Abstract
Spin transition theory is developed for periodic chains with two and more exchange clusters in a unit cell. A general expression is obtained for the effective magnetic moment of a unit cell μeff with several exchange clusters. For heterospin complexes Cu(hfac)2LR characterized by chains with the head-to-head motif a twosite approximation for the statistical sum of the Cu2+ Jahn-Teller paramagnetic center Cu2+ with spin 1/2 is proposed, within which a comparison with the available experimental data is performed. It is shown that the model developed describes both smooth and abrupt (cooperative) spin-crossover cases for the chains of three-spin exchange clusters.
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