Pt (II) and Pd (II) compounds containing the free radical 4-aminoTEMPO (4amTEMPO) were synthesized and characterised by X-ray diffraction methods. The disubstituted complexes cis- and trans-Pt (4amTEMPO) 2I2 were studied. The trans isomer was prepared from the isomerisation of the cis analogue. The two Pd (II) compounds trans-Pd (4amTEMPO) 2X2 (X= Cl and I) were also characterised by crystallographic methods. A mixed-ligand ...