METAL-COMPLEXES OF DYES .9. TRANSITION-ME TAL COMPLEXES OF CURCUMIN AND DERIVATIVES

The bidentate monoanions of curcumin[CU, (1, roxy-3-methoxyphenyl)-hep ta-1,6-diene-3,5-dione)], diacetylcurcumin[DACU, etyl-3-methoxyphenyl) -hepta-1,6-diene-3,5-dione)], dihydroxycurcumin[DHCU, -bis(4-hydroxiph enyl)-hepta-1,6-diene-3,5-dione)], dimethylcurcumin[DMCU, s(3,4-dimeth oxyphenyl)-hepta-1,6-diene-3,5-dione)] and trimethylcurcumin[TMCU, met hoxyphenyl)-4-methylhepta-1,6-diene-3,5-dione)] form with chloro bridg ed complexes [(R3P)MCl2](2) (M = Pd, Pt; R=phenyl, n-butyl, ethyl, tol yl), [(eta(5)-C5Me5)MCl2](2) (M = Ph, Ir), [(eta(6)-p-cymene)RuCl2](2) , [(eta(3)-C3H5)PdCl](2), methylene)-glycinethylester-(C,N)]-dipalladi um(II) and with [(eta(5)-C5Me5)Co(CO)I-2] monochelate dye complexes. T he structure of [(eta(6)-p-cymene)(Cl)Ru(DMCU)] was determined by X-ra y diffraction. The dichelates (DMCU)(2)M with M = Cu, Ni, (CU)(2)Pd an d the trichelate (CU)(3)Fe were obtained. Cationic bipyridine copper(I I) complexes with CU, DHCU, and DMCU were sy thesized by treating the dye ligands with copper(II) acetate, 2,2'-bipyridine and ammoniumtetra fluoroborate. In comparison to the free 1.3-diketones the dye complexe s show a bathochromic shift in the UV/VIS spectra.