Cyclo-ruthenated and -platinated complexes bearing phosphonate substituents

Two new, potentially cyclometalating terdentate ligands bearing phosphonate substituents, Et2O3P-N^C(H)^N (5) and Et2O3P-C(H)^N^N (7), have been prepared. The corresponding ruthenium complexes, [1]+ and [2]+, respectively, were obtained by reaction with [RuCl3(tpy)]. Complexes [1]+ and [2]+ display electronic properties characteristic for cyclometalated ruthenium complexes. The platinum complex [3], of N^C(H)^N ligand 5, was also prepared and is highly phosphorescent in solution. In general, the phosphonate group electronically behaves equivalent to a carboxylate moiety.

Graphical abstractTwo new, potentially either N,C,N′- or C,N,N′-cyclometalating ligands bearing a phosphonate moiety have been prepared. The electronic and photophysical properties of the corresponding ruthenium(II) and platinum(II) complexes are investigated.Figure optionsDownload full-size imageDownload as PowerPoint slide