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Reaction of 1,3-propanediamine with copper(II) perchlorate hexahydrate in basic solution in the presence of trimethyl orthoformate and  o -iodophenol serendipitously formed sodium [triformato-diperchlorato-di-1,3-propanediaminodicopper(II)], Na[Cu 2 (HCO 2 ) 3 (1,3-pn) 2 ](ClO 4 ) 2  ( 1 ). Single-crystal X-ray diffraction measurements show the compound to be a coordination polymer with the Cu(II) ions alternately bridged in μ 1,1 - and μ 1,3 -fashion by the formate ions. The sodium ions are coordinated to both formate ions and perchlorate ions in the lattice. Magnetic measurements were made over the range 1.8-310 K and show the presence of a singlet ground state at low temperature, the µ 1,1 -bridged copper ions being strongly antiferromagnetically coupled. The data were modeled equally well, within experimental error, by the alternating chain model and the dimer model with a Curie-Weiss correction for weak inter-dimer interactions, yielding C = 0.432(2) emu-K/mol-Oe,  J /k B  = −94.3(9) K and  J ’ = −2.4(1.5) K ().

A copper(II) coordination polymer of formate-bridged dimers: an alternating S = ½ antiferromagnetic chain