Novel copper(II) sulfonate-arsonates with discrete cluster, 1D chain and layered structures

Hydrothermal reactions of copper(II) salts with o-sulfophenylarsonic acid ( o-HO ₃S-C ₆H ₄-AsO ₃H ₂, H ₃L) led to a layered compound, Cu _2.5(L)(OH) ₂ ( 1). Introduction of the auxiliary chelating ligands such as 2,2'-bipyridine (bipy) or 1,10-phenanthroline (phen) and 2,2':6',2''-terpyridine (terpy) led to three new copper(II) sulfonate-arsonates with lower dimensional structures, namely, mononuclear Cu(HL)(bipy)(H ₂O)·2H ₂O ( 2), dinuclear [Cu(HL)(phen)] ₂·4H ₂O ( 3) and one-dimensional Cu(HL)(terpy)·2H ₂O ( 4). Magnetic property measurements indicate that 1 exhibits ordinary antiferromagnetic feature, without the geometric spin frustration as expected. 2 shows a typical paramagnetic behavior. There exists antiferromagnetic interactions between the magnetic centers in dimeric 3. 4 displays an antiferromagnetic magnetic exchange interaction propagated via O sbnd S sbnd O bridges.