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This work describes the synthesis, crystal structures and direct current (dc) magnetic properties of two air-stable oxamato-containing cobalt(II) complexes, [Co(H 2 edpba)(dmso) 2 ]·dmso·H 2 O ( 1 ) and [Co(H 2 edpba)(H 2 O) 2 ]n· n (dmso) ( 2 ) [H 4 edpba =  N , N ′-2,2′-ethylenediphenylenebis(oxamic acid); dmso = dimethylsulfoxide].  1  is a mononuclear compound, whereas  2  is a neutral chain. Cobalt(II) ions in both compounds are six-coordinate by six oxygen atoms, four of them from two monodeprotonated oxamate groups and the other two from dmso ( 1 )/water ( 2 ) molecules in  cis  ( 1 ) and  trans  ( 2 ) positions. Hydrogen bonds between monodeprotonated oxamate fragments of adjacent mononuclear units in  1  lead to a supramolecular chain growing along the crystallographic  c  axis. Hydrogen bonds involving coordinated water molecules and monodeprotonated oxamate fragments from adjacent chains in  2  result in a supramolecular 2D network. Cryomagnetic measurements reveal the occurrence of magnetically isolated high-spin cobalt(II) ions in agreement with the large values of the shortest intramolecular ( 1 )/intrachain ( 2 ) metal···metal separation [ ca.  10.3 ( 1 ) and 10.4 Å ( 2 )]. Simultaneous simulation of the  χMT  versus  T  and  M  against  H  data through the Griffith–Figgis Hamiltonian led to the best-fit parameters:  λ  = −141.1 ( 1 )/–174.8 cm −1  ( 2 ),  σ  = −1.45 ( 1 )/–1.25 ( 2 ) and  ν  = −121.42 ( 1 )/−247.29 cm −1  ( 2 ).

journal of coordination chemistry

X-ray structure and magnetic properties of a mononuclear complex and a 1D coordination polymer assembled by cobalt(II) ions and a flexible oxamate ligand