A numerical quantum transfer-matrix approach to S = 1 macroscopic chains wi
th single-site anisotropy and alternating bonds is worked out. A fit of the
experimental susceptibility data for a number of the bond-alternating quas
i-one-dimensional molecular magnets is performed down to the low-temperatur
e region. New microscopic parameters for the non-uniform antiferromagnetic
systems are established. (C) 1999 Elsevier Science B.V. All rights reserved
.