Synthesis and structural characterization of dicopper(II) and dipalladium(II) complexes of 1,1,2,2-tetrakis(carboxamido-2-methylpyridyl)ethane

摘要: Abstract The binucleating ligand, 1,1,2,2-tetrakis(carboxamido-2-methylpyridyl)ethane (H4Lpy) was prepared. In neutral aqueous medium the H4Lpy binds two metal(II) ions and dinuclear complexes [Cu2(Lpy)(H2O)2]·10H2O (1) [Pd2(Lpy)]·4H2O (2) are formed. were structurally characterized by X-ray crystallography. crystallize in triclinic system with space group P 1 ¯ . 1: a = 8.829(2), b = 9.080(2), c = 12.414(3) A; α = 76.50(3), β = 79.12(3), γ = 87.25(3)°; V = 950.3(4) A3 Z = 1 2: a = 8.638(2), b = 10.009(2), c = 10.448(2) A; α = 78.03(3), β = 69.66(3), γ = 71.20(3)°; V = 797.2(3) A3 Z = 1. coordination polyhedron may be described as axially elongated square pyramid where Cu(II) centers coordinated four N atoms of Lpy tetraanion an O(3) atom aqua ligand. complex 2, each Pd(II) center displays a distorted planar geometry achieved N-donor Lpy. intra-dimeric M(1)⋯M(1A) distances 2 6.9680(17) 6.7345(18) A, respectively. Molecular mechanics (MM) calculations applied on to determine their molecular structures solid state. Fair agreement obtained between predicted MM (M⋯M 6.574 5.890 Ǻ for respectively) crystal structures.