The quasi-one-dimensional molecule-based Heisenberg antiferromagnet Cu(NO)(pyz) has an intrachain coupling J = 13.7(1) K () and exhibits a state of long-range magnetic order below T = 0.105(1) K. The ratio of interchain to intrachain coupling is estimated to be |J'/J| = 3.3 × 10, demonstrating a high degree of isolation for the Cu chains.
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