Copper(II) Oligomeric Derivatives for Deposition of Copper Thin Films

Homobi-, -tri- and -tetranuclear copper(II) oligomeric complexes, [Cu(dmap)(OAc)(H2O)](2)center dot H2O (1), [Cu-3(dmae)(3)(acac)(2)-Cl] (2) and [Cu(dmae)(TFA)](4) (3), have been prepared by reacting Cu(OAc)(2)center dot H2O with dmapH, [Cu(dmae)Cl](4) with Na(acac) and Cu(dmae)(2) with Cu(TFA)(2) [dmae = (N,N-dimethylamino)ethanolate, dmap = (N, N-dimethylamino) propanolate, TFA = trifluoroacetate, and acac = 2,4-pentanedionate], respectively and characterized by melting point, elemental analysis, FT-IR and single-crystal X-ray diffraction. The crystal analysis shows that bi- (1) and trinuclear (2) com- plexes crystallize in the triclinic, while the tetranuclear complex 3 belongs to the monoclinic crystal system. TGA and AACVD experiments prove that the complexes undergo facile thermal decomposition in the temperature range 300-460 degrees C to deposit thin films of pure copper metal. The SEM and XRD analyses of the thin films suggest the formation of Cu crystallites with grain sizes of 100-340 nm (for 1), 75.4-90.8 nm (for 2 and 3). ((C) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)