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Single-crystal x-ray structure determinations have been recorded at 295 K for the dithiocarbamate metal compounds [Co(Et₂dtc)₃], [Co(nPr₂dtc)₃], [Pd(iPr₂dtc)₂] and [Pd(Et₂dtc)₂]. The stability constants(K) in EtOH of dialkyldithiocarbamate metal complexes [M(R₂dtc)_n] (M=Co, Ni, Pd. R=Me, Et, iPr, nPr. n=2, 3. dtc=dithiocarbamate) are determined by UV-vis data. The stability of the metal complexes increases in the order: Co<Ni<Pd. The effects of alkyl groups on the stability of [M(R₂dtc)₂] (M=Ni and Pd) increase in the order: Me<Et<nPr<iPr, and [Co(R₂dtc)₃] decrease in the order: Et>iPr>nPr>Me. The results obtained from this study confirm that the stability due to alkyl groups may be partly attributed to changes in the residual positive charge and also partly to steric hindrance of branched alkyl-groups. The comparison between the solid and solution states shows that the [M(R₂dtc)₂] (M=Pd, Ni) complexes …