Preparation and Crystal Structure of Lead (II) Complex with Propane-1,2-Diamine

Abstract

The reaction of propane-1,2-diamine (pdam) with lead (II) nitrate in the ethanol solution led to the formation of a lead (II) complex, [Pb(NO3)(pdam)2]NO3 (1), with interesting coordination environment of the lead (II) ion. The compound was characterized by elemental analysis and IR spectroscopy and its crystal structure was determined by single crystal X-ray structural analysis. Lead (II) ion is coordinated by two neutral N,N′-bidentate propane-1,2-diamine ligands and by an O,O′-bidentate nitrate ion in a complex cation of 1. There is also an uncoordinated nitrate ion as counter-ion. The primary coordination sphere around lead (II) ion includes four N atoms (Pb–N, 2.377(4)–2.644(4) A). The effective coordination around lead (II) ion could be described as a highly distorted octahedron if the Pb···O contacts (Pb1···O4, 3.090(4) A, Pb1···O5, 3.177(3) A) are included. The coordination polyhedron is better described as a distorted pentagonal pyramid due to the presence of stereochemically active lead (II) ion lone pair of electrons in the axial position of the pyramid. Thus, the complex is hemidirected. Complex cations and nitrate counter-ions are connected into 3D structure by hydrogen bonds of the N–H···O type. Lead (II) complex with propane-1,2-diamine (pdam), [Pb (NO3) (pdam)2] NO3, was characterized by elemental analysis and IR spectroscopy and its crystal structure was determined by single crystal X-ray structural analysis.