Abstract: | Metal Complexes of Dyes. IX. Transition Metal Complexes of Curcumin and Derivatives The bidentate monoanions of curcuminCU, (1, 7-bis(4-hydroxy-3-methoxyphenyl)-hepta-1,6-diene-3,5-dione)], diacetylcurcuminDACU, (1,7-bis(4-acetyl-3-methoxyphenyl)-hepta-1,6-diene-3,5-dione)], dihydroxycurcuminDHCU, (1,7-bis(4-hydroxiphenyl)-hepta-1,6-diene-3,5-dione)], dimethylcurcumin DMCU, (1,7-bis(3,4-dimethoxyphenyl)-hepta-1, 6-diene-3,5-dione)] and trimethylcurcuminTMCU, (1,7-bis(3,4-dimethoxyphenyl)-4-methylhepta-1,6-diene-3,5-dione)] form with chloro bridged complexes (R3P)MCl2]2 (M?Pd, Pt; R?phenyl, n-butyl, ethyl, tolyl), η5-C5Me5)MCl2]2 (M?Rh, Ir), (η6-p-cymene)RuCl2]2, (η3-C3H5)PdCl]2, di-μ-chlorobisN-(diphenylmethylene)-glycinethylester-(C,N)]-dipalladium(II) and with (η5-C5Me5)Co(CO)I2] monochelate dye complexes. The structure of (η6-p-cymene)(Cl)Ru(DMCU)] was determined by X-ray diffraction. The dichelates (DMCU)2M with M?Cu, Ni, (CU)2Pd and the trichelate (CU)3Fe were obtained. Cationic bipyridine copper(II) complexes with CU, DHCU, and DMCU were sythesized by treating the dye ligands with copper(II) acetate, 2,2′-bipyridine and ammoniumtetrafluoroborate. In comparison to the free 1.3-diketones the dye complexes show a bathochromic shift in the UV/VIS spectra. |