Synthesis, Characterization, and Photochemical Properties of a New Square Mn(I)-Ru(II) Complex Using Pyrazine as Bridge Ligand

[摘要] The photochemical properties of the complexescis,fac-[Ru(phen)2(pz)2-Mn(CO)3Br]24+(I),cis-[Ru(phen)2(pz)2]2+(II), andfac-Mn(CO)3(pz)2Br (III) where phen is phenanthroline and pz is pyrazine in acetonitrile solution are reported. The three complexes were characterized using1H NMR, UV-vis and FTIR spectroscopy and electrochemical (cyclic voltammetry and spectroelectrochemical) techniques. The complexes show intense absorption in the visible region assigned to the population of MLCT excited states. The absorption spectrum ofIis the sum of the spectra of the mononuclear speciesIIandIII, and the two oxidation potentials at +1.10 and +1.56 V versus Ag/AGCl observed inIare ascribed to the different coordination environments of metal centers. The photolysis in the acetonitrile solution resulted in the pz dissociation to give the monoacetonitrile complexes forI,II, andIII, respectively.

[学科分类] 光谱学