even number effect were examined. The length of the chain of Cu–Q–H is estimated to have the number of Cu2+ ions more than 9. The super-exchange interaction in a chain of each salt passes through the intervening quinone-molecule. The coupling constant J between nearest neighboured Cu2+ ions in Cu–Q–H was estimated to be between k(−14°K) and k(−24°K). The large J's of three salts may be attributed to the superexchange interaction through the quinone-molecule.
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