Reacting with nickel(II) chloride, copper(II) chloride and bromide, thiophene-2,3-dicarboxaldehyde bis(oxime) (2,3BTCOH 2 ) leads to metal complexes formulated as [NiCl 2 (2,3BTCOH 2 )], [CuCl 2 (2,3BTCOH 2 )] and [CuBr(2,3BTCOH)] 2 respectively. In the case of nickel(II) bromide, we have observed the rearrangement of 2,3BTCOH 2 into 2-acetamido-3-thiophene carboxaldoxime (ACTOH) instead of the expected complex. The crystal structures of 2,3BTCOH 2 and ACTOH have been determined by X-ray diffraction methods and all other structures are proposed using usual spectroscopic techniques.