Abstract
The 35Cl NQR spin-lattice relaxation times T1Qin paramagnetic Mn(H2O)6SnCl6 andCo(H2O)6SnCl6 crystals were measured as a function oftemperature. Using the T1Q values observed, thecorrelation times τf of electron-spin flip-flops andexchange parameters J were estimated. The J value in Mn saltwas found to be smaller than those found for Co and Ni salts. It isinferred from the J values that the indirect interactionwhere some chemical bonds (including OH···Cl hydrogen bonds)intervene is dominant in the exchange interactions between theparamagnetic ions in M(II)(H2O)6SnCl6 (M(II) = Mn, Coand Ni).
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