Cyclopalladated ethylenediamine complexes on the basis of 4-phenylpyrimidine and 4,6-diphenylpyrimidine
摘要:
Mono- and binuclear cyclopalladated complexes [Pd(ppm)En]C104, [Pd(Hdphpm)En]C104, and [(PdEn),)([t-dphpm)1Cl04 (ppm- is the deprotonated form ol'4-phenylpyridine, Hdphpm- and dphpm 2- are the mono- and bisdeprotonated forms of 4,6-diphenylpyrimidine, En is 1,2-diaminoethane) were prepared and characterized by means of 'H NMR and electronic absorption and emission spectroscopy, and cyclic voltammetry. It was shown that cyclopalladation leads to a bathochromic shift of intraligand absorption and phosphorescence bands, appearance of new absorption band associated with metal-to-ligand charge transfer, and an anodic potential shift of the ligand-centered electroreduction Hppm - H,dphpm < [Pd(ppm)En]+z [Pd(Hdphpm)Enl' < [(PdEn)2(p-dphpn-i)]21.
Cyclopalladated ethylenediamine complexes on the basis of 4-phenylpyrimidine and 4,6-diphenylpyrimidine
摘要:
Mono- and binuclear cyclopalladated complexes [Pd(ppm)En]C104, [Pd(Hdphpm)En]C104, and [(PdEn),)([t-dphpm)1Cl04 (ppm- is the deprotonated form ol'4-phenylpyridine, Hdphpm- and dphpm 2- are the mono- and bisdeprotonated forms of 4,6-diphenylpyrimidine, En is 1,2-diaminoethane) were prepared and characterized by means of 'H NMR and electronic absorption and emission spectroscopy, and cyclic voltammetry. It was shown that cyclopalladation leads to a bathochromic shift of intraligand absorption and phosphorescence bands, appearance of new absorption band associated with metal-to-ligand charge transfer, and an anodic potential shift of the ligand-centered electroreduction Hppm - H,dphpm < [Pd(ppm)En]+z [Pd(Hdphpm)Enl' < [(PdEn)2(p-dphpn-i)]21.