view:21606 Last Update: 2019-1-30
Nader Noshiranzadeh, Ali Ramazani, Ali Morsali, Allen D. Hunter and Matthias Zeller|
4΄-(4-Pyridyl)-2,2΄:6΄,2΄΄-terpyridine As Ligand in the Lead(II) Complexes, [Pb(pyterpy)(MeOH)I2]•MeOH and [Pb(pyterpy)(μ-AcO)]2(ClO4)2
Two new lead(II) complexes with the ligand 4 0-(4-pyridyl)-2,20:60,200-terpyridine (pyterpy), [Pb(pyterpy)(MeOH)I2] Æ MeOH andl-AcO)]2(ClO4)2, have been synthesized and characterized by CHN elemental analysis, 1H NMR-, 13C NMR-, IR spectroscopy0-(4-pyridyl)-2,20:60,200-terpyridine (pyterpy)2] Æ MeOH and weak C–H N interactions for [Pb(pyterpy)(l-AcO)]2(ClO4)2, thus [Pb(pyterpy)( and structurally analyzed by X-ray single-crystal diffraction. The thermal stabilities of these compounds were studied by thermal gravimetric (TG) and differential thermal analyses (DTA). The single crystal X-ray analyses show that the coordination number in these complexes is six with three ‘‘pyterpy’’ N-donor atoms and two or three of the anionic ligands. The arrangement of donor atoms in these complexes suggest a gap or hole in the coordination geometry of the lead atoms, possibly occupied by a stereoactive lone pair of electrons on lead(II) and the coordination sphere is hemidirected. The potentially tetradentate ligand 4 acts as a tridentate donor to Pb(II). The noncoordinated pyridyl group interacts with hydrogen atoms of adjacent molecules and forms normal hydrogen bonds in [Pb(pyterpy)(MeOH)I extending the monomeric structures into one-dimensional networks.