Abstract
We report the results of susceptibility and magnetization measurements on ferromagnetic-antiferromagnetic alternating chain compounds [Cu(TIM)]CuCl 4 (TIM=2,3,9,10-tetramethyl-1,3,8,10-tetraenecyclo-1,4,8,11-tetraazatetradecane) and (4-BzpipdH)CuCl 3 (4-BzpipdH=4-benzylpiperidinium). Magnetization curves of both compounds are compared to those calculated for an S =1 linear-chain Heisenberg antiferromagnet. From the fitting of susceptibility data to a numerical formula calculated for an S =1/2 ferromagnetic-antiferromagnetic alternating chain [Inog. Chem. 33 (1994) 5171], we have estimated the antiferromagnetic exchange constant J AF / k B =2.9 K, the ferromagnetic exchange constant | J F |/ k B =4.7 K and the g-value of the magnetic moment g =2.06 for the former and J AF / k B =8.8 K, | J F |/ k B =38.8 K and g =2.17 for the latter, which are different from the values reported previously.
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