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The quasi-one-dimensional molecule-based Heisenberg antiferromagnet Cu(NO 3 ) 2 (pyz) 3 has an intrachain coupling J = 13.7(1) K ( ) and exhibits a state of long-range magnetic order below T N = 0.105(1) K. The ratio of interchain to intrachain coupling is estimated to be | J ′/ J | = 3.3 × 10 −3 , demonstrating a high degree of isolation for the Cu chains.