1370656-41-9Relevant academic research and scientific papers
Platinum(II) diimine complexes with halide/pseudohalide ligands and dangling trialkylamine or ammonium groups
Chatterjee, Sayandev,Krause, Jeanette A.,Madduma-Liyanage, Kumudu,Connick, William B.
, p. 4572 - 4587 (2012)
A series of platinum(II) complexes with the formulas Pt(diimine)(pip 2NCNH2)(L)2+ [pip2NCNH 2+ = 2,6-bis(piperidiniummethyl)phenyl cation; L = Cl, Br, I, NCS, OCN, and NO2; diimine = 1,10-phenanthroline (phen), 5-nitro-1,10-phenanthroline (NO2phen), and 5,5′- ditrifluoromethyl-2,2′-bipyridine (dtfmbpy)] were prepared by the treatment of Pt(pip2NCN)Cl with a silver(I) salt followed by the addition of the diimine and halide/pseudohalide under acidic conditions. Crystallographic data as well as 1H NMR spectra establish that the metal center is bonded to a bidentate phenanthroline and a monodentate halide/pseudohalide. The pip2NCNH2+ ligand with protonated piperidyl groups is monodentate and bonded to the platinum through the phenyl ring. Structural and spectroscopic data indicate that the halide/pseudohalide group (L-) and the metal center in Pt(phen)(pip2NCNH2)(L)2+ behave as Bronsted bases, forming intramolecular NH...L/NH...Pt interactions involving the piperidinium groups. A close examination of the 10 structures reported here reveals linear correlations between N-H...Pt/L angles and H...Pt/L distances. In most cases, the N-H bond is directed toward the Pt-L bond, thereby giving the appearance that the proton bridges the Pt and L groups. In contrast to observations for Pt(tpy)(pip2NCN) + (tpy = 2,2′;6′,2″-terpyridine), the electrochemical oxidation of deprotonated adducts, Pt(diimine)(L)(pip 2NCN), is chemically and electrochemically irreversible.
